Masters Degrees (Biokinetics, Exercise and Leisure Sciences)

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Acute stress and strain due to backpack loading among primary school pupils.
(2011) Abrahams, Sumaya.; Ellapen, Terry Jeremy.; Van Heerden, H. J.
Schoolbag carriage represents a considerable daily occupational load for children (Negrini et al., 1999). Whittfield et al., (2001) and Puckree et al., (2004) have reported that the carriage of heavy schoolbags is a suspected aetiological factor of the daily physical stress of school pupils. Methods: One hundred and eighty-seven pupils voluntarily participated in a controlled, descriptive, epidemiological retrospective study. Subjects’ biographical, epidemiological, exercise history and lifestyle information was gathered by a self-report questionnaire (adapted from Puckree et al., 2004). Subjects’ body mass, stature and mass of their schoolbags were measured using a Detecto stadiometer scale. Digital images, electromyographical muscular activity and a posture profile assessments were captured in the frontal and sagittal planes whilst the pupils were in the loaded (carrying a schoolbag) and the unloaded phases (not carrying schoolbags). These images were analyzed using biomechanical software, Dartfish. The study being retrospective in nature recorded the prevalence of schoolbag carriage musculoskeletal pain over the last 12 months. Descriptive statistical tests such as mean, mode, frequency, percentages and inferential chi-square statistical test (set at a probability of 0.05) were employed to analyze the data. Results: The result indicated that 78.99% of the cohort experience musculoskeletal pain due to schoolbag carriage (p<0.0001). The most prevalent anatomical sites of pain were the shoulders (37.04%), neck (20.37%), lumbar (11.73%) and thorax (10.49%) (p<0.0001). The mean mass of the schoolbag carried by the cohort was 5.45kg which was approximately 11.5% of their body mass. The predisposing factors of the musculoskeletal pain were the methods employed to carry the schoolbag (single strap (20.21%) versus double straps (76.6%), altered posture due to excessive schoolbag mass together with a reduced craniovertebral angle (p<0.05). Discussion & Conclusion: The excessive schoolbag mass carried by the pupils placed strain on the immature vertebral column of these pupils thus causing postural deviations which induced musculoskeletal pain and discomfort.
Anthropometric characteristics and physiological performance variables of male and female junior hockey players in KwaZulu Natal.
(1997) Amra, Mohamed.
Anthropometric measures, physiological variables and skills tests were performed on subjects selected from the provincial KwaZulu Natai Junior Hockey teams in South Africa. The main purpose of this study was to establish a data base of norms for boy and girls in the UB, U14, U16, UI8 and the U2I age groups. The tests were done at the beginning and at the end of season. The anthropometric measures included height, weight, percentage body fat and lean body mass; physiological variables included sit-ups, push-ups, sit-and-reach (flexibility), broad jump, winder and bleep tests , and the skills tests comprised a wide range of ball skill tests. As expected, anthropometric changes were observed across the age groups, due to growth. Amongst the older age groups the girls had reached height and weight values comparable to elite female players , but only the boys in the U2I had reached their adult height and were slightly taller than the elite male players. There was no significant difference in the profile between the attack and defence players in the boys, but amongst the girls the defence players tended to be heavier and taller than the attack players. In the physiological and skills tests there was no difference between positional players. In the comparison between pre and end season to determine the effectiveness of the training programmes, there was a change in the anthropometric characteristics because of growth. However, the physiological and skill tests revealed no consistent pattern of improvement in the test results from pre season to end season. This study provides the first set of norms for male and female junior hockey players in South Africa. Further studies are required to expand upon and update the data in the current study.
Anthropometric characteristics, grip strength and physical activity levels of children with physical disabilities: a case study.
(2020) Dorfling, Micaela Ashley.; Naidoo, Rowena.; Chetty, Verusia.
Physical disability impedes the completion of daily functioning and tasks in children with disability often resulting in exclusion from participating in physical activity. The problem is that a lack of physical activity results in a higher risk of non-communicable lifestyle diseases, to which an individual with physical disability is already predisposed. The participation of children with disability in sports and recreational activities promotes inclusion, minimises deconditioning, optimises physical functioning, and enhances overall well-being. Despite these benefits, children with disability are more restricted in their participation, have lower levels of fitness, and have higher levels of obesity than their peers without disabilities. Therefore, the screening and monitoring of children using simple health indicators such as anthropometry, physical activity levels and grip strength is essential to identify children who may be at risk for chronic diseases, for those who can improve their quality of life through changes in their lifestyle; and it can help raise awareness of the need to increase their participation in physical activity. Often physical activity is underestimated for children with disability, well-informed decisions with regards to types and best suited physical activity programmes are more easily formulated following identification of overall health status and individual activity preferences, such as through measurement of physical activity levels, anthropometric characteristics and hand grip strength.
Association between physical fitness and job performance in South African fire-fighters.
(2012) Schmidt, Carl.; McKune, Andrew James.
