Styf J, Ballard R, Aratow M, Crenshaw A, Watenpaugh D, Hargens A R
Life Science Division, NASA Ames Research Center, Moffett Field, California, USA.
Scand J Med Sci Sports. 1995 Oct;5(5):291-6. doi: 10.1111/j.1600-0838.1995.tb00047.x.
Intramuscular pressures, electromyography (EMG) and torque generation during isometric, concentric and eccentric maximal isokinetic muscle activity were recorded in 10 healthy volunteers. Pressure and EMG activity were continuously and simultaneously measured side by side in the tibialis anterior and soleus muscles. Ankle joint torque and position were monitored continuously by an isokinetic dynamometer during plantar flexion and dorsiflexion of the foot. The increased force generation during eccentric muscular activity, compared with other muscular activity, was not accompanied by higher intramuscular pressure. Thus, this study demonstrated that eccentric muscular activity generated higher torque values for each increment of intramuscular pressure. Intramuscular pressures during antagonistic co-activation were significantly higher in the tibilis anterior muscle (42-46% of maximal agonistic activity) compared with the soleus muscle (12-29% of maximal agonistic activity) and was largely due to active recruitment of muscle fibers. In summary, eccentric muscular activity creates higher torque values with no additional increase of the intramuscular pressure compared with concentric and isometric muscular activity.
在10名健康志愿者身上记录了等长、向心和离心最大等速肌肉活动期间的肌内压力、肌电图（EMG）和扭矩产生情况。在胫骨前肌和比目鱼肌中同时连续并排测量压力和EMG活动。在足部跖屈和背屈过程中，通过等速测力计连续监测踝关节扭矩和位置。与其他肌肉活动相比，离心肌肉活动中力量产生的增加并未伴随着更高的肌内压力。因此，本研究表明，对于每一次肌内压力的增加，离心肌肉活动都会产生更高的扭矩值。与比目鱼肌（最大主动收缩活动的12 - 29%）相比，胫骨前肌在拮抗肌共同激活期间的肌内压力显著更高（最大主动收缩活动的42 - 46%），这主要归因于肌肉纤维的主动募集。总之，与向心和等长肌肉活动相比，离心肌肉活动在不额外增加肌内压力的情况下产生更高的扭矩值。
