Browsing Faculty of Health Sciences by Author "Ellis, S.M."
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Body composition, disordered eating and menstrual regularity in a group of South African endurance athletes
Botha, Tershia; Wright, Hattie; De Ridder, Johannes; Malan, Dawid; Ellis, S.M. (AFAHPER-SD, 2009)This study investigated menstrual regularity, disordered eating, body composition in a group of female athletes, a s well as the differenc e between body composition and disordered eating in irregular vs normal menstruating ... -
Comparing club level rugby coaches and players’ perceptions of coaching effectiveness
Broodryk, R.; Van den Berg, P.H.; Kruger, A.; Ellis, S.M. (AFAHPER-SD, 2014)The objective of this study was to compare players' and coaches' perceptions on coaching effectiveness. A total of 155 participants from the Puk Rugby institute (PRI) were available for this study (players, n = 142; coaches, ... -
A comparison of the effect of two intervention regimes on coronary prone executives in the South African colliery industry
Grace, J.M.; Wilders, C.J.; Strydom, G.L.; Ellis, S.M. (The South African Society of Occupational Medicine, 2012)Corporate environment presently realises the importance of health promotion strategies to ensure health and productivity. In this pre-test-post-test quasi-experimental study, the effect of two intervention strategies ... -
Dietary intakes assessed by 24-h recalls in peri-urban African adolescents: validity of energy intake compared with estimated energy expenditure
Rankin, D.; Ellis, S.M.; Hanekom, S.M.; Wright, H.H.; MacIntyre, U.E. (Nature Publishing Group, 2011)Background/objective: The objective of this study is to determine the relative validity of reported energy intake (EI) derived from multiple 24-h recalls against estimated energy expenditure (EE(est)). Basal metabolic ... -
Estimating an effect size in one-way multivariate analysis of variance (MANOVA)
Steyn, H.S.; Ellis, S.M. (Taylor & Francis, 2009)When two or more univariate population means are compared, the proportion of variation in the dependent variable accounted for by population group membership is eta-squared. This effect size can be generalized by using ... -
Influence of body composition on the prevalence of postural deformities in 11 to 13 Year Old black South African children in the North West Province
Wilders, Cilas J.; De Ridder, Johannes Hans; Stroebel, Susanne; Ellis, S.M. (NWU, 2009)The aim of this study is to investigate the influence of body composition on the prevalence of postural deformities among Black South African children aged 11 to 13 years in selected schools in the Potchefstroom area in ... -
Nutritional genetics: the case of alcohol and the MTHFR C677T polymorphism in relation to homocysteine in a black South African population
Nienaber-Rousseau, C.; Pisa, P.T.; Venter, C.S.; Ellis, S.M.; Kruger, A.; Moss, S.J.; Melse-Boonstra, A.; Towers, G.W. (Karger, 2013)Background/Aims: It is unknown whether the effect of alcohol consumption on homocysteine (Hcy) is modulated by the methylenetetrahydrofolate reductase (MTHFR) C677T. We explored this hypothesized effect by analyzing ... -
The relationship between burnout and mood state among student rugby union players
Grobbelaar, H.W.; Malan, D.D.J.; Steyn, B.J.M.; Ellis, S.M. (LAM Publications, 2011)Mood state changes are widely regarded as a symptom of athlete burnout and show potential to be used as a marker for this condition. The aim of this study was to determine whether changes in burnout scores would be accompanied ...