Passive Repetitive Isokinetic Training Compared with Resistance Training: Effects on Performance and Hormones in Untrained Men
Keywords:Resistance training, growth hormone, testosterone, cortisol, 肌力, 生長激素, 睪固酮, 皮質醇
LANGUAGE NOTE | Document text in English; abstract also in Chinese.
The purpose of this study was to investigate the effects of 10 weeks Passive Repetitive Isokinetic Training (PRI) training on hormone concentrations and physical performance. Nineteen untrained men were randomized to intervention with either PRI training (n=10) or traditional resistance training (n=9). PRI group performed five sets with ten repetitions with corresponding 70-75% repetition maximum (RM) loads on the PRI platform and 2-min rest periods, whereas TR group performed the same protocol with squat exercise. Strength and power performance testing were measured before and after 10-week training. Resting hormones were measured at pre-training (week-0), week-6, and post training (week-10). The results of our study were that after 10 weeks of PRI training, vertical jump, running vertical jump, 30-m sprint time and maximal strength by squat-test were significantly higher with respect to pre-training (p<0.05). In TR group, maximal strength by squatting test was significantly increased compared with pre-training (p<0.05), while no significantly changes were observed for the other power tests. There were no significantly changes in GH, IGF-1, testosterone, cortisol, and T/C ratio during the 10-week training period in both groups. The data indicated that PRI and traditional resistances training have similar hormonal states. The PRI training significantly increased power and strength performance.
被動反覆衝擊式訓練(Passive Repetitive Isokinetic Training；PRI)主要是依據伸展縮短循環(Stretch-Shortening-Cycle)特性所發展出的一種訓練肌力和爆發力的器材，然而PRI訓練對訓練效果及人體體內荷爾蒙的影響，尚無相關的實驗數值來證實。因此，本研究目的在探討PRI訓練前後安靜期血液中荷爾蒙之變化及肌力與爆發力等運動表現的影響。研究中共有19名受試者，隨機分為PRI訓練組(n=10)及傳統蹲舉訓練組(TR；n=9)，進行每週三次共10週之訓練，並於訓練前、訓練第6週及訓練後分別進行安靜時的血液採集，分析安靜時血液中生長激素(Growth hormone；GH)、類胰島素生長因子(Insulin-likc growth factor)、睪固酮(Testosterone)及皮質醇(Cortisol)的濃度我於訓練前後進行肌力及爆發力測試，結果發現：PRI組其肌力及爆發力表現在訓練後顯著的提升，而TR組僅增加最大肌力，兩組間以變化百分比進行比較：PRI在肌力及爆發力的變化百分比皆顯著高於TR組。血液荷爾蒙的結果：第6週和第10週時之安靜生長激素、類胰島素生長因子、睪固酮及皮質醇的濃度，組內訓練前後相比並無顯著性的改變；PRI組與TR組兩組間安靜期的荷爾蒙濃度反應亦無差異。由本研究得知：為期10週之PRI訓練能有效的提升肌力以及爆發力之運動表現，然而安靜期的荷爾蒙於訓練前、中、後並無顯著的變化。
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