Ohtsuki T
Behav Brain Res. 1983 Feb;7(2):165-78. doi: 10.1016/0166-4328(83)90190-0.
Human voluntary isometric maximum muscle strength during simultaneous bilateral versus separate unilateral elbow extension and flexion was measured. The following results were obtained. (1) Strength was reduced under the condition of simultaneous bilateral exertion of contralateral corresponding muscles as compared to the unilateral condition. (2) The decrease ratio of strength was 24.6 and 18.8% for the right and left for extension and 6.3 and 7.6% for the right and left for flexion. The extension-flexion difference was statistically significant but right-left difference was not significant. (3) Integrated EMG showed the tendency comparable to the strength and high correlation was found between strength and integrated EMG. (4) Decrease ratio was reduced when extension of one arm and flexion of the other arm was simultaneously performed. (5) Possible mechanisms subserving these findings were postulated and discussed.
测量了人类在双侧同时与单侧分别进行肘部伸展和屈曲时的自愿等长最大肌肉力量。得到了以下结果。（1）与单侧情况相比，在对侧相应肌肉双侧同时用力的情况下力量降低。（2）伸展时右侧和左侧的力量下降率分别为24.6%和18.8%，屈曲时右侧和左侧分别为6.3%和7.6%。伸展-屈曲差异具有统计学意义，但左右差异不显著。（3）积分肌电图显示出与力量相当的趋势，并且在力量与积分肌电图之间发现了高度相关性。（4）当一只手臂伸展而另一只手臂屈曲同时进行时，下降率降低。（5）推测并讨论了支持这些发现的可能机制。
