Kraydich Matthew J, Gonzalez Jacob, Ziebold Marcus A, Asmar Patrick N, Chehab Amanda, Malek Moh H
Physical Therapy Program, Department of Health Care Sciences, Wayne State University, College of Pharmacy and Health Sciences, Detroit, MI 48201, USA.
Integrative Physiology of Exercise Laboratory, Department of Health Care Sciences, Wayne State University, College of Pharmacy and Health Sciences, Detroit, MI 48201, USA.
Bioengineering (Basel). 2024 Dec 20;11(12):1294. doi: 10.3390/bioengineering11121294.
The purpose of this study was to determine whether accounting for skinfold thickness would reduce the variability observed on a subject-by-subject basis for the -intercept and slope terms derived from the log-transformed EMG amplitude-power output relationship. We hypothesized that using skinfold thickness as a covariate would reduce the subject-by-subject variability in the -intercept and slope terms and, therefore, indicate potential mean differences between muscle groups.
Subjects had the skinfold from their three superficial quadriceps femoris muscles measured and then EMG electrodes placed over the three muscles. Thereafter, each subject performed an incremental