Dickin D Clark, Too Danny
Department of Health, Physical Education, Recreation, and Dance, University of Idaho, Moscow 83844-2301, USA.
Res Q Exerc Sport. 2006 Sep;77(3):296-303. doi: 10.1080/02701367.2006.10599363.
Department of Health, Physical Education, Recreation, and Dance at the University of Idaho. This study was performed to examine the effects of movement velocity and maximal concentric and eccentric actions on the bilateral deficit. Eighteen female participants performed maximal unilateral and bilateral knee extensions concentrically and eccentrically across six movement velocities (30, 60, 90, 120, 150, and 180 degrees/s). Repeated measures analyses of variance revealed significant differences (p < .025) between bilateral and summed unilateral contractions both concentrically and eccentrically at each velocity tested. Post hoc analyses revealed that the degree of bilateral deficit increased as movement velocity increased for concentric actions (e.g., 17-33% deficit, for 30 and 180 degrees/s, respectively), and an increasing trend was seen for eccentric actions (e.g., 18-25% deficit, for 30 and 180 degrees/s, respectively). These findings suggest that with increased velocity, a decreased or incomplete activation of fast twitch muscle fibers may have occurred in bilateral actions when compared to unilateral actions.
爱达荷大学健康、体育、娱乐与舞蹈系。本研究旨在考察运动速度以及最大向心和离心动作对双侧 deficit 的影响。18 名女性参与者以六种运动速度（30、60、90、120、150 和 180 度/秒）进行了最大单侧和双侧膝关节伸展的向心和离心动作。重复测量方差分析显示，在每个测试速度下，双侧收缩与单侧收缩总和在向心和离心动作方面均存在显著差异（p <.025）。事后分析表明，对于向心动作，双侧 deficit 的程度随运动速度增加而增加（例如，分别在 30 和 180 度/秒时 deficit 为 17 - 33%），对于离心动作也有增加趋势（例如，分别在 30 和 180 度/秒时 deficit 为 18 - 25%）。这些发现表明，随着速度增加，与单侧动作相比，双侧动作中快肌纤维的激活可能减少或不完全。
