| Summary: | 碩士 === 國立彰化師範大學 === 運動學系 === 107 === Aim: This study aimed to investigate the correlations between the countermovement vertical jump and the physical plus fitness factors of male adolescent track athletes. A multiple regression analysis was conducted to decide the predictors of vertical jump performance. Method: 120 male track athletes of high school were recruited to join this study. Each was subjected to the measurements of height, weight, BMI, body fat and muscular percentages, medicine ball throwing, vertical jump, reaction time, sit-and-reach, hexagon test. Data were analyzed with descriptive statistics, Person correlation coefficient and the stepwise multiple regression by using SPSS 20.0. Statistical significance level of α= 0.5 was used for all analysis. Results: Vertical jump performance was significantly correlated with 8 variables, namely, medicine ball throwing (r =.538), hexagon test (r = -.490), reaction time (r = -.473), age (r = .445), fat-free mass (r = .311), sit-and-reach (r = .258), height (r = .227), weight (r = .223). The stepwise regression analysis selected the medicine ball throwing, reaction time, and hexagon test as predictors, with the explained variance (R2) of 28.9%, 10.3% and 4.3%, respectively, and resulted in a sum of 43.5%. Conclusion: This study showed that physical and fitness factors were related to vertical jump performance, and fitness factors were more decisive than physical factors.
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