Ikegawa Shigeki, Funato Kazuo, Tsunoda Naoya, Kanehisa Hiroaki, Fukunaga Tetsuo, Kawakami Yasuo
Faculty of Human Health Science, Tokyo Metropolitan University, Tokyo, Japan.
J Strength Cond Res. 2008 Jan;22(1):128-31. doi: 10.1519/JSC.0b013e31815f2fd3.
The present study aimed to examine the effect of pennation angle on the force per cross-sectional area for elbow extensor muscles in strength-trained athletes. A total of 52 male bodybuilders (n = 32) and Olympic weightlifters (n = 20) did maximal isometric elbow extension on an isokinetic dynamometer. Muscle cross-sectional area (CSA) and muscle-fiber pennation angle (PA) of the triceps brachii muscles were measured by ultrasonography. Bodybuilders had significantly greater isometric elbow extension force (F), CSA and PA than weightlifters. The ratio of force to CSA (F/CSA) of bodybuilders was significantly lower than that of weightlifters. A significant positive correlation was observed between CSA and PA in both groups (r = 0.832, P < 0.001, and r = 0.682, P < 0.001, for bodybuilders and weightlifters, respectively). The F/CSA was negatively correlated to PA both for bodybuilders (r = -0.408, P < 0.05) and weightlifters (r = -0.465, P < 0.05). Thus present study indicates that the larger pennation angle is associated with the lower force relative to muscle CSA in strength-trained athletes.
本研究旨在探讨在力量训练的运动员中，羽状角对肘伸肌每横截面积力量的影响。共有52名男性健美运动员（n = 32）和奥运会举重运动员（n = 20）在等速测力计上进行最大等长伸肘动作。通过超声测量肱三头肌的肌肉横截面积（CSA）和肌纤维羽状角（PA）。健美运动员的等长伸肘力量（F）、CSA和PA显著大于举重运动员。健美运动员的力量与CSA之比（F/CSA）显著低于举重运动员。两组中CSA和PA之间均观察到显著的正相关（健美运动员r = 0.832，P < 0.001；举重运动员r = 0.682，P < 0.001）。健美运动员和举重运动员的F/CSA均与PA呈负相关（健美运动员r = -0.408，P < 0.05；举重运动员r = -0.465，P < 0.05）。因此，本研究表明，在力量训练的运动员中，较大的羽状角与相对于肌肉CSA较低的力量相关。