Aim. Accurate correlations between a wide range of physical fitness measures and occupational demands are needed in order to identify specific fitness tests and training needs for firefighters. Methods. Forty-eight experienced, professional firefighters (29 ± 7.24 yrs) participated in fitness and job performance testing sessions each spaced a week apart. Analysis was performed using Pearson moment correlation coefficients and multiple linear regression with alpha set at p≤.05. Results. Significant correlations (p≤.01) were found between a job performance task (Revised Grinder) and the following: lean muscle mass (r = -.69), overall fitness (r = -.62), height (r = -.62), strength endurance: deadlift (r = -.54), bent-over row (r = -.51), bench press (r = -.51), shoulder press (r = -.46); maximal strength: hand grip strength (r = -.57), bench press (r = -.51), anaerobic capacity: 400m (r = .50), and aerobic capacity: multistage shuttle run (r = -.46). Multiple linear regression determined that lean muscle mass and aerobic capacity account for 82% of the variation in the job performance task. Conclusion. It is apparent that firefighting taxes virtually all aspects of physical fitness. This data can help the exercise specialist choose appropriate tests and prescribe specific fitness programmes for firefighters. Traditional firefighter exercise programmes focusing mainly on cardiovascular fitness should be replaced with physical conditioning programmes that address all components of fitness. Cardiovascular fitness testing should include the performance of job-related tasks to improve test validity.
Attitudes towards physical education in KwaZulu-Natal.
(1996) Thomson, Janet Elizabeth.; Andrews, Barry Craig.
This study investigated the attitudes towards Physical Education in KwaZulu and the determinants of those attitudes. The focus was on the teaching of the subject in schools and colleges of education in the KwaZulu Department of Education and Culture. The purpose of the study was to establish whether Physical Education was being limited by a lack of resources and/or the perceived low status of Physical Education. Questionnaires were developed for four different groups, namely, teachers, principals, college lecturers and the pupils and students themselves. The analysis of the responses indicated that all four groups held strong beliefs about the benefits of the subject. The benefits which the pupils regarded as the most positive were in the areas of physical fitness and social development. In contrast to their western counterparts, pupils and students did not view Physical Education as a "light relief' subject nor did they regard enjoyment as a requisite. Negative determinants of attitude were found to be related primarily to the lack of facilities and the consequent lack of diversity in the Physical Education curriculum. Respondents from the teachers' and principals' groups revealed that the teaching of Physical Education in KwaZulu was important but severely inhibited by a combination of factors. Allocation of resources in the form of physical facilities and equipment was found to be deficient. There was an absence of qualified staff, which resulted in the subject either being omitted from the curriculum or being taught by teachers with no knowledge of its objectives nor of the correct teaching methods. In some cases the subject was confused with sport and coaching school teams and in most cases the subject played a subservient role to that of examination subjects. The promotion prospects of the Physical Education teachers were not perceived to be limited compared to their academic counterparts because all of them were teaching academic subjects. Those with specialised training in Physical Education were not in evidence because they were not teaching Physical Education. College lecturers were specialist trained and indicated a much greater degree of success in the implementation of Physical Education programmes. Colleges had superior facilities and equipment although insufficient use of funds was apparent. College lecturers did not feel that they successfully achieved the educational objectives of the subject. In agreement with their western counterparts, they perceived their promotion prospects to be limited. The failure to implement successful programmes of Physical Education in the schools led to the recommendation that preservice specialised training was vitally important but not sufficient and that in-service courses in the form of practical workshops for staff and principals were essential in order to support the preservice initiatives.
A comparison of the fitness levels of Indian high school boys in two cohorts : 1977 and 1997.
(2000) Naidoo, Krishnaveni.; Coopoo, Yoganathan.
The main aim of this study was to compare fitness levels of Indian high school boys in two cohorts: 1977 and 1997. A secondary aim was to identify if the same problem areas or strengths still exist in 1997 as in 1977 or if the levels of fitness have further deteriorated or improved, as well as the establishment of norms for boys 14 - 18 years. Ten different Secondary schools from the Durban Metropolitan area participated in this study. The test battery included eight tests measuring four components of motor fitness based on the Fleishman study. The tests that were used consisted of fifty metre shuttle run, fifty metre dash, sit-ups, pull-ups, medicine ball put, shot-put, 250m shuttle run and 12 minute run/walk test. Data from 500 hundred boys were included in the research analysis and these were categorized into 5 different age groups, 13,6 - 14,6 years; 14,7 - 15,6 years; 15,7 - 16,6 years; 16,7 - 17,6 years and 17,7 - 18,6 years. Basic statistical procedures were used to determine the normality of the samples for height and weight in each age group. Standard score tables were drawn for each age group. A paired t-test was used to determine if a significant difference between the means existed. The level of significance was set at 0,05. The means of both studies were compared to ascertain the difference in fitness levels in the two cohorts. The analysis of the data revealed that the fitness status of adolescent boys have deteriorated over two decades.
A Comparison of upper and lower limb exercise in canoeists using the heart rate and oxygen consumption relationship
(2003) Gomes, Adrian Neil.; Mars, Maurice.
