EMG activities and ground reaction forces during fatigued and nonfatigued sprinting.
EMG activities and ground reaction forces during fatigued and nonfatigued sprinting.
复制标题
疲劳和非疲劳冲刺期间的肌电图活动和地面反作用力。
DOI：
10.1249/00005768-199405000-00013
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发表时间：
1994
影响因子：
4.1
通讯作者：
A. Mero
中科院分区：
文献类型：
--
作者：
A. Nummela;H. Rusko;A. Mero
本研究旨在探讨疲劳和非疲劳跑步过程中的肌电活动和地面反作用力。10名男子短跑运动员自愿参加最高20米速度测试、400米计时赛和次最高20米跑，平均速度为400米的前100米。在每次跑步的后期，记录地面反作用力和四条腿肌肉的EMG活动。EMG活动的时间平均在三个阶段的运行：预激活，制动和推进阶段。制动阶段（P < 0.001）和推进阶段（P < 0.01）的地面反作用力在最大和次大20 m时均大于400 m结束时。制动相（P < 0.01）和着地相（P < 0.05）的平均肌电在次极量20 m时小于400 m末。最大20 m时的平均肌电值在推进阶段（P < 0.001）和整个着地阶段（P < 0.05）均高于400 m时的平均肌电值。此外，前活动越大，400m跑制动阶段地面反力下降越小（r = 0.77，P < 0.05）。结果表明，400 m跑中神经激活增加的作用是补偿肌肉疲劳，而预激活在维持力量产生方面具有重要作用。此外，各工作肌的疲劳程度不同。
The present study was designed to investigate EMG activities and ground reaction forces during fatigued and nonfatigued running. Ten male sprint runners volunteered to run a maximal 20-m speed test, a 400-m time trial, and submaximal 20-m runs at the average speed of the first 100 m of the 400 m. During the latter stage of each run, ground reaction forces and EMG activity of four leg muscles were recorded. EMG activities were time averaged during three phases of running: preactivation, braking, and propulsion phase. The resultant ground reaction forces both in the braking (P < 0.001) and in the propulsion phase (P < 0.01) were greater in the maximal and submaximal 20 m than at the end of the 400 m. The averaged EMG during the braking phase (P < 0.01) and during the total ground phase (P < 0.05) was smaller in the submaximal 20 m than at the end of the 400 m. On the other hand the averaged EMG was greater during the maximal 20 m than at the end of the 400 m during the propulsion phase (P < 0.001) and during the total ground phase (P < 0.05). In addition, the more the preactivity increased the less the resultant ground reaction force decreased in the braking phase during the 400 m run (r = 0.77, P < 0.05). It was concluded that the role of the increased neural activation was to compensate for muscular fatigue and the preactivation had an important role in maintaining force production during the 400-m run. In addition, the fatigue was different in each working muscle.