等长阶梯式和斜坡式肌肉动作过程中肌机械图幅度和平均功率频率的可靠性。
Reliability of mechanomyographic amplitude and mean power frequency during isometric step and ramp muscle actions.
作者信息
Herda Trent J, Ryan Eric D, Beck Travis W, Costa Pablo B, DeFreitas Jason M, Stout Jeffrey R, Cramer Joel T
机构信息
Department of Health and Exercise Science, University of Oklahoma, Norman, OK 73019-6081, USA.
出版信息
J Neurosci Methods. 2008 Jun 15;171(1):104-9. doi: 10.1016/j.jneumeth.2008.02.017. Epub 2008 Mar 8.
This study examined the reliability of mechanomyographic amplitude (MMG RMS) and mean power frequency (MMG MPF) for the vastus lateralis during isometric maximal voluntary contractions (MVCs) and submaximal step and ramp muscle actions of the leg extensors. Nineteen participants (mean+/-S.D. age=24+/-4 yrs) performed two isometric MVCs, 10 randomly ordered isometric step muscle actions at 5, 15, 25, 35, 45, 55, 65, 75, 85, and 95% of MVC, and two 6s isometric ramp muscle actions during 3 trials separated by 3-5 days. The intraclass correlation coefficient (ICC), standard error of the measurement (SEM), and minimal difference (MD) were used for test-retest reliability, while repeated measures ANOVAs were used to quantify systematic variability. Systematic variability was only present across the 3 trials at 5% MVC during the step muscle action for MMG RMS and at 35% of MVC during the ramp muscle action for MMG MPF. The ICCs ranged from 0.39 to 0.89 and 0.36 to 0.80, while the SEM (% of mean) ranged from 14.9 to 33.9% and 6.9 to18.9% for MMG RMS and MMG MPF, respectively. Thus, MMG RMS and MMG MPF demonstrated reliability that was comparable to that of the surface electromyographic signal.
本研究考察了在等长最大自主收缩（MVC）以及腿部伸肌的次最大阶梯和斜坡肌肉动作过程中，股外侧肌肌机械图振幅（MMG RMS）和平均功率频率（MMG MPF）的可靠性。19名参与者（平均±标准差年龄 = 24±4岁）进行了两次等长MVC、10次随机排序的等长阶梯肌肉动作（强度为MVC的5%、15%、25%、35%、45%、55%、65%、75%、85%和95%），以及两次6秒的等长斜坡肌肉动作，共进行3组试验，每组试验间隔3 - 5天。组内相关系数（ICC）、测量标准误差（SEM）和最小差异（MD）用于检验重测可靠性，而重复测量方差分析用于量化系统变异性。对于MMG RMS，仅在阶梯肌肉动作中5%MVC时的3组试验间存在系统变异性；对于MMG MPF，仅在斜坡肌肉动作中35%MVC时的3组试验间存在系统变异性。MMG RMS的ICC范围为0.39至0.89，MMG MPF的ICC范围为0.36至0.80；MMG RMS的SEM（均值的百分比）范围为14.9%至33.9%，MMG MPF的SEM范围为6.9%至18.9%。因此，MMG RMS和MMG MPF表现出与表面肌电信号相当的可靠性。
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