The reliability of electromechanical delay and torque during isometric and concentric isokinetic contractions
The reliability of electromechanical delay and torque during isometric and concentric isokinetic contractions
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DOI：
10.1016/j.jelekin.2008.02.002
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发表时间：
2009-10-01
影响因子：
2.5
通讯作者：
van Someren, Ken A.
中科院分区：
文献类型：
--
作者：
Howatson, Glyn;Glaister, Mark;van Someren, Ken A.
本研究的目的是检查在连续五天重复的等长和等速肌肉收缩过程中，优势和非优势肘屈肌的机电延迟（EMD）和扭矩的受试者内可靠性。11名不熟悉等速测力法的志愿者参加了这项研究，并被要求连续5天参加实验室。使用等速测力计在等长、慢速（60 ° s（-1））和快速（210 ° s（-1））等速条件下手肘屈肌;从肱二头肌腹部记录表面肌电图，并将信号与测力计同步以确定EMD。所有测量的受试者内可靠性良好（CV范围，3.1-6.5%），在等长和等速条件下，优势臂和非优势臂之间无明显差异。此外，在EMD和扭矩变异性之间的优势和非优势的手臂，可能有临床医生和未来的研究设计时，监测和调查人体肌肉功能的应用程序几乎没有什么区别。这些数据为研究人员和临床医生提供了一个变化幅度的指示，需要阐明手肘屈肌肌肉功能的有意义的变化的存在。(C)2008爱思唯尔有限公司保留所有权利。
The purpose of this investigation was to examine the intra-subject reliability of electromechanical delay (EMD) and torque of the dominant and non-dominant elbow flexors during isometric and isokinetic muscle contractions repeated over five consecutive days. Eleven volunteers that were unfamiliar with isokinetic dynamometry participated in this study and were asked to attend the laboratory on five consecutive days. An isokinetic dynamometer was used to exercise the elbow flexors under isometric, slow (60 degrees s(-1)) and fast (210 degrees s(-1)) isokinetic conditions; surface electromyography was recorded from the belly of biceps brachii and the signal was synchronised with the dynamometer to determine EMD. Intra-subject reliability for all measures was good (CV range, 3.1-6.5%) with no discernable difference between the dominant and non-dominant arms during isometric and isokinetic conditions. In addition, there was little difference in EMD and torque variability between the dominant and non-dominant arms which may have applications for clinicians and future research design when monitoring and investigating human muscle function. These data provide researchers and clinicians with an indication of the magnitude of change that is required to elucidate the presence of a meaningful change to muscle function in the elbow flexors. (C) 2008 Elsevier Ltd. All rights reserved.