The heart rate achieved with maximal upper limb exercise is quoted as being on average thirteen beats per minute lower than when performing maximal leg exercise. Many canoeists use heart rate monitors during training and seek advice on setting their heart rate training zones. Existing guidelines are based on lower limb-derived heart rates, which may not be appropriate. As canoeists use predominantly their upper limbs during canoeing, it was hypothesized that as their upper limbs are trained, they may achieve heart rates and oxygen consumption similar to those achieved with lower limb exercise. The purpose of this investigation was to compare the relationship between heart rate and oxygen consumption when exercising on either a kayak ergometer or treadmill. Fifteen volunteer canoeists, who compete regularly, were recruited by convenience, purposive sampling and randomly allocated to a V02max test using open circuit spirometry, on either a kayak ergometer or treadmill. They returned within 5 to 7 days for a V02max test on the other apparatus. Their heart rates were also measured during these activities. The heart rate oxygen consumption relationship for upper and lower limb exercise was then analysed. Maximum heart rate was on average only 6 beats per minute lower with upper limb exercise, with some subjects achieving the same or very similar HRmax; the median difference in heart rate maximum was only 4 beats per minute. Although the response of heart rate and oxygen consumption to kayaking and running was similar at any given workload, the heart rate on the kayak was about 8 beats per minute higher at any submaximal workload. V02max. on the kayak was lower than on the treadmill. At any metabolic equivalent, the tidal volume was lower on the kayak and there was a lower respiratory rate on the treadmill. At any tidal volume, the metabolic equivalent was lower on the kayak ergometer. The minute volume on the kayak was higher than on the treadmill, for all but the highest intensities of exercise. Using the leg heart rate max to determine the training zones, a slightly higher (negligible) percentage of arm V0max is achieved at any given percentage heart rate. Kayakers who train regularly, appear to be able to attain similar maximum heart rates with upper and lower limb exercise, but a lower V02max when exercising with their arms. The heart rate oxygen consumption response is the same for upper and lower body exercise; and a reduced HRmax and increased heart rate at any sub maximal workload do not appear to apply to canoeists. It is therefore concluded that heart rate training zones based on leg HRmax are suitable for kayak training. This study has helped distinguish the difference between the heart rates of the upper and lower limbs at any given oxygen consumption in canoeists. The benefits of performing this study have also been to provide better advice to canoeists on how to train using heart rate monitors.
An economic impact analysis of the Comrades Marathon on the city of Durban.
(2009) Maharajh, Ashok.; Coopoo, Yoganathan.
Sport has become a major industry as well as a key cultural preoccupation in contemporary society. Cities are increasingly using major sporting events and activities to re-image themselves, promote urban development and fund economic growth and regeneration. Major sport events are often recognised for their ability to generate significant economic benefits for the host destination. The major difference between this study and other economic impact studies is that the event is tracked over a two-year period. This afforded the author the opportunity to compare and note the variations in the data over the two years. Initially, the study purports to analyse the economic impact of the Comrades Marathon on the City of Durban. A secondary objective is to demonstrate the value of such a major sporting event to the regional and provincial governments as well as the formal and informal businesses in the city. Durban like other key cities in the world is and will increasingly be confronted by two main and related challenges. Firstly, there is need to successfully compete in a universal economy characterised by increased competition and globalization. Secondly, there is need to eliminate poverty and address issues of inequality and marginalization. Thus, the Comrades Marathon, as a major sporting event, can be seen as a primary driver to create jobs and contribute to competitiveness. As stated the research was conducted over two years viz. 2004 and 2005 thus representing an "up" and a "down" run. The questionnaire method and interviews were employed for this study and were administered to accommodate the alternate runs. The questionnaire requested data on the age, gender, occupations, income levels, spending patterns and the types of activities that the population found attractive. The population consisted of foreign runners and supporters, runners and supporters that reside in other provinces of South Africa, stall holders at the Comrades Expo that is normally held over three days prior to the race, representatives of the sponsors of the event and vendors. The sample was selected randomly from the population. Face-to-face interviews were conducted with representatives from the hotel industry in Durban, the Acting-Chief Executive Officer and committee members of the Comrades Marathon Association and the Marketing Managers/Public Relations Officers of three major shopping malls located in Durban. Turco, Swart, Bob and Moodley (2003) reported that the leverage ratio that is public sector input against private sector response indicated that the 2001 Comrades Marathon together with other major sporting events held in the city were successful and contributed significantly to the Durban economy. The leverage ratio is illustrative of the amount of money that was accrued to the private sector with every Rand spend by the public sector. Consideration was given to the total revenue generated by peoples' average spending at the events and the total amount accruing to the accommodation industry. Cognisance must be taken that the leverage ratio does not consider overall spending in Durban as well as other general multipliers such as revenue generated from transport, other financial transactions, product suppliers, guided tours, established businesses and informal traders. The findings showed that the leverage ratio for 2004 was computed to be 1:216.38 that is for every Rand spent by the public sector on the event R216.38 was generated by the private sector. In addition, the leverage ratio for 2005 was computed to be 1:434.49 that is for every Rand spend by the public sector on the event R434.49 was generated by the private sector. Thus, the expenditure was considerably higher in 2005 with an upsurge of R31 819 272 that is an increase of 33%. The fundamental idea behind the economic impact of sporting events is that it injects a significant increase in the demand of goods and services into the economy. This effect is not simply the direct effect of consumer spending but also the indirect effects caused by the stimulus to the economic activities induced by the direct effects.
The effect of a sport stacking intervention programme on fine and gross motor skills in preschool children.
(2017) Daya, Bhavik.; Naidoo, Rowena.
Introduction The lack of physical activity among children is alarming and has become a major health concern as children are not engaging in enough physical activity to assist in the growth and development of the child. The development of motor skills in children plays an important role in the level of physical activity children engage in. If a child cannot efficiently run, kick, jump, catch, etc., then the opportunities to participate in sport and other physical activities will become limited because they will not have the necessary skills to do so. Fine motor skills are just as important as gross motor skills and are necessary for the development of basic self-help skills. Activities like sport stacking is believed to improve hand eye coordination, reaction time and motor proficiency. Aim The aim of this study was to investigate the effects of a five-week sport stacking intervention programme on fine and gross motor skills in preschool children. Methods The study was a quasi-experimental non-equivalent controls design with a pre- and postintervention assessment. The sample selection was a convenient sample of 40 participants between the ages of four and six years. The Bruininks-Oseretsky Test of Motor Proficiency, second edition (BOT-2) was used to assess fine and gross motor skills. The data collected in this study was subjected to various statistical procedures. All the data was analysed by a computerised statistical procedure (SPSS Version 19) and descriptive (means and standard deviations) and inferential (paired t-tests and independent t-tests) statistics were used to test significant differences pre- and post- intervention with p ≤ 0.05. Results Results demonstrated that the intervention group significantly improved in several fine and gross motor areas. Paired samples t-test for the intervention group showed significant differences for five items assessed (copying a star, transfer of pennies, dribbling a ball – alternating hands, sit-ups and one legged stationary hop). Independent samples t-test showed significant differences for transfer of pennies and dribbling a ball - alternating hands. Analysis of covariance showed significant differences in copying a star, transfer of pennies, tapping feet and fingers – same side synchronised, dribbling a ball – alternating hands and one-legged stationary hop. Conclusion A sport stacking intervention programme is a suitable method to improve fine and gross motor skills in preschool children.
