摘要：This study assessed the contribution of forceful arm swing during the eccentric and concentric phases of the countermovement jump (CMJ), in order to determine the effect on CMJ performance. Fourteen women performed three test exercises, including the CMJ with no shoulder extension during the eccentric phase, CMJ with no shoulder flexion during the concentric phase, and normal CMJ including maximal shoulder flexion and extension. Jump height (JH), power (P), and ground reaction force (GRF) were assessed using a force platform. A repeated measures ANOVA was used to assess the differences between the test exercises for JH, P, and GRF. A Bonferroni post hoc analysis was performed to identify specific differences between test exercises. Analysis demonstrated significant differences between test conditions for JH (P<0.001) and P (P<0.001), but not for GRF (P>0.05). This study demonstrated significant differences between jumping conditions that maximized arm swing. Conditions omitting the upward and downward arm swing resulted in jump heights 12.1% and 3.51% less than the normal CMJ, respectively. Therefore, arm swing is important to both the eccentric and concentric phase of jumping.
