F-WAVES AND MOTOR UNIT SIZE
F-WAVES AND MOTOR UNIT SIZE
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DOI：
10.1002/mus.880151013
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发表时间：
1992-10-01
期刊：
影响因子：
3.4
通讯作者：
WOLF, W
中科院分区：
文献类型：
--
作者：
DENGLER, R;KOSSEV, A;WOLF, W
肌内微刺激运动轴突可引起第一背骨间肌单运动单位的M反应和抽搐收缩。在21名受试者中研究了299mu。35个MUs（17%）除M波外还表现为F波。抽动力是衡量MU大小的间接指标；此外，测量抽搐收缩时间。对于上述收缩参数，没有产生F波的MUs组。然而，具有非常高的抽搐力（超过70 mN）的5个mu中有4个产生F波。我们得出结论，所有大小的mu以相似的概率产生F波。只有少数具有非常强的抽动力的mu，即非常大的mu，可能更容易产生F波，并可能参与所谓的中继器F波的产生。
M responses and twitch contractions were evoked in single motor units (MUs) of the first dorsal interosseus muscle by intramuscular microstimulation of motor axons. Two-hundred nine MUs were studied in 21 subjects. Thirty-five MUs (17%) showed F waves in addition to M responses. Twitch force was used to provide an indirect measure of MU size; additionally, twitch contraction time was measured. There was no select group of MUs generating F waves with regard to the above contraction parameters. However, four of five MUs with very high twitch forces, above 70 mN, generated F waves. We conclude that MUs of all sizes produce F waves with similar probability. Only few MUs with very strong twitch forces, i.e., very large MUs, may be more subject to F-wave production and may be involved in the generation of the so-called repeater F waves.