Predicting backstroke performance in junior swimmers
- Authors: Botes, René Antoinette
- Date: 2015
- Subjects: Anthropometry , Body composition , Human movement studies , Swimmers
- Language: English
- Type: Masters (Thesis)
- Identifier: http://hdl.handle.net/10210/17559 , uj:15474
- Description: The purpose of this study was to identify the anthropometric, body composition, and motor abilities that best predict backstroke performance in male and female junior swimmers. Eighteen club level swimmers aged 12-14 years volunteered to take part in this study. Two days of testing included assessment of anthropometric (body fat percentage, body mass), longitudinal characteristics (height, upper body length, hand length, foot length, and arm span) and transverse characteristics (circumferences, diameters) and motor abilities (flexibility, muscular endurance test, upper and lower body power tests) were assessed on day one. Sport specific water-based tests (25 metre, 7 x 50 metre on 2 minutes, and 200 metre aerobic test) were conducted on the second day during which backstroke swim times, number of strokes were counted per length to calculate technique (stroke distance, stroke frequency, stroke index) as well as swim specific aerobic ability (VO2peak) was calculated using the technique parameters. In addition to descriptive statistics, the predictive variables for backstroke performance (measured in seconds) were investigated using the Pearson product-moment correlation coefficient together with Spearman rho. , M.A.(Sport Science)
- Full Text: false
- Authors: Botes, René Antoinette
- Date: 2015
- Subjects: Anthropometry , Body composition , Human movement studies , Swimmers
- Language: English
- Type: Masters (Thesis)
- Identifier: http://hdl.handle.net/10210/17559 , uj:15474
- Description: The purpose of this study was to identify the anthropometric, body composition, and motor abilities that best predict backstroke performance in male and female junior swimmers. Eighteen club level swimmers aged 12-14 years volunteered to take part in this study. Two days of testing included assessment of anthropometric (body fat percentage, body mass), longitudinal characteristics (height, upper body length, hand length, foot length, and arm span) and transverse characteristics (circumferences, diameters) and motor abilities (flexibility, muscular endurance test, upper and lower body power tests) were assessed on day one. Sport specific water-based tests (25 metre, 7 x 50 metre on 2 minutes, and 200 metre aerobic test) were conducted on the second day during which backstroke swim times, number of strokes were counted per length to calculate technique (stroke distance, stroke frequency, stroke index) as well as swim specific aerobic ability (VO2peak) was calculated using the technique parameters. In addition to descriptive statistics, the predictive variables for backstroke performance (measured in seconds) were investigated using the Pearson product-moment correlation coefficient together with Spearman rho. , M.A.(Sport Science)
- Full Text: false
The observed and perceived body image of female comrades marathon athletes
- Authors: Beukes, Natalie Michelle
- Date: 2008-10-31T08:49:16Z
- Subjects: Women athletes , Body image , Anthropometry
- Type: Thesis
- Identifier: uj:13839 , http://hdl.handle.net/10210/1415
- Description: M.Phil. , This study examined the relationship between perceived and observed body image of female Comrades Marathon athletes. To address this issue, 49 female Comrades Marathon athletes (mean age = 38.4) completed the Multidimensional Body-Self Relations Questionnaire, a standardised instrument assessing affective, cognitive, and behavioural components of appearance-related body image. Anthropometry measured body height, body weight and body fat percentage and was calculated on the basis of six skinfolds as stipulated at the Montreal Olympic Games Anthropological Project. Two groups were established and subjects were classified as underweight or normal/overweight. General findings revealed that the two groups differed only according to three variables of the Multidimensional Body-Self Relations Questionnaire, being fitness orientation (p-value = 0.005<0.05), health orientation (p-value = 0.029< 0.05) and self-classified weight (p-value < 0.0005). Discussion focuses on factors that could influence perceived and observed body image and the role that exercise and sport play in the formation of an athlete’s body image. Practical implications for sport psychologists and coaches who work with athletes are addressed.
