Physical inactivity, a modifiable risk factor for coronary heart disease (CHD) both in persons with intellectual disability (ID) and non-ID, is considered the fourth leading cause of death in the world. Long-term regular participation in physical activity is associated with a reduced risk for CHD. Literature currently lacks evidence on the effect of long-term physical activity on the functional capacity and risk factors for developing CHD in persons with ID. The purpose of this study was firstly, to determine the effect of a long-term physical activity intervention on the risk factors associated with developing CHD and secondly the effect of a combined aerobic and resistance physical activity intervention on the functional capacity of persons with ID. A cohort of seventy-four (74) participants living in a care facility in Potchefstroom, South Africa, participated in this study, a seven-year follow-up physical activity intervention study. To determine the effect of a seven-year combined aerobic and resistance exercise intervention programme, data was collected in 2006 and in 2013. At baseline (2006) and end (2013), a CHD risk profile was determined by means of a questionnaire and physical assessment. The physical assessment included resting blood pressure, peripheral glucose and cholesterol measurements, and body composition by means of body mass index (BMI), waist-to-hip ratio (WHR) and body fat percentage derived from skinfold measurements. Cardiorespiratory fitness was assessed by means of the adapted sub-maximal YMCA bicycle ergometer protocol from which a physical work capacity (PWC) was calculated. The participants followed a structured physical activity intervention two days per week for at least 45 minutes for a seven year period. The exercise intervention consists of cardiorespiratory exercises, muscle stretches and muscle endurance exercises. All data analyses were performed with SPSS 22.0 (IBM SPSS Statistics, Armonk, NY) statistical analysis software programme. The descriptive statistics (mean and standard deviations) as well as frequencies were calculated to describe the characteristics of the participants and the point prevalence of the CHD risk factors. General Linier Model analyses were applied to determine the significant changes in CHD risk factors measured from baseline to end with adjustment for baseline measurements. McNemar exact test indicated significant changes in the point prevalence of the CHD risk factors from baseline to end. The relationship between the changes in the cardiorespiratory fitness and the measured risk factors were performed with a partial correlation analysis adjusting for age in 2013. The level of significance was set at p ≤ 0.05. The results indicate that the prevalence of inactivity decreased with 50% after the seven-year intervention program. Prevalence of age as a risk factor for developing CHD increased significantly post-intervention from 10% to 18%. Body mass decreased significantly in men (1.25 ± 5.43 kg) and increased significantly in women (0.15 ± 6.83kg). BMI changes reflect changes in body mass of the participants. Body fat percentages increased both in men (2.98%) and in women (0.95%). A significant increase in systolic blood pressure (6.2 ± 10.1 mmHg) for men and diastolic blood pressure (6.35 ± 10.42 mmHg) for women was found. Physical work capacity in both male (1.90 ± 0.73 watt/kg) and female (1.55 ± 0.43 watt/kg) participants decreased to 1.43 ± 0.45 watt/kg and 1.14 ± 0.46 watt/kg respectively during the intervention period. Although a correlation between changes in PWC and the risk factors for CHD was found, none of the correlations was significant when adjusted for age in 2013. The conclusion drawn from this study is that a long-term physical activity intervention in a population with ID reduced the point prevalence for physical inactivity and overweight and obesity, in spite of a decrease in cardiorespiratory fitness. The changes in cardiorespiratory fitness did not relate to the changes observed in the risk factors of CHD. / MSc (Biokinetics), North-West University, Potchefstroom Campus, 2015

Obesity is affecting an increasingly larger proportion of adolescents in the world, and this can be attributed to low resting metabolic rate (RMR) as well as reduced physical activity (PA) levels. Little is known about objectively determined habitual PA and RMR in 16 year old African adolescents. The purpose of this study is twofold. Firstly, to determine the objectively measured PA status of adolescents and secondly, to determine the relationship that exists between RMR and PA in 16 year old adolescents. Two hundred and twenty six (226) adolescents aged sixteen (16) wore the Actiheart® monitor, combined accelerometry and heart rate for seven (7) consecutive days. Six high schools were recruited to take part in the study: two from town (high socio-economic status) and four from the township (low socio-economic status) of the Potchefstroom area of the North West Province of South Africa. Times spent in moderate to vigorous physical activity, physical