RESPONSES OF HUMAN MUSCLE-SPINDLE ENDINGS TO VIBRATION OF NON-CONTRACTING MUSCLES
RESPONSES OF HUMAN MUSCLE-SPINDLE ENDINGS TO VIBRATION OF NON-CONTRACTING MUSCLES
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DOI：
10.1113/jphysiol.1976.sp011580
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发表时间：
1976-01-01
影响因子：
5.5
通讯作者：
WALLIN, BG
中科院分区：
文献类型：
--
作者：
BURKE, D;HAGBARTH, KE;WALLIN, BG
本文用微电极记录人腓神经和胫神经的32个初级纺锤体末梢、13个次级纺锤体末梢和3个高尔基体腱器在小腿受器肌腱振动时的反应。所施加的振动的振幅为1.5 mm，并且频率在20-220 Hz之间变化。如用EMG和扭矩测量所检查的，腿部的肌肉在分析的序列期间被放松。假设振动器被准确地应用，所有的末端响应于与振动周期相位锁定的放电，放电速率处于振动频率或该频率的次谐波。对振动的反应是突然发作和抵消，保持振动的持续时间，并没有受到波动与注意力的变化或远程肌肉收缩。最大放电率，可以实现从1结束到下一个变化，并增加与受体轴承肌肉的长度。对于驱动在其最大速率的振动频率的增加产生的放电率减少的结束改变为一个次谐波模式的响应。振动频率越低，则匡威。对于任何给定的肌肉长度，初级末梢通常可以被驱动到比次级末梢更高的速率，但是每组内的响应范围很广，并且组之间有显著的重叠。在中等肌肉长度的最敏感的初级末梢可以驱动到220赫兹，但次级末梢没有达到放电率高于100赫兹。结合振动和被动运动，初级末梢在拉伸阶段表现出最大的振动响应，有时每个振动周期发射两次。在缩短阶段，他们通常停止响应振动刺激。次级末梢的振动反应性没有增强到相同程度的持续肌肉拉伸或减少到相同程度的持续肌肉缩短。在缩短的过程中，次级末梢可能比初级末梢更敏感。在肌肉振动过程中，初级末梢对肌腱水龙头的反应减少，这可能有助于振动引起的抑制肌腱痉挛。由于肌腱敲击后肌肉缩短，对振动的反应出现短暂停顿。
In microelectrode recordings from the human peroneal and tibial nerves, the responses of 32 primary spindle endings, 13 secondary spindle endings and 3 Golgi tendon organs were studied during vibration of the tendons of the receptor-bearing muscles in the leg. The amplitude of the applied vibration was 1.5 mm, and the frequency was varied from 20-220 Hz. As checked with EMG and torque measurements, the muscles of the leg were relaxed during the sequences analyzed. Providing that the vibrator was accurately applied, all endings responded with discharges phase-locked to the vibration cycles, the discharge rates being at the vibration frequency or at subharmonics of that frequency. The response to vibration was of abrupt onset and offset, was maintained for the duration of vibration and was not subject to fluctuation with changes in attention or with remote muscle contraction. The maximal discharge rate that could be achieved varied from 1 ending to the next and increased with the length of the receptor-bearing muscle. For endings driven at their maximal rate an increase in vibration frequency produced a decrease in discharge rate as the ending changed to a subharmonic pattern of response. The converse occurred on decreasing vibration frequency. For any given muscle length primary endings could generally be driven to higher rates than secondary endings, but there was a wide range of responsiveness within each group and a significant overlap between the groups. At medium muscle length the most responsive primary endings could be driven up to 220 Hz, but secondary endings did not reach discharge rates higher than 100 Hz. With combined vibration and passive movements, primary endings exhibited maximal vibration responsiveness during the stretching phases, sometimes firing twice per vibration cycle. During the shortening phases they usually ceased responding to the vibratory stimulus. The vibration responsiveness of secondary endings was not potentiated to the same extent by on-going muscle stretch or reduced to the same extent by on-going muscle shortening. During shortening, secondary endings may be more responsive than primary endings. The responses of primary endings to tendon taps were reduced during muscle vibration, a reduction which probably contributes to vibration-induced suppression of tendon jerks. As the muscle shortened after tendon percussion, there was a transient pause in the response to vibration.