Department of Human Physiology, University of Oregon, Eugene, OR, United States.
Department of Human Physiology, University of Oregon, Eugene, OR, United States.
J Biomech. 2022 Mar;134:111014. doi: 10.1016/j.jbiomech.2022.111014. Epub 2022 Feb 19.
There are a number of ways to normalize electromyographical data, the most common of which is using a maximal contraction as a reference. However, this technique is not always practical. The purpose of the present study was to assess the reliability of an electromyographical data normalization technique using standardized submaximal contractions. Twenty healthy subjects (ten male, ten female) were used for testing, which was performed using both surface and fine-wire electromyography over two sessions at 15, 30, 45, and 60 percent of the day 1 maximum force. There was a mean of 5.3 days between test days. Data were compared between days, and the resulting ICC and standard error of the measurement values indicate varying levels of reliability at each submaximal percent. All heads of the deltoid, the upper trapezius and the serratus anterior demonstrated good reliability for at least one submaximal condition. The latissimus dorsi and supraspinatus demonstrated moderate reliability for at least one submaximal condition. Finally, the infraspinatus demonstrated poor reliability under all conditions. For situations in which MVC is impractical or anticipated to change, EMG amplitude normalization to one of these submaximal percentages appears to be a viable technique, at least for most muscles.
有许多方法可以对肌电图数据进行归一化，其中最常用的方法是使用最大收缩作为参考。然而，这种技术并不总是实用的。本研究的目的是评估使用标准化次最大收缩进行肌电图数据归一化技术的可靠性。二十名健康受试者（男 10 名，女 10 名）用于测试，在第一次最大力的 15%、30%、45%和 60%的情况下，分别在两次会议上使用表面和细针肌电图进行测试，两次测试之间的平均间隔为 5.3 天。对每天的数据进行比较，ICC 和测量值的标准误差值表明，在每个次最大百分比下的可靠性水平不同。三角肌、上斜方肌和前锯肌的所有头部在至少一种次最大条件下表现出良好的可靠性。背阔肌和冈上肌在至少一种次最大条件下表现出中度可靠性。最后，冈下肌在所有条件下均表现出较差的可靠性。对于最大收缩不可行或预计会发生变化的情况，将肌电图幅度归一化为这些次最大百分比之一似乎是一种可行的技术，至少对大多数肌肉是如此。
