人类随意收缩疲劳时运动神经元放电频率减慢的反射起源。
Reflex origin for the slowing of motoneurone firing rates in fatigue of human voluntary contractions.
作者信息
Bigland-Ritchie B R, Dawson N J, Johansson R S, Lippold O C
出版信息
J Physiol. 1986 Oct;379:451-9. doi: 10.1113/jphysiol.1986.sp016263.
Abstract
During fatigue from a sustained maximal voluntary contraction (m.v.c.) the mean motoneurone discharge rates decline. In the present experiments we found no recovery of firing rates after 3 min of rest if the fatigued muscle was kept ischaemic, but near full recovery 3 min after the blood supply was restored. Since 3 min is thus sufficient time for recovery of any central changes in excitability, the results support the hypothesis that, during fatigue, motoneurone firing rates may be regulated by a peripheral reflex originating in response to fatigue-induced changes within the muscle.
摘要
在持续最大自主收缩（m.v.c.）导致疲劳期间，运动神经元的平均放电率会下降。在本实验中，我们发现，如果使疲劳的肌肉保持缺血状态，休息3分钟后放电率不会恢复，但恢复血液供应3分钟后接近完全恢复。由于3分钟足以使兴奋性的任何中枢变化得以恢复，因此这些结果支持以下假设：在疲劳期间，运动神经元放电率可能受源于肌肉内疲劳诱导变化的外周反射调节。
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