| Summary: | 碩士 === 台北巿立體育學院 === 運動技術研究所 === 97 === ABSTRACT
Purpose: This study aimed to investigate (30Hz) the effects of different amplitudes (0.8mm and 1.4mm) whole-body vibration (WBV) on the explosive performance, hormone and surface electromyography (EMG) activity of counter movement jump (CMJ) and 30-s continue jump (CJ) tests. Methods: The twenty male college athletes participated in this study. All subjects were assigned to four treatments, included general warm up treatment (WUP), non-vibration exercise treatment (CON, 0 Hz, 0 mm), low-amplitude treatment (LAT, 30 Hz, 0.8 mm,1.45 g), and high-amplitude treatment (HAT, 30 Hz, 1.4 mm, 2.54 g), treatments by randomized, balanced order designed. Each subject performed 1-min × 10 sets (1-min rest interval) WBV on the vibration platform with half-squat position. The data were analyzed by repeated one-way ANOVA and LSD post hoc test. Results: There were no significant differences on the CMJ and CJ performances, lactate levels, testosterone levels, cortisol levels, and iEMG of CMJ and CJ among the four treatments. The EMGrms and co-contraction index (H/Q) of biceps femoris in LAT were significantly lower than those in HAT, WUP and CON (p<.05). In the CJ test, the mean frequency of right biceps femoris in LAT was significantly higher than that in HAT (p<.05), and the mean frequency of left biceps femoris was also significantly higher than those in CON and WUP (p<.05). The median frequency of right biceps femoris in LAT was significantly higher than those in HAT and CON (p<.05), and the median frequency of left biceps femoris was also significantly higher than those in the other treatments (p<.05). Conclusion: These results indicated that the low-amplitude WBV might increase the stability of knee joint, and delay the fatigue of the biceps femoris.
Key words: counter movement jump, continue jump, co-contraction index, EMG, hormone
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