[[abstract]]Association of Physical Activity Level, Peer Relation, and Physical Self-concept in Later Childhood: Sport Participation and Gender Differences Master’s Thesis, 2006 Peng-jen Chen Advisor: Hank Junling Jwo, Ph.D. Abstract Psychological Model for Physical Activity suggests the individual perception of physical capability can promote attraction of physical activity and reflects constant physical activity participation. This study was designed to examine the association of physical activity level, peer relation, and physical self-concept with sport participation and gender differences in later childhood. Three hundred and sixty-seven children in twelve grades were purposive sampled, whose average age were 11.9 ± 0.5 years. Physical Activity Questionnaire, Index of Sociometric Status Score, and Physical Self-concept Inventory were completed by all participants. The collected data were analyzed by Pearson Product Moment correlation and t-tests. The results showed that: (1) The physical activity level in later childhood was positively correlated with the physical self-concept, and the item of flexibility, endurance, appearance, and strength. However, the physical activity level was negatively correlated with fatness; (2) There were general significantly among the physical activity level and physical self-concept in later childhood. Boys had higher endurance, appearance, and strength than that of girls. Girls had higher scores in flexibility and fatness but no significant difference was found; (3) Significant difference was found among physical activity level, peer relation, and physical self-concept in later childhood with sport participation; (4) Significant difference was found that in later childhood with higher physical activity level had batter physical self-concept than ones with lower physical activity level. Therefore, it was concluded that, in later childhood with higher physical activity level had higher physical self-concept, boys had higher physical activity level and physical self-concept than girls in later childhood, and the later childhood with sport participation than ones without sport participation in physical activity level, peer relation, and physical self-concept. Key words：physical activity level, physical self-concept, peer relation
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