| Summary: | 碩士 === 國立臺灣體育運動大學 === 體育研究所 === 101 === The purpose of this study is to investigate the relationship between the body image and the physical activity of fifth- and sixth-grade students based on self-discrepancy theory. This study was conducted upon a cohort of 1107 fifth- and sixth-grade students studying in elementary schools in Central District, Taichung City. The assorted data has been processed by the SPSS software package to carry out descriptive statistics, independent samples t test, multivariate analysis, correlation and other statistical analyses. The results of the study are as follows: (a) The fifth- and sixth- grade students mostly like to exercise; the majority of them are physically healthy as well; and their BMI values mostly fall within the normal range. Boys’ amounts of physical activity are significantly higher than girls’, but no significant difference can be found between fifth grade and sixth grade. (b) Boys’ score higher than girls’ in “actual me" and "ought me", showing that boys are generally more self-confident and also have a greater sense of responsibility than girls. Both boys’ and girls’ score higher in “ideal me” than in "actual me" and "ought me", and no significant difference between boys and girls can be detected, suggesting that both boys and girls have expectations of themselves. As for a comparison between the two grades, fifth-grade students score higher than their sixth-grade counterparts in all three aspects. The students under investigation show a significant divergence between their respective conditions of self-discrepancy in body image: the multivariate analysis suggests a Wilks'Lambda value (Λ) of .60 and a significance of .00; in the F test, actual me/ ideal me, actual me/ought me, ought me/ideal me all reached a significant .00. (c) There is a positive correlation between the students’ physical conditions and their attitudes towards exercise, "actual me”, "ideal me”, and "ought me”. On the contrary, a negative correlation exists between the students’ BMI values and their attitudes towards exercise, "actual me”, and "ought me”—those with higher BMI values are less motivated in their attitudes towards exercise and are less confident as well; however, there is no obvious correlation between the students’ BMI values and their physical conditions, "ideal me", and physical activity.
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