[[abstract]]The objective of this study is to discuss the relationship between the intensity of physical activity during class breaks and health fitness of elementary school students, the relationship between the said physical activity intensity and academic performance, and the relationship between health fitness and academic performance. The subjects of this study were 171 fifth grade male and female students (97 male students and 74 female students) of Taipei Municipal Nanmen Elementary School enrolled for school year of 2004. Their average age was 10.7 years old, average height was 143.45cm, and average weight was 39.53kg. This study divided the subjects into low-intensity, mid-intensity, and high-intensity physical activities, recorded physical activities during class breaks for five days, and conducted fitness test and midterm and final exams. The data were processed with SPSS12.0, and analyzed with descriptive statistics, independent t-test, one-way ANOVA, Scheffe method post-hoc comparison, and Pearson product-moment correlation. The results are as follow: 1.Subjects of different genders showed significant difference in the physical activity intensity, and that of male students was higher that of female students. 2.Subjects of different genders showed significant difference in health fitness; female students showed better performance in flexibility, and male students showed better performance in instant explosive force. 3.Subjects of different classes showed significant difference in physical activity intensity. 4.Subjects of different classes showed significant difference in standing jump. 5.The intensity of physical activity during class breaks and health fitness showed no significant correlation. The conclusion showed that student engaged in high intensity physical activity would have better in“one-minute sit-up”and“standing jump”. The intensity of physical activity during class breaks and health fitness showed no significant correlation.
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