activity counts per minute (CPM), total energy expenditure (TEE), active energy expenditure (AEE) and physical activity levels (PAL) were assessed using the Actiheart®. The participants’ RMR was measured by indirect calorimetry using the Fitmate Pro (Cosmed, Italy). All data analyses were performed with the SPSS Version 20 software (IBM SPSS, II). The descriptive statistics (mean and standard deviations) as well as independent t-tests and Mann-Whitney U test were performed to determine differences between ethnicity and genders and to calculate practical significance. A Type I error rate of p ≤ 0.05 was used for statistical significance. To investigate the relationship between RMR and physical activity regression analysis was performed with adjustment for gender, race and fat free mass. Results: Significantly higher PAL (1.57 ± 0.15) were determined in girls compared to boys (PAL = 1.41 ± 0.10). Black adolescents indicated significant higher PAL (1.53 ± 0.14) compared to white adolescents (1.45 ± 0.16). On average, regardless of race or gender, the participants were more active on weekdays than weekends. The current study shows that girls spent more minutes/day in moderate to vigorous physical activity (MVPA) than the boys. The results show that 16.4% of the study sample was either overweight or obese. After adjustment for gender, ethnicity and FFM, linear regression between RMR and moderate-to-vigorous PA yielded an r2 = 0.46 (p ˂ 0.05.) Conclusion: Objectively determined PA of adolescents in South Africa indicates that only one third of adolescents are meeting the recommended 60 minutes of daily MVPA. Gender and race specific interventions are needed to increase habitual physical activity levels in adolescents. Given the fact that the studied sample did not meet recommended daily physical activity and the adverse effect of inactivity and chronic diseases of life style, urgent strategies to inculcate the culture of regular physical activity as a preventative measure of chronic diseases of life style are needed. Behaviour that is carried on into adulthood is established during adolescence. Civic health efforts should focus on encouraging adolescent involvement in regular moderate-to-vigorous PA, which will subsequently increase RMR and lower the risk of the development of non-communicable chronic diseases such as obesity. Further local research is needed to confirm the association between RMR and PA in the local population. / Thesis (MSc (Biokinetics))--North-West University, Potchefstroom Campus, 2013.

Television viewing is one of the most easily modifiable causes of obesity among children. The purpose of this study was to determine the relationship between body composition and TV viewing among adolescents attending high schools in the Tlokwe municipality area of the North West province of South Africa. A cross-sectional study design which is part of the Physical Activity and Health Longitudinal Study (PAHLS) was followed on 154 learners (58 boys and 96 girls) who were aged 14 years in the Tlokwe municipality area. All the learners underwent anthropometric measurements of height, weight, and two skinfolds (triceps and subscapular skinfolds). Percentage body fat (%BF) was calculated from the two skinfolds according to Slaughter‟s et al. (1988) equation. Children were classified into three groups (viz. normal, overweight and obese) according to BMI cut-off point suggested by Cole et al. (2000). Pearson correlation coefficients were used to determine the relationship between television viewing and body composition. The results show respectively high prevalence of overweight and obesity in girls (10.4%; 6.3%) as compared to the prevalence of 5% overweight in boys. With regard to TV viewing, the results show that 54% of the total group watch TV more than two hours a day, while only 11% watched TV less than one hour a day. The results show that the group that watches TV for more than 3 hours had high BMI (21.27kg/m²) and body mass (51.54kg). The group that watches TV for 1-2 hours had low BMI (18.36kg/m²) and body mass (44.79kg). There was a statisitcal significant relationship between BMI and body mass (p=0.001). A significant positive relationship between body mass and TV viewing (r=0.56; p=0.05) in overweight group was found, whilst in the obese group strong significant positive relationship was observed between percentage body fat and TV viewieng (r=0.94; p=0.01). It can be concluded that girls were more overweight and obese respectively as compared to the boys. Furthermore, both boys and girls had high percentages of TV viewing for more than two hours a day. In addition, the results indicated that adolescents who watched TV more than 3 hours are heavier and fatter. Therefore, it is recommended that parents and educational heads should encourage periods of daily physical activity. In addition, it is also important that parents play a more positive role in limiting the amount of hours their children spent watching television. / Thesis (MA (Biokinetics))--North-West University, Potchefstroom Campus, 2013.

