FATIGUE-RELATED CHANGES IN MOTOR UNIT ACTION-POTENTIALS OF ADULT CATS
FATIGUE-RELATED CHANGES IN MOTOR UNIT ACTION-POTENTIALS OF ADULT CATS
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DOI：
10.1002/mus.880150204
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发表时间：
1992-02-01
期刊：
影响因子：
3.4
通讯作者：
STUART, DG
中科院分区：
文献类型：
--
作者：
ENOKA, RM;TRAYANOVA, N;STUART, DG
这项研究的目的是量化在标准运动单位疲劳测试中运动单位动作电位(MUAP)和力量的变化。MUAP波形的特征是测量幅度、持续时间、面积和形状(如比例系数所反映的)。抗疲劳的运动单位在疲劳测试期间的MUAP幅度和面积表现出微小的，但在统计学上显著的变化，而疲劳的运动单位在MUAP幅度、持续时间和面积方面表现出不同的变化。对于所有类型的运动单元，比例系数没有变化，因此MUAP面积的变化与幅度和持续时间的综合变化成正比。对于耐疲劳和易疲劳的发动机单元，MUAP在列车之间和列车内的变化也是明显的。尽管随着疲劳试验的进行，MUAP的变化可能有几种机制，但MUAP和力的时间历程的分离表明，这些MUAP的变化不是在这些条件下力下降的主要原因。
The purpose of this study was to quantify the changes in motor-unit action potentials (MUAP) and force during a standard motor-unit fatigue test. MUAP waveforms were characterized by the measurement of amplitude, duration, area, and shape (as reflected in a coefficient of proportionality). Fatigue-resistant motor units exhibited small, but statistically significant, changes in MUAP amplitude and area during the fatigue test, whereas fatigable motor units displayed variable changes in MUAP amplitude, duration, and area. For all motor-unit types, the coefficient of proportionality did not change, and hence the change in MUAP area was proportional to the combined changes in amplitude and duration. The between- and within-train changes in MUAP were also distinct for the fatigue-resistant and fatigable motor units. Although several mechanisms could be responsible for the changes in the MUAP as the fatigue test proceeded, the dissociation of the time courses for MUAP and force indicated that these MUAP changes were not the principal reason for the decline in force under these conditions.