RELATIONSHIP BETWEEN FORCE AND INTEGRATED EMG ACTIVITY DURING VOLUNTARY ISOMETRIC ANISOTONIC CONTRACTION
RELATIONSHIP BETWEEN FORCE AND INTEGRATED EMG ACTIVITY DURING VOLUNTARY ISOMETRIC ANISOTONIC CONTRACTION
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DOI：
10.1007/bf00428870
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发表时间：
1981-01-01
影响因子：
3
通讯作者：
CASSAR, G
中科院分区：
文献类型：
--
作者：
METRAL, S;CASSAR, G
记录了正常人桡侧腕伸肌在随意等长各向同性收缩时的表面肌电(EMG)和肌肉产生的力。力[F]与瞬时积分肌电[IEMG]之间的关系不能用单一的线性函数或抛物线来拟合。然后，肌肉被认为是一个呈现最大力的系统，其中EMG活动代表输入和输出的收缩力量，即F=f(IEMG)，而不是通常所做的IEMG=f(F)。使用收缩开始时的总和IEMG，因为实际力量取决于所有前面的事件。这些发现导致了对将F与IEMG联系起来的非线性和渐近函数的测试。一个双指数函数可以解释两种机制，通过它可以增加自愿收缩的力量。
The surface electromyogram (EMG) was recorded for the extensor carpi radiales of normal human subjects during voluntary isometric anisotonic contractions and the force generated by the muscle. The relationship between force [F] and instantaneous integrated EMG [iEMG] could not be fitted by a single linear function or a parabola. The muscle was then considered as a system presenting a maximum force and in which the EMG activity represented the input and the contraction force the output, i.e., F = f(iEMG) and not, as is usually done, iEMG = f(F). The summed iEMG from the beginning of the contraction was used since the actual force depends on all preceding events. These findings led to testing for a non-linear and asymptotic function relating F to iEMG. A double exponential function could account for the 2 mechanisms by which the force of a voluntary contraction is increased.