Obesity is affecting an increasingly larger proportion of adolescents in the world, and this can be attributed to low resting metabolic rate (RMR) as well as reduced physical activity (PA) levels. Little is known about objectively determined habitual PA and RMR in 16 year old African adolescents. The purpose of this study is twofold. Firstly, to determine the objectively measured PA status of adolescents and secondly, to determine the relationship that exists between RMR and PA in 16 year old adolescents. Two hundred and twenty six (226) adolescents aged sixteen (16) wore the Actiheart® monitor, combined accelerometry and heart rate for seven (7) consecutive days. Six high schools were recruited to take part in the study: two from town (high socio-economic status) and four from the township (low socio-economic status) of the Potchefstroom area of the North West Province of South Africa. Times spent in moderate to vigorous physical activity, physical activity counts per minute (CPM), total energy expenditure (TEE), active energy expenditure (AEE) and physical activity levels (PAL) were assessed using the Actiheart®. The participants’ RMR was measured by indirect calorimetry using the Fitmate Pro (Cosmed, Italy). All data analyses were performed with the SPSS Version 20 software (IBM SPSS, II). The descriptive statistics (mean and standard deviations) as well as independent t-tests and Mann-Whitney U test were performed to determine differences between ethnicity and genders and to calculate practical significance. A Type I error rate of p ≤ 0.05 was used for statistical significance. To investigate the relationship between RMR and physical activity regression analysis was performed with adjustment for gender, race and fat free mass. Results: Significantly higher PAL (1.57 ± 0.15) were determined in girls compared to boys (PAL = 1.41 ± 0.10). Black adolescents indicated significant higher PAL (1.53 ± 0.14) compared to white adolescents (1.45 ± 0.16). On average, regardless of race or gender, the participants were more active on weekdays than weekends. The current study shows that girls spent more minutes/day in moderate to vigorous physical activity (MVPA) than the boys. The results show that 16.4% of the study sample was either overweight or obese. After adjustment for gender, ethnicity and FFM, linear regression between RMR and moderate-to-vigorous PA yielded an r2 = 0.46 (p ˂ 0.05.) Conclusion: Objectively determined PA of adolescents in South Africa indicates that only one third of adolescents are meeting the recommended 60 minutes of daily MVPA. Gender and race specific interventions are needed to increase habitual physical activity levels in adolescents. Given the fact that the studied sample did not meet recommended daily physical activity and the adverse effect of inactivity and chronic diseases of life style, urgent strategies to inculcate the culture of regular physical activity as a preventative measure of chronic diseases of life style are needed. Behaviour that is carried on into adulthood is established during adolescence. Civic health efforts should focus on encouraging adolescent involvement in regular moderate-to-vigorous PA, which will subsequently increase RMR and lower the risk of the development of non-communicable chronic diseases such as obesity. Further local research is needed to confirm the association between RMR and PA in the local population. / Thesis (MSc (Biokinetics))--North-West University, Potchefstroom Campus, 2013.

