Biological Maturation, Physical Activity, and Sedentary Behaviour among Korean Adolescents Open Access
- Other title
- Type of item
- Degree grantor
University of Alberta
- Author or creator
Lee, Eun Young
- Supervisor and department
Spence, John C. (Physical Education and Recreation)
- Examining committee member and department
Bell, Rhonda (Agricultural, Food, & Nutritional Science)
Sherar, Lauren (School of Sport, Exercise and Health Sciences; Loughborough University)
Harber, Vicki (Physical Education and Recreation)
Physical Education and Recreation
- Date accepted
- Graduation date
Doctor of Philosophy
- Degree level
The purposes of this thesis were to (1) examine the role of pubertal timing in sex differences in physical activity and sedentary behaviour in a representative sample of Korean adolescents, (2) investigate the roles of psychosocial correlates of the relationship between pubertal status and physical activity among Korean girls, and (3) test links between pubertal timing and screen-time among Korean adolescents. Three studies were conducted to achieve these research purposes.
Study 1 examined whether pubertal timing mediates the relationship between sex and physical activity, and sedentary behaviour. Though pubertal timing mediated the relationship between sex and sedentary behaviour, sex was an important predictor of physical activity and sedentary behaviour, regardless of the variations in pubertal timing among Korean adolescents.
Study 2 examined whether body fatness (i.e., body mass index and % body fat), sport competence, perceived barriers to physical activity, and self-efficacy mediated, and parental support moderated the relationships between pubertal status and physical activity among Korean adolescent girls. Body fatness, perceived barriers to PA, and self-efficacy mediated the relationship between pubertal status and PA. Parental support did not moderate the relationship between pubertal status and physical activity.
Study 3 tested links between pubertal timing at Grade 8 and screen-time at Grade 9 among Korean adolescent boys and girls. No direct effect of pubertal timing on screen-time was found. An indirect effect of pubertal timing on screen-time through BMI existed among boys. Among girls, pubertal timing negatively predicted BMI; however, no mediation effect of BMI between pubertal timing and screen-time was observed. No mediation effect of self-esteem or depression was found among boys and girls.
- Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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