ISOMETRIC FORCE PRODUCTION BY MOTOR UNITS OF EXTENSOR DIGITORUM COMMUNIS MUSCLE IN MAN
ISOMETRIC FORCE PRODUCTION BY MOTOR UNITS OF EXTENSOR DIGITORUM COMMUNIS MUSCLE IN MAN
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DOI：
10.1152/jn.1977.40.6.1432
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发表时间：
1977-01-01
影响因子：
2.5
通讯作者：
CHAN, H
中科院分区：
文献类型：
--
作者：
MONSTER, AW;CHAN, H
记录了人中指伸肌等长收缩过程中各运动单位的放电频率和大小。结果显示，在相对于单位大小的单位招聘阈值和相对于总肌肉力量和单位大小的单位放电率方面，运动单位群体有系统的组织。成对的同时记录homomorphic单位保持其放电率的关系随着时间的推移，自愿等长收缩的强度缓慢变化。较大的单位在较高的部队招募水平比较小的单位和较大的单位增加了他们的射击率更快比较小的单位，一旦招募。这种系统的单位行为提供了一种间接的手段，估计整个肌肉的运动单位组成的基础上，对一个相对较小的选定数量的单位的观察。单位的大小，发射率，组成和单位的收缩反应的数据完成了自愿部队生产过程的功能模型。该模型适用于各种比较研究。
The firing rates and sizes of motor units of the human middle finger extensor (digitorum communis) muscle were recorded during steady voluntary isometric contractions. The results displayed a systematic organization of the motor unit population in terms of unit recruitment thresholds relative to unit size and of unit firing rates relative to total muscle force and unit size. Pairs of simultaneously recorded homonymous units maintained their firing rate relationships over time when voluntary isometric contractions were slowly varied in strength. Larger units were recruited at higher force levels than smaller units and larger units increased their firing rates more rapidly than smaller units, once recruited. This systematic unit behavior provided for an indirect means of estimating the motor unit composition of the whole muscle, on the basis of observations on a relatively small selected number of units. Data on unit sizes, firing rates, composition and the contractile response of units completed a functional model of the voluntary force production process. This model was suitable for a wide variety of comparative studies.