Television viewing is one of the most easily modifiable causes of obesity among children. The purpose of this study was to determine the relationship between body composition and TV viewing among adolescents attending high schools in the Tlokwe municipality area of the North West province of South Africa. A cross-sectional study design which is part of the Physical Activity and Health Longitudinal Study (PAHLS) was followed on 154 learners (58 boys and 96 girls) who were aged 14 years in the Tlokwe municipality area. All the learners underwent anthropometric measurements of height, weight, and two skinfolds (triceps and subscapular skinfolds). Percentage body fat (%BF) was calculated from the two skinfolds according to Slaughter‟s et al. (1988) equation. Children were classified into three groups (viz. normal, overweight and obese) according to BMI cut-off point suggested by Cole et al. (2000). Pearson correlation coefficients were used to determine the relationship between television viewing and body composition. The results show respectively high prevalence of overweight and obesity in girls (10.4%; 6.3%) as compared to the prevalence of 5% overweight in boys. With regard to TV viewing, the results show that 54% of the total group watch TV more than two hours a day, while only 11% watched TV less than one hour a day. The results show that the group that watches TV for more than 3 hours had high BMI (21.27kg/m²) and body mass (51.54kg). The group that watches TV for 1-2 hours had low BMI (18.36kg/m²) and body mass (44.79kg). There was a statisitcal significant relationship between BMI and body mass (p=0.001). A significant positive relationship between body mass and TV viewing (r=0.56; p=0.05) in overweight group was found, whilst in the obese group strong significant positive relationship was observed between percentage body fat and TV viewieng (r=0.94; p=0.01). It can be concluded that girls were more overweight and obese respectively as compared to the boys. Furthermore, both boys and girls had high percentages of TV viewing for more than two hours a day. In addition, the results indicated that adolescents who watched TV more than 3 hours are heavier and fatter. Therefore, it is recommended that parents and educational heads should encourage periods of daily physical activity. In addition, it is also important that parents play a more positive role in limiting the amount of hours their children spent watching television. / Thesis (MA (Biokinetics))--North-West University, Potchefstroom Campus, 2013.

The purpose of this research was to determine whether adolescents who participate in sport perform better academically in comparison to their non–participating counterparts. An availability sample of 210 learners between 14 and 24 years from a secondary school in the Dr Kenneth Kaunda District took part in this research. The participants were assessed by a Biographical Questionnaire adapted from Mpshe (1996); an adapted version of The Physical Activity Index of Sharkey (1979); the General Scholastic and Aptitude Test (GSAT)(Claassen, De Beer, Hugo & Meyer,1998); The revised two–factor Study Process Questionnaire: R–SPQ–2F of Biggs (1987a, 1987b); The Rosenberg Self–Esteem Scale (RSES), Rosenberg (1965); an adapted version of The Self–concept and Motivation Questionnaire of Bester (2003), and The Psychological Wellbeing (PWB) Scales of Ryff (1989). To obtain an overview of the participants’ academic performance, averages obtained in the June 2010 examinations in the four compulsory learning areas, i.e. Setswana First Language, English First Additional Language, Life Orientation and either Mathematics or Mathematical Literacy, were calculated. A significant relationship between sport participation and academic performance was yielded by a cross–tabulation with a practical significance of 0.09. Univariate regression models with academic performance as dependent variable and the following variables as independent variables were calculated as separate models, namely: IQ, Deep approach and Surface Approach as dimensions of the R–SPQ–2F, Motivation, Self–esteem and Psychological well–being. Only self–esteem was found to significantly predict academic performance. A further analysis using an interaction between sport participation and self–esteem did not yield a significant finding. It was concluded that it is important that Educational planners should take cognisance of the literature and research findings of this study. In future studies bigger samples can be used and the interaction between cognitive, non–cognitive and sociodemographic variables in the prediction of academic performance can be studied. / Thesis (M.A. (Research Psychology))--North-West University, Potchefstroom Campus, 2011.