The effect of an anti-inflammatory homeopathic product on cytokine status in venous blood following 90 minutes of downhill running.
(2008) Docrat, Aadil.; Peters-Futre, Edith Margret.
Background: Downhill running involves eccentric contractions of the gluteal, quadriceps, hamstring and calf muscles and the lengthening of muscle fibres as they contract. Several studies have demonstrated that this type of prolonged eccentrically biased exercise induces tissue damage and subsequent enhancement of an inflammatory response. Traumeel® S (Heel GmbH, Baden-Baden, Germany) is a homeopathic-complex used to treat trauma and inflammatory processes that is sold as an over the counter remedy in pharmacies. Although the antiinflammatory and analgesic effects of Traumeel® S have been demonstrated in selected clinical trials as well as in in vitro experimental models, little is known of its scientific mechanisms of action. Aim: The aim of this study was to establish whether administration of Traumeel® S five days before and three days after a 90-minute downhill treadmill run at 75% V02 peak significantly changes systemic markers of the inflammatory response. These are to include blood-borne concentrations of Cortisol and examples of selected T-helperrcell cytokines, T-helper2-cell cytokines, chemokines and pro-inflammatory cytokines during the three days following the 90-minute downhill run. Method: This study was designed as a double-blinded, placebo-controlled clinical trial in which matched subjects were randomised to Traumeel (TRAU) and Placebo (PLAC) pairs and exposed to two 90-minute downhill running trials. Twenty subjects (12 men, 8 women) aged between 20 and 50 years, fully complied with all inclusion criteria set for the study. Following baseline laboratory and field testing, they were matched according to gender, body mass index (BMI), training age, training status, peak running performance and foot-strike patterns and randomized into TRAU and PLAC groups. One Traumeel® S tablet was ingested three times per day for five days prior to and three days following a 90-minute downhill run on a treadmill at a -6% gradient and at a speed eliciting 75% V02 peak on a level gradient. Blood samples were obtained immediately before the 90-minute trial (PRE), immediately after the trial (IPE) and 24 hours (24 PE), 48 hours (48 PE) and 72 hours (72 PE) following the trial. Each subject was also requested to complete a training record prior to the trial and keep a record of the daily symptoms of delayed onset muscle soreness (DOMS) both at rest (general pain) and while walking (daily living). Full blood counts, serum creatine kinase (CK) and Cortisol concentrations were determined using standard haematological laboratory procedures. A sandwich ELISA was used to determine plasma interleukin-6 (IL-6) concentrations. A commercial bead-array kit was used to conduct flow cytometric analysis of Interleukin-8 (IL-8), Interleukin-10 (IL-10), Tumour Necrosis Factor alpha (TNFa), and Interleukin-12p70 (IL-12p70) concentrations. Results: Paired student Mests indicate that the mean ± SEM of the two groups was not significantly different (p < 0.05) in terms of age, BMI, percentage body fat, training age, foot strike patterns, running performance, FVC, FEV1; baseline heart rate and blood pressure, RERmax, V02 peak, VEmax, or training status. Although the TRAU group completed the 90-minute downhill running trial at a significantly faster speed (13.3 ± 2.1 vs. 12.8 ±0.3 km.hr; p = 0.02) and covered a greater distance (20.1 ± 0.3 vs. 19.34 ± 0.4; p = 0.03), mean and maximum heart rate and RPE did not differ between trials in the TRAU and PLAC groups. The downhill running protocol resulted in significant increases in neutrophil counts and creatine kinase, Cortisol, IL-6, IL-8 and IL-10 concentrations in the circulation (n = 20; p < 0.001). When comparing the TRAU (n = 10) and PLAC (n = 10) groups, blood neutrophil counts, creatine kinase, Cortisol, and IL-6 concentrations over the 5 time points and PRE, IPE and 24 PE plasma TNF, IL-8, EL-10 and EL-12p70 concentrations did not differ significantly (p > 0.05). Blood creatine kinase was, however, significantly higher in the TRAU group at 24PE (p < 0.05). The post-trial DOMS scores reported by the TRAU group over the 3-day post-exercise recovery period were also significantly lower in the TRAU group at 24PE (p = 0.03). Conclusion: Despite a faster running speed and higher post trial CK concentration in the TRAU group following the 90-minute downhill run, statistically significant differences in circulating stress hormone, and cytokine concentrations (IL-6, IL-8, IL-10, TNFa and IL-12p70) between the TRAU and PLAC groups, were not identified. Delayed onset muscle soreness was also significantly lower in the TRAU group at 24 hours post trial (p = 0.03). While these findings would support attenuation of the post-exercise inflammatory response by Traumeel® S, further work is required to verify this possibility.
The effect of an anti-inflammatory homeopathic product on systemic markers of inflammation following 90 minutes of downhill running.
(2008) Smith, Megan.; Peters-Futre, Edith Margret.
