單次不同振幅全身振動運動對下肢爆發力的影響

The acute effects of different amplitude whole-body vibration on the explosive performance of lower extremities

"目的：本研究旨在探討不同振幅的間歇式全身振動運動對爆發力運動表現、荷爾蒙及肌電訊號的影響。方法：以20名男性大學運動員為研究對象。受試者分別接受四種不同實驗處理，包括一般熱身處理（WUP）、無振動處理（CON，0Hz，0mm）、低振幅振動處理（LAT，30Hz，1.6mm，1.45g）及高振幅振動處理（HAT，30Hz，2.8mm，2.54g）。本研究採重覆量數、平衡次序原則之實驗設計。受試者以半蹲姿勢站立於振動平臺上，接受間歇式全身振動運動1分鐘x10組，其組間休息為1分鐘。爆發力測驗項目有下蹲跳與30秒連續跳。於實驗處理中擷取肌電訊號與血液樣本。以重覆量數單因子變異數分析與LSD事後考驗進行統計分析。結果：下蹲跳與30秒連續跳運動表現、血乳酸、睪固酮及皮質固醇，在四種處理之間，皆未達顯著差異（p＞.05）。LAT股二頭肌的EMGrms顯著低於HAT、WUP及CON（p＜.05）。於30秒連續跳測驗中，LAT右腳股二頭肌的中位頻率顯著高於HAT與CON（p＜.05）；LAT左腳股二頭肌的中位頻率顯著高於HAT、CON及WUP（p＜.05）。結論：本研究結果發現不同振幅（≤2.8mm）振動運動無法促進爆發力運動表現，但是低振幅振動運動卻能延緩爆發耐力運動時股二頭肌疲勞程度。Purpose: This study aimed to investigate the effects of different amplitudes whole-body vibration (WBV) on the explosive performance, hormone and surface electromyography (EMG) activities. Methods: Twenty male college athletes voluntarily participated in this study. All subjects were assigned to four treatments, included general warm up (WUP), non-vibration exercise (CON, 0 Hz, 0 mm), low-amplitude (LAT, 30 Hz, 1.6 mm,1.45 g), and high-amplitude (HAT, 30 Hz, 2.8 mm, 2.54 g) treatments by randomized, balanced order designed. Each subject performed 1min × 10 sets (1min rest interval) WBV on the vibration platform with half-squat position. Explosive performance tests consisting of counter movement jump (CMJ) and 30 seconds continue jump (CJ). EMG and blood samples were recorded from the treatments. 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, testosterone and cortisol levels. In the CMJ test, the EMGrms of biceps femoris in LAT were significantly lower than those in HAT, WUP and CON (p < .05). In the CJ test, 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 different amplitudes (2.8 mm) of vibration exercise could not improve the power performance; however, the low-amplitude of WBV might delay the fatigue of the biceps femoris during power endurance exercise."