The primary objective of this study was to investigate whether adolescents make use of an ethical decision–making framework when they make choices in relation to sexual activities and the elements that make up this ethical decision–making framework. The adolescent stage of development is characterized by physical and cognitive changes, of which the development of sexual characteristics and morality are only parts. Both these developments are discussed at length within the context of adolescent sexual activity, and cognitive and moral development. Different influences on the morality of adolescents were identified, of which the faith community of adolescents were one. These elements also influence the ethical decision–making framework of adolescents on sexual activity. The influence of the religious community on the ethical decision–making framework of adolescents was also investigated on the basis of the faith community's message about sexual activities and the perceptual influence of the religious community on the morality of adolescents. The sexual activity of adolescents, adolescents? perceptions about these sexual activities as well as the messages and sources of information that are available to adolescents with regard to sex was identified by making use of Participant Observation Research. A small group of participants and observers used the PIRASH program to identify the above–mentioned information. The participants also identified the obstacles that adolescents must overcome to establish a healthy sexual life, and what their definition of a healthy sexual life is. Participants in this study agreed that their faith community did not provide enough information to adolescents about sex and sexual activities. Participants indicated this lack of information as their reason for using other sources of information about sexual activities. These messages conveyed by other sources, including those of the media, friends and parents vary from those the faith community has about sex. Adolescents have easier access to these other sources; therefore there is a difference between the faith community's view on sexual activity and that of the adolescents who form part of the faith community. It is concluded that it is necessary, almost urgently, for faith communities to establish the actual view of adolescents who form part of the community, on sexual activity, and to have a stronger influence on the ethical decision–making framework of adolescents. The ethical decision–making framework of adolescents can only be influenced if the faith communities speak more comfortably and more extensively with their adolescents about sex and sexual activities. Postmodern adolescents have access to a variety of sources with a variety of messages about sex and the importance of moral messages from the faith community cannot be underestimated. A secondary outcome of this study was to explore the possibility of Participant Observation Research as research methodology within Theological Ethics. / Thesis (M.A. (Ethics))--North-West University, Potchefstroom Campus, 2011.

During the past decades there has been an increase in longevity. These aging trends have an enormous economic impact and present challenges to policymakers, families, and health care providers to meet the needs of aging individuals. Aging is accompanied with various physiological changes that can limit the elderly’s functional status and their independency. Some of the most noticeable changes occur within the musculoskeletal system, however cardiorespiratory changes, as well as changes in the body composition limits the elderly’s aerobic capacity and therefore increases the risk for cardiovascular and hypokinetic diseases. Moderate physical activity reduces the risk, or prolong the onset of physiological changes and various diseases. Physical activity can also enhance functional fitness amongst the elderly. Functional fitness is having the physiologic capacity to perform normal everyday activities safely and independently without undue fatigue. The aim of this study was to determine the functional fitness as well as static balance and dynamic balance status of senior citizens. Secondly, to determine the association between: physical activity, aerobic endurance and functional fitness and status amongst senior citizens. Thirdly, to determine the association between physical activity status, aerobic endurance and static– and dynamic balance amongst elderly. A once off subject availability study was performed, and 58 senior citizens (32 females and 26 males) between the ages of 65 years and 96 years participated. The physical activity index was determined with the Sharkey and Gaskill Physical activity index questionnaire. Functional fitness was measured using the Rikli and Jones Fullerton’s functional fitness test protocol. The static balance and dynamic balance was tested with the one leg balance eyes closed and functional reach test respectively. Descriptive statistics were used to describe the status of the participants. Two way summary tables were used to categorize the amount of weak test results. Partial correlations were used to determine the association between physical activity, functional fitness and static and dynamic balance. The male participants’ functional fitness status compared well with USA normal ranges, however the functional fitness test scores of the female participants were even lower than the older age group (75 to 79 years) of the USA normal ranges. The results of the frequency distribution indicated that 80.77% and 68.75% of the male and female participants respectively, tested poorly in more than four of the functional fitness tests. Neither the male nor the female participants’ static balance score were adequate, although it does not indicate a fall risk. Aerobic endurance showed to have medium (r = 0.3–0.49) to high (r 0.5) partial correlation with all functional fitness tests for the total group, as well as in the female participants. In the male participants aerobic endurance only showed high correlation (r 0.5) with lower body strength and dynamic balance and agility. Dynamic balance correlated well (r 0.5) with all functional fitness tests as well as aerobic endurance and physical activity index in the female participants, and only showed a medium correlation with agility in the male participants. This study showed alarming percentages of poor test results for both male and female senior citizens and highlights the need for physical activity interventions in old age homes. The correlations between aerobic endurance, as well as dynamic balance and functional fitness tests indicates that even simple interventions such as walking programs could enhance the functional fitness of senior citizens and thereby increase their independency. / Thesis (M.A. (Biokinetics))--North-West University, Potchefstroom Campus, 2011.

