Gradual potentiation of isometric muscle force during constant electrical stimulation

Gradual potentiation of isometric muscle force during constant electrical stimulation
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持续电刺激期间等长肌力逐渐增强

DOI:
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发表时间:
2006
影响因子:
3.2
通讯作者:
G. Khang
G. Khang
中科院分区:
工程技术3区
文献类型:
--
作者:
G. Eom;Takashi Watanabe;N. Hoshimiya;G. Khang

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研究了刺激频率和刺激历史对等长条件下持续刺激两膝伸肌20s时肌力增强的影响。刺激频率显著影响增强模式:低频(2.5~10 Hz)刺激后力值先减小后增强,高频(14.3~25 Hz)刺激仅显示力值增强。随着刺激频率的增加,力觉增强的程度和达峰时间逐渐减小。条件刺激(40 Hz和14.3 Hz)可使肌力显著增加85%以上,而短暂休息后的主刺激(14.3 Hz,分别为10个S和50个S)对肌力的增强作用不明显(均在8%以下)。特别是,当条件刺激的频率为14.3 Hz时,主刺激的初始力与条件刺激的终力值非常相似(相似性在90%以上)。静息状态下,增强后的扭体力缓慢衰减,平均时间常数为2.4min。这些观察表明,肌肉增强依赖于刺激频率和刺激历史,因此,增强的计算机模型可以在预测电刺激引起的肌力和身体运动方面发挥重要作用。
An investigation was carried out into how stimulation frequency and stimulation history affect the potentiation of muscle force during 20s of constant stimulation of the two knee extensors in isometric conditions. Stimulation frequency significantly affected the potentiation pattern: low-frequency (2.5–10 Hz) stimulation showed a reduction and subsequent enhancement of force, and high-frequency (14.3–25 Hz) stimulation showed only enhancement of force. The degree of enhancement in force and time-to-peak decreased with the stimulation frequency. Whereas conditioning stimulation (both 40 Hz and 14.3 Hz) significantly enhanced the muscle force above 85%, following main stimulation (14.3 Hz) after short rest (10 s and 50 s, respectively) induced little force enhancement (below 8%). In particular, when the frequency of the conditioning stimulation was 14.3 Hz, the initial force at the main stimulation showed a very similar value to the final force value of the conditioning stimulation (above 90% similarity). The potentiated twitch force slowly decayed during rest, with an average time constant of 2.4 min. These observations indicate that muscle potentiation depends on the stimulation frequency and stimulation history, and therefore a computer model of potentiation can play an important role in predicting muscle force and body movement induced by electrical stimulation.
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