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- Authors: Beukes, Natalie Michelle
- Date: 2008-10-31T08:49:16Z
- Subjects: Women athletes , Body image , Anthropometry
- Type: Thesis
- Identifier: uj:13839 , http://hdl.handle.net/10210/1415
- Description: M.Phil. , This study examined the relationship between perceived and observed body image of female Comrades Marathon athletes. To address this issue, 49 female Comrades Marathon athletes (mean age = 38.4) completed the Multidimensional Body-Self Relations Questionnaire, a standardised instrument assessing affective, cognitive, and behavioural components of appearance-related body image. Anthropometry measured body height, body weight and body fat percentage and was calculated on the basis of six skinfolds as stipulated at the Montreal Olympic Games Anthropological Project. Two groups were established and subjects were classified as underweight or normal/overweight. General findings revealed that the two groups differed only according to three variables of the Multidimensional Body-Self Relations Questionnaire, being fitness orientation (p-value = 0.005<0.05), health orientation (p-value = 0.029< 0.05) and self-classified weight (p-value < 0.0005). Discussion focuses on factors that could influence perceived and observed body image and the role that exercise and sport play in the formation of an athlete’s body image. Practical implications for sport psychologists and coaches who work with athletes are addressed.
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Comparison of body mass index and fat percentage criteria classification of 7–13 year-old rural boys in South Africa
- Van Gent, Maya, Pienaar, Anita, Noorbhai, Habib
- Authors: Van Gent, Maya , Pienaar, Anita , Noorbhai, Habib
- Date: 2020
- Subjects: Anthropometry , Children , Body Composition
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/457842 , uj:40642 , Citation: Van Gent, M., Pienaar, A. & Noorbhai, H. 2020. Comparison of body mass index and fat percentage criteria classification of 7–13 year-old rural boys in South Africa. , DOI: https://doi.org/10.1186/s12887-020-02419-9
- Description: Abstract: Background: The aim of this paper was to investigate whether BMI and fat percentage classification criteria, would classify a sample of 7–13 year old boys from a rural background in similar nutritional categories. Methods: A cross-sectional study with a stratified random sampling included 601 rural boys (7–13 years old). Fat percentage criteria classification and BMI were calculated and compared. Maturity status, and age at peak height velocity (PHV) were indirectly determined. Statistical techniques included descriptive statistics, Pearson product correlation coefficients, the Kappa agreement test and the McNemar’s test. The level of statistical significance was set at p ≤ 0.05. Results: All age groups presented with statistically significant high correlations between BMI and fat percentage, and low to medium correlations between fat percentage and maturity age (MA). Measurement of agreement between BMI and fat percentage classifications showed poor to fair agreements for all age groups, with the exception of the eight-year old group which presented a moderate agreement. Conclusions: Classifications based on BMI and fat percentage, results in different classifications for the same population. Until further research has been done to determine the best classification for nutritional status, it is recommended that both classification methods be used for more accurate classification of nutritional status.
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- Authors: Van Gent, Maya , Pienaar, Anita , Noorbhai, Habib
- Date: 2020
- Subjects: Anthropometry , Children , Body Composition
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/457842 , uj:40642 , Citation: Van Gent, M., Pienaar, A. & Noorbhai, H. 2020. Comparison of body mass index and fat percentage criteria classification of 7–13 year-old rural boys in South Africa. , DOI: https://doi.org/10.1186/s12887-020-02419-9
- Description: Abstract: Background: The aim of this paper was to investigate whether BMI and fat percentage classification criteria, would classify a sample of 7–13 year old boys from a rural background in similar nutritional categories. Methods: A cross-sectional study with a stratified random sampling included 601 rural boys (7–13 years old). Fat percentage criteria classification and BMI were calculated and compared. Maturity status, and age at peak height velocity (PHV) were indirectly determined. Statistical techniques included descriptive statistics, Pearson product correlation coefficients, the Kappa agreement test and the McNemar’s test. The level of statistical significance was set at p ≤ 0.05. Results: All age groups presented with statistically significant high correlations between BMI and fat percentage, and low to medium correlations between fat percentage and maturity age (MA). Measurement of agreement between BMI and fat percentage classifications showed poor to fair agreements for all age groups, with the exception of the eight-year old group which presented a moderate agreement. Conclusions: Classifications based on BMI and fat percentage, results in different classifications for the same population. Until further research has been done to determine the best classification for nutritional status, it is recommended that both classification methods be used for more accurate classification of nutritional status.
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