Background: The homeopathic preparation, Traumeel S, has been used as a valuable alternative to conventional non-steroidal anti-inflammatory drugs (NSAIDS) for over 30 years. This antihomotoxic, anti-phlogistic drug has been widely used by sportsmen and women in the treatment of lesions and inflammatory processes which result from exercise-induced skeletal muscle microtrauma. Although numerous randomised, double-blind placebo-controlled trials have confirmed the efficacy of Traumeel S as an anti-inflammatory agent, there are few in vivo studies which have specifically investigated the mechanism by which Traumeel S is effective in reducing inflammatory response to exercise-induced muscle cell damage. Aim: To establish whether the administration of Traumeel S during the five days before participation and three days following participation, significantly attenuates the systemic markers of the inflammatory response, following a 90-minute downhill running trial. Method: Twenty-four healthy athletes (14 men and 10 women), aged 20-50 years, were recruited for this study. Following baseline laboratory testing and familiarisation with the treadmill as well as a field test, subjects were matched according to gender, BMI, training age, training status, peak performance and foot strike patterns and randomised into Traumeel (TRS) and Control (PLAC) groups in a placebo-controlled, double-blind design. One Traumeel S or Placebo tablet was ingested three times per day for five days prior to and three days following a 90-minute exercise trial on a downhill (-6% gradient) at 75% V02 max- Blood samples were collected prior to the 90-minute trial (PRE), immediately after the trial (IPE) and 24 hours (24 PE), 48 hours (48 PE) and 72 hours (72 PE) following the trial. Each subject was also requested to complete a training record prior to the trial and keep a record of the daily symptoms of delayed onset muscle soreness (DOMS) both at rest (general pain) and during walking (daily living). Full blood counts (FBC), serum creatine kinase (CK), lactate dehydrogenase (LDH) and Cortisol concentrations were measured using standard haematological laboratory procedures and serum C-Reactive Protein (CRP) was determined by immunoturbidimetric assay. Sandwich ELISA's were used to determine myeloperoxidase (MPO) and plasma interleukin-6 (IL-6) concentrations. All results obtained were adjusted for changes in plasma volume as calculated from the red blood cell indices. Results: Mean ± SD characteristics of the gender-matched subjects in the experimental (TRS) and placebo-control (PLAC) groups did not differ significantly in terms of BMI, age, % body fat, FVC, FEVi, training age and status, foot strike pattern or peak running performance, maximal Heart Rate, VE, V02peak> RER, RPE during the maximal exercise test (p > 0.05). This indicated that the randomised pairs were well matched. The 90-minute downhill running protocol resulted in significant elevations in total circulating white blood cell count (WBC), neutrophil, CK, LDH, Cortisol, CPR, MPO and IL-6 concentrations (p < 0.001). When comparing the TRS and PLAC groups, mean ± SD total and differential WBC count, neutrophil count, CK, LDH, Cortisol, CPR, MPO and IL-6 concentrations did not differ (p > 0.05) over the 5 time points. At 24 PE, MPO concentrations were significantly higher in the TRS group than in the PLAC group (p = 0.03). The lower mean ± SD post-trial DOMS scores reported by the TRS group were not significantly different from those reported by the PLAC group (p > 0.05). Conclusion: Although the findings of this study did not identify differences in circulating CK, LDH, Cortisol, CPR and IL-6 concentrations between the TRS and PLAC groups, the elevated MPO concentration at 24 PE did provide preliminary novel evidence of enhanced activation of neutrophil oxidative burst activity following exercise-induced muscle damage which is hypothesized to accelerate the recovery process.
The Effect of exhaustive exercise on lymphocyte apoptosis.
(2001) Chetty, Ananthan.
Post exercise lymphocytopenia is a well documented phenomenon. Studies have reported exercise induced DNA damage in leucocytes and have postulated a possible link to apoptosis. Five subjects of differing fitness levels underwent a ramped treadmill test to exhaustion. Venous sampling was undertaken before, immediately post exercise, and 24 and 48 hours after exercise. Single cell gel electrophoresis showed evidence of single strand DNA breaks (as evidenced by an increase in tail moment measurements using the comet assay) in 100% oflymphocytes immediately after exercise, and in the 24 hour and 48 hour post exercise samples. Flowcytometric analysis oflymphocytes revealed a minimal amount of both apoptosis and necrosis at all time intervals. Lymphocyte apoptosis has again been demonstrated after exercise, however the percentage of apoptosis was a maximum of 4.8% at 24 hours. These findings may in part account for the exercise induced lymphocytopenia and reduced immunity demonstrated by numerous previous other studies.
Effect of group exercise on anthropometry, nutritional status and health related quality of life of older persons living in aged care homes within the eThekwini Municipality.
(2014) Rugbeer, Nivash.; Ramklass, Serela Samita.; Van Heerden, H. J.
