Acoustic myography for investigating human skeletal muscle fatigue.
Acoustic myography for investigating human skeletal muscle fatigue.
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用于研究人体骨骼肌疲劳的声学肌动描记法。
DOI：
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发表时间：
1991
影响因子：
3.3
通讯作者：
P. Dalton
中科院分区：
文献类型：
--
作者：
M. Stokes;P. Dalton
本文用声学肌电图（AMG）对5名健康成人股四头肌等长收缩时所产生的声音进行了研究。受试者坐下后，在股直肌上记录等长力、表面肌电图（EMG）和AMG，并将EMG和AMG信号进行积分（IEMG和IAMG）。以最大随意收缩（MVC）力的10、25、50、60、75和100%进行持续5 s的收缩。然后通过在75%MVC下重复自主收缩（10 s on，10 s off）诱导疲劳，直到仅能维持40%MVC。休息15分钟后，再次测试与新鲜MVC相关的不同力水平。疲劳活动前后，力与IEMG（r = 0.99 ± 0.01（SD），n = 10）和IAMG（r = 0.98 ± 0.02）均呈线性关系。活动后，力和IEMG的回归线斜率增加（P <0.01），而力和IAMG的回归线斜率保持不变（P> 0.05）。目前的研究结果澄清了AMG和等长收缩力在疲劳肌肉中的关系，没有疲劳引起的震颤的问题，这阻碍了以前的研究长期活动。这项研究有助于验证AMG，并表明它是一个潜在的有用的方法，无创评估力的产生和疲劳。在AMG被接受用于神经肌肉生理学或康复之前，需要进一步研究以确定AMG活性的来源。
Sounds produced during voluntary isometric contractions of the quadriceps muscle were studied by acoustic myography (AMG) in five healthy adults. With the subject seated, isometric force, surface electromyography (EMG), and AMG were recorded over rectus femoris, and the EMG and AMG signals were integrated (IEMG and IAMG). Contractions lasting 5 s each were performed at 10, 25, 50, 60, 75, and 100% of maximum voluntary contraction (MVC) force. Fatigue was then induced by repeated voluntary contractions (10 s on, 10 s off) at 75% MVC until only 40% MVC could be sustained. After 15 min of rest, the different force levels were again tested in relation to the fresh MVC. Both before and after fatiguing activity the relationships between force and IEMG [r = 0.99 +/- 0.01 (SD), n = 10] and force and IAMG (r = 0.98 +/- 0.02) were linear. After activity, however, the slopes of the regression lines for force and IEMG increased (P less than 0.01) but those for force and IAMG remained the same (P greater than 0.05). The present results clarify the relationship between AMG and isometric force in fatigued muscle without the problem of fatigue-induced tremor, which hampered previous studies of prolonged activity. This study contributes to the validation of AMG and shows that it is a potentially useful method for noninvasive assessment of force production and fatigue. Further studies to establish the origin of AMG activity are required before AMG can be accepted for use in neuromuscular physiology or rehabilitation.