The purpose of this research was to determine whether adolescents who participate in sport perform better academically in comparison to their non–participating counterparts. An availability sample of 210 learners between 14 and 24 years from a secondary school in the Dr Kenneth Kaunda District took part in this research. The participants were assessed by a Biographical Questionnaire adapted from Mpshe (1996); an adapted version of The Physical Activity Index of Sharkey (1979); the General Scholastic and Aptitude Test (GSAT)(Claassen, De Beer, Hugo & Meyer,1998); The revised two–factor Study Process Questionnaire: R–SPQ–2F of Biggs (1987a, 1987b); The Rosenberg Self–Esteem Scale (RSES), Rosenberg (1965); an adapted version of The Self–concept and Motivation Questionnaire of Bester (2003), and The Psychological Wellbeing (PWB) Scales of Ryff (1989). To obtain an overview of the participants’ academic performance, averages obtained in the June 2010 examinations in the four compulsory learning areas, i.e. Setswana First Language, English First Additional Language, Life Orientation and either Mathematics or Mathematical Literacy, were calculated. A significant relationship between sport participation and academic performance was yielded by a cross–tabulation with a practical significance of 0.09. Univariate regression models with academic performance as dependent variable and the following variables as independent variables were calculated as separate models, namely: IQ, Deep approach and Surface Approach as dimensions of the R–SPQ–2F, Motivation, Self–esteem and Psychological well–being. Only self–esteem was found to significantly predict academic performance. A further analysis using an interaction between sport participation and self–esteem did not yield a significant finding. It was concluded that it is important that Educational planners should take cognisance of the literature and research findings of this study. In future studies bigger samples can be used and the interaction between cognitive, non–cognitive and sociodemographic variables in the prediction of academic performance can be studied. / Thesis (M.A. (Research Psychology))--North-West University, Potchefstroom Campus, 2011.

The primary objective of this study was to investigate whether adolescents make use of an ethical decision–making framework when they make choices in relation to sexual activities and the elements that make up this ethical decision–making framework. The adolescent stage of development is characterized by physical and cognitive changes, of which the development of sexual characteristics and morality are only parts. Both these developments are discussed at length within the context of adolescent sexual activity, and cognitive and moral development. Different influences on the morality of adolescents were identified, of which the faith community of adolescents were one. These elements also influence the ethical decision–making framework of adolescents on sexual activity. The influence of the religious community on the ethical decision–making framework of adolescents was also investigated on the basis of the faith community's message about sexual activities and the perceptual influence of the religious community on the morality of adolescents. The sexual activity of adolescents, adolescents? perceptions about these sexual activities as well as the messages and sources of information that are available to adolescents with regard to sex was identified by making use of Participant Observation Research. A small group of participants and observers used the PIRASH program to identify the above–mentioned information. The participants also identified the obstacles that adolescents must overcome to establish a healthy sexual life, and what their definition of a healthy sexual life is. Participants in this study agreed that their faith community did not provide enough information to adolescents about sex and sexual activities. Participants indicated this lack of information as their reason for using other sources of information about sexual activities. These messages conveyed by other sources, including those of the media, friends and parents vary from those the faith community has about sex. Adolescents have easier access to these other sources; therefore there is a difference between the faith community's view on sexual activity and that of the adolescents who form part of the faith community. It is concluded that it is necessary, almost urgently, for faith communities to establish the actual view of adolescents who form part of the community, on sexual activity, and to have a stronger influence on the ethical decision–making framework of adolescents. The ethical decision–making framework of adolescents can only be influenced if the faith communities speak more comfortably and more extensively with their adolescents about sex and sexual activities. Postmodern adolescents have access to a variety of sources with a variety of messages about sex and the importance of moral messages from the faith community cannot be underestimated. A secondary outcome of this study was to explore the possibility of Participant Observation Research as research methodology within Theological Ethics. / Thesis (M.A. (Ethics))--North-West University, Potchefstroom Campus, 2011.