Introduction: Globally, the prevalence of chronic disease is on the increase with cardiovascular disease being the leading cause of death. Worldwide the proportion of older persons aged 60 years and older is also increasing. The elderly within institutionalised setting are often neglected, with the probability of poor nutrition being highly prevalent. Increasing in age and visceral fat coupled with a lack of structured exercise results in inflammatory and pro-inflammatory processes, contributing to the deterioration of physical and physiological functioning. In the context of the elderly living in aged care homes, health related quality of life is defined as their functional status and independence in engaging in activities of daily living. Little is known about the effect of group based exercise and its relation to anthropometry, nutritional status and health related quality of life among the elderly living in aged care homes within the eThekwini central business district (CBD). Aim: The aim of the study was to establish the effect of group exercises in relation to anthropometry, nutritional status and health related quality of life of older persons living in age care homes in the eThekwini central business district. Methodology: A quasi-experimental design was used to compare the effect of a 12 week group exercise programme on two groups of participants using pre-test and post-test procedures. A total of 100 participants selected from five aged care homes. Twenty participants from each of the five facilities were randomly selected through convenient sampling. From the 20 participants, ten participants were randomly assigned to Group A –experimental group and 10 in Group Bobserved group. Group A exercise three times a week and group B exercise two times a week for 12 weeks. Group based 12 weeks exercise intervention was implemented for both groups. Anthropometrical indices investigated included sum of skinfold, waist circumference, waist to hip ratio and BMI. MNA-SF, SF-36 questionnaires were used before and after the exercise intervention to determine nutritional status and health related quality of life respectively. Data was analysed using the Statistical Package for Social Science Version 18.0 (SPSS) for Windows software. A p-value of <0.05 was considered statistically significant. A paired t-test and independent t-test was used to analyse parametric data. Wilcoxon signed rank test and Mann Whitney U test was used to analyse normally distributed and non-parametric data. Results/Discussion: An inverse relation between 12 weeks of group exercise and sum of skinfold was noted comparing before (M: 141.05 mm, SD: ±37.43mm) and following (M: 153.66 mm, SD: ±46.59mm) group exercise (p<0.01). However this cannot be attributed to group exercise independently, but as a result of the inherent inverse relationship that exists between fat free mass and age. Group exercise when compared to baseline (M: 12.96, SD: ±1.48) and follow up (M: 13.02, SD: ±1.11) was effective in improving nutritional status (p<0.01). Group exercise improved components of HRQoL. Participation in vigorous activities had improved following the group exercise intervention (p<0.01). Exercise was effective in reducing a feeling of worn out (p=0.01), improving social functioning (p<0.01), improved feeling of peace (p<0.01), happiness (p<0.01), change in reported health (p<0.01), mental health (p=0.03) and vitality (p=0.01). There was a significant difference in social functioning (p<0.01), vitality (p<0.01) and mental health (p=0.03) comparing before and following training thrice a week. Group exercise twice a week may improve social functioning (p=0.02). There was a significant difference in mental component summary following 12 weeks of group exercise (p<0.01). There was a significant difference in physical component summary scale (p=0.03) and mental component summary (p=0.04) comparing before and following training twice a week. A significant difference was evident in the mental component summary scale comparing before and following training thrice a week (p<0.01). Conclusion: Group exercise significantly improved nutritional status and health related quality of life of the elderly living in aged care homes. Group exercise performed three times a week may improve social functioning, vitality and mental health whilst exercising two times per week may improve social functioning. This may assist the elderly in accomplishing activities of daily living safely, improving their functional ability and quality of life.
The effect of therapeutic horseback riding on heart rate variability of children with disabilities.
(2015) Nqena, Zingisa Zine.; Naidoo, Rowena.
Introduction: Heart rate variability (HRV) is the oscillation in the interval between consecutive heart beats, resulting from dynamic interplay between multiple physiologic mechanisms that regulate instantaneous heart rate. Short-term heart rate regulation is governed by sympathetic and parasympathetic neural activity and therefore HRV examination can be used as a non-invasive estimate of the functioning of the autonomic nervous system (ANS). Aim: To determine the effects of therapeutic horseback riding (THR) intervention on the HRV of children with disabilities including autism spectrum disorder, cerebral palsy, pervasive developmental disorder, sensory problems, and Down syndrome. The objective was to examine if THR intervention improves the HRV of children, hence improving the parasympathetic activity that is associated with a calm and relaxed state. Methods: This is a quasi-experimental design. Heart rate variability components (time and frequency domain) were measured over six intervention group sessions of THR which were conducted once a week for six weeks. The duration of the THR sessions was 20-25 minutes for each group. The THR sessions included riding, mounting and dismounting, trotting, as well as performing activities such as extending arms and throwing a ball while on a horse. Heart rate variability measures were recorded from 29 participants presenting with various disabilities, and was assessed in both time and frequency domains. Results: Over the six THR sessions, the time domain component (RR interval) showed a significant increase in HRV for pre-THR from session one to session six (p=0.011), indicating improved vagal activation. However, frequency domain showed both increased sympathetic activity from session one to session six (p=0.022) reflected by component coefficient of variance for low frequency (CCV LF) and increased parasympathetic activation during THR from session four to session six (p=0.045), reflected by total power (TP). Conclusion: Therapeutic horseback riding intervention of six sessions demonstrated a change in HRV of children with disabilities. However, the changes obtained were not significant to make conclusive measures as to whether sympathetic or parasympathetic activity is predominantly increased after the six sessions. Further research involving a larger sample with a single type of a disability would be recommended to improve the reliability and validity of the study. Furthermore, having a control group would improve the reliability of the study.
Effects of a resistance exercise intervention programme on body composition, chronic disease risks and strength scores in people living with HIV and Aids (PLWHA) receiving antiretroviral therapy (ART) in Zimbabwe.
(2017) Mbayo, Victor.; Sookan, Takshita.
Introduction People living with HIV and AIDS (PLWHA) receiving antiretroviral therapy (ART) increases their life expectancy. Receiving ART coupled with physical inactivity results in increase in prevalence of hyperlipidaemia, obesity and overweight, type 2 diabetes mellitus, lipodystrophy, decrease in mineral bone density and hypertension among others. Resistance exercise (RE) interventions address chronic disease risks affecting PLWHA receiving ART. Aim The study investigated the effect of RE on body composition, chronic disease risks and strength scores in PLWHA receiving ART. Methods The study followed an experimental, pre-and-post-test design. The sample constituted 128 PLWHA, of black African ethnic groups, aged between 18-45 years and receiving ART. The participants were recruited from Glenview and Mabvuku suburbs in Harare. The participants from Glenview were randomly allocated to an experimental group i.e. the EXP group (n=64) performing REs three days per week and those from Mabvuku to a control group i.e. the CON group (n=64) for 12 weeks following a pre-test session. Body composition (waist-to-hip ratio, body mass index, percentage body fat, fat mass, lean body mass), chronic disease risks (fasting blood glucose, fasting total blood cholesterol, blood pressure) and strength (1RM tests) scores were pre-and-post-test measured in all participants observing standard protocols. Chi-square, Fisher’s test, linear regression, Binomial test, Spearman’s and Pearson’s correlations were conducted. SPSS statistical package version 22 was used and significance set at p<0.05. Results Post-test body composition scores remained high in the CON group (n=64), but improved significantly (p<.0005) in the EXP group (n=64). Significant differences (p<.0005) were noted in post-test chronic disease risks between the EXP group (n=64) and the CON group (n=64). Post-test fasting blood glucose and fasting total blood cholesterol scores in the CON group (n=64) were significantly higher (p<.0005) than in the EXP group (n=64). A 100% of the CON group (n=64) participants remained with pre-hypertension at post-test, while 66% of the EXP group (n=64) with hypertension 2 improved to hypertension 1. Strength scores in the EXP group (n=64) participants significantly increased (p<.0005) for bench press, squat, bicep curl and leg curls than in the CON group (n=64). There were no effects of gender in respect of fasting blood glucose and total fasting blood cholesterol scores in both groups at post-test. Conclusion The results showed that the 12 week RE intervention programme improved body composition, chronic disease risk and strength scores in PLWHA receiving ART. Resistance exercise is safe and beneficial for PLWHA in resource-constrained settings. Policy makers may utilise this information to include RE programmes for PLWHA as a healthy lifestyle intervention in Zimbabwe. Keywords HIV, ART, Chronic disease risks, Resistance exercise, Body composition, Strength.
The effects of a structured group exercise program on functional fitness of older persons living in old age homes within the eThekwini Municipality, South Africa.
(2014) Chetty, Levin.; Ramklass, Serela Samita.; McKune, Andrew James.
Aim: The study aimed to determine the effects of a structured group exercise program on functional fitness of older persons living in five old age homes within the eThekwini Municipality of South Africa. Population: The study population comprised men and women aged 60 years and older, who reside in an old age home within the eThekwini Municipality. Design: A quasi-experimental design was used to compare the effect of a 12 week group exercise program on two groups of participants using pre-test post-test procedures. Methodology: Twenty participants each were selected from five old age homes. Participants were randomly allocated into either an experimental group or a comparison group at each site. The experimental group participated in the exercise intervention three times weekly for 12 weeks, while the comparison group received the same intervention twice weekly for 12 weeks. The prescribed intervention was guided by the recommendations outlined by the American College of Sports Medicine (ACSM) and American Heart Association (AHA) respectively. It comprised of warm-up, balance, endurance, resistance and cool-down components. Assessments of upper and lower body strength and flexibility, aerobic endurance, agility and balance were conducted before and after the intervention using the Senior Functional Fitness Test. Data was analysed using Microsoft Excel 2013 and Statistical Package for Social Sciences version 20.1. Results: Comparisons of baseline and post-intervention measures showed greater improvements in upper and lower body strength and flexibility, as well as aerobic endurance capacity (p < 0.05). But, no improvements were observed in participant’s agility and balance levels. With regards to training frequency, no significant difference in functional fitness measures was observed between both groups following the 12 week intervention program. Conclusion: Twelve weeks of multifaceted group exercise training, at least two times per week can be used as an effective strategy to promote functional fitness in the elderly population.
The effects of exercise on the aged.
(2002) Ellapen, Terry Jeremy.; Coopoo, Yoganathan.; Ramiah, Pramila Devi.
This study aimed to document the effects of regular exercise and physical activity on the aged. Subjects (n=S8) over the age of sixty-five participated in the study. All subjects were patrons from various retirement centers of the DAFTA organization (Durban Association for the Aged). The subjects completed a PAR-Q and informed consent form, which allowed the eligible to participate in the study. A pre and post-test battery was administered to measure the following parameters; body mass, height, girth measurement, agility and dynamic balance, muscle strength and endurance, flexibility, co-ordination, dynamic grip strength and aerobic capacity. During the experimental period the subjects engaged in a structured intervention exercise programme of 30 weeks. The intervention programme composed of games, walking, stretching, flexibility and resistance training exercises aimed at improving the following fitness components; agility and dynamic balance, strength, flexibility, co-ordination and aerobic capacity. Inferential and differential statistical methods were employed in order to analyzethe data. The study indicated that regular exercise and physical activity positively impacted the senior citizens' functional capacity and improved their quality of life (p
Effects of group exercise on salivary biomarkers of mucosal immunity and hypothalamic-pituitary adrenal axis activation in older persons living in aged care facilities.
(2015) Dudhrajh, Prathna Abhimun.; McKune, Andrew James.; Ramklass, Serela Samita.
Abstract available in PDF file.
The effects of high intensity exercise on lymphocyte DNA and antioxidant status in trained athletes.
(1998) Govender, Sumentheran Nadarajan.; Chuturgoon, Anil Amichund.; Mars, Maurice.
Apoptosis (programmed cell death) and exercise immunology have been the focus of research for the past five years. Trained athletes are particularly susceptible to a wide variety of viral and bacterial infections and this has been related to oxidative damage which is a mediator of apoptosis. Apoptosis, a normal physiological mechanism has also been implicated in the pathogenesis of a wide-variety of diseases. To date, the link between apoptosis and exercise has not been shown by established methods or ultrastructurally. The objective of the study was t.o determine the effects of a single bout of high intensity exercise on lymphocyte DNA and antioxidant status in trained athletes. The study was carried out in two phases. In the first phase, 11 trained athletes were subjected to a treadmill run to exhaustion using a ramp protocol to determine their maximum oxygen uptake (V02 max). Fifteen millimetres of blood was collected before exercise, immediately after exercise, 24 hours and 48 hours after exercise. Whole blood (4 ul) was used in the determination of DNA damage in lymphocytes using the single cell gel electrophoresis (SCGE) assay. The remaining blood was centrifuged and used for the following: Vitamin C concentration was determined by the 2,4 dinitrophenylhydrazine method, vitamin E concentration was determined by the High Pressure Liquid Chromatography (HPLC) method and lipid peroxides were determined by the measurement ofhydroperoxides. In the second phase, 3 trained athletes who had participated in phase 1, were subjected to a V02 max. test. Blood samples (10 ml) were collected before and immediately after exercise, 24 hours and 48 hours later. Lymphocytes were isolated using Histopaque 1077. An in situ cell death detection kit, Fluorescein was used for the detection and quantification of apoptosis in lymphocytes at a single cell level, based on labelling of DNA strand breaks. Analysis was carried out using flow cytometry. Lymphocytes were also prepared for Transmission Electron Microscopy (TEM) using conventional techniques. The results showed that immediately after exercise there was a non-significant decrease in vitamin C concentrations (p=o, 16), and a non-significant increase in vitamin E (p=0,82) and lipid peroxide concentrations (p=0,21). There was no significant difference in all 3 levels over the 48 hour period, when compared to the pre-exercise values. The SCGE assay revealed that the immediate post exercise samples showed DNA damage in lymphocytes of all subjects as evidenced by fluorescent strands of DNA outside the cell while DNA damage was observed in only one subsequent sample. In the pre-exercise samples, DNA was visualised as a central core, whereas in all samples taken after exercise, DNA was located at the periphery or confined to one pole of the cell. The pattern of DNA distribution seen in the SCGE assay over the 48 hour period were characteristic features of apoptosis. Flow cytometric analysis showed an increase in apoptosis in lymphocytes immediately after exercise with a further increase after 24 hours. After 48 hours the numbers decreased to control levels. TEM showed that majority of cells were normal before exercise while other lymphocytes were smaller with indented nuclei. Immediately after exercise the lymphocytes displayed features of indented nuclei and microsegregation, cell shrinkage, swelling of the endoplasmic reticulum, mitochondria and Golgi. These changes persisted after 24 hours but were not observed after 48 hours when most of the cells showed normal morphology. The ultrastructural changes observed were also characteristic features of apoptosis. These results suggest that high intensity exercise may cause an increase in apoptosis as evidenced by DNA damage in the SCGE assay and fully supported by the results achieved during flow cytometry and by the ultrastructural changes observed.
The effects of music tempo on performance, psychological and physiological variables during 20 km cycling in well-trained cyclists.
(2013) Dyer, Barry.; McKune, Andrew James.
Introduction Music is commonly used to accompany exercise and has been viewed as a type of legal performance enhancing drug due to its beneficial effects such as reduced RPE, increased work output, enhanced mood, enhanced motor skill acquisition, and increased performance during a variety of exercise tasks. Despite the fact that athletes report using music before, during and after training to increase performance and self-regulate mood, the majority of evidence available has been based on untrained, non-athletic populations. This highlights the need for further research into the effects of music on well-trained individuals engaging in exercise. Objectives The purpose of this study was to investigate the effects of different music tempi on performance, psychological and physiological responses of well-trained, experienced cyclists to time trial cycling. Methods Ten male road cyclists (age:35yrs ± 7, VO2 peak: 5.6 L/min ± 0.4; sum of 7 skinfolds: 58 ± 9.4) performed four 20km time-trials on a Computrainer™ Pro 3D electromagnetically braked indoor cycle trainer over a period of four weeks. The time-trials were spaced a week apart. The music conditions for each trial were randomised between fast-tempo (140 bpm), medium-tempo (120 bpm), slow-tempo (100 bpm), and no-music. Measures recorded during the time-trials included (1) physiological: heart rate, oxygen consumption, breathing frequency, respiratory exchange ratio, (2) psychological: mood states (Profile of Mood States (POMS) pre and post time-trial), (3) Performance: peak and average power output, time to completion, pedal cadence and (4) rating of perceived exertion. Averaged data were compared using one-way analysis of variance. Data for heart rate, oxygen consumption, breathing frequency, RPE, cadence and power output were also collected at three minute intervals during each trial. These were compared using two factor (time x condition) repeated measures analysis of variance. For all data sets, where a significant difference was observed, a Bonferroni post-hoc test was used to determine specific differences. Significance was set at P < 0.05. Results Results revealed no significant changes in physiological variables or performance variables. Total mood disturbance and tension as measured by the POMS were increased significantly in response to the fast-tempo trial. Conclusion Fast tempo music is often perceived as highly motivational and results in increased arousal in the listener. It is likely that prolonged exposure to arousing stimuli such as fast tempo music in conjunction with the intense sensations associated with time-trial exercise could have led to the disturbances in mood state observed during the fast-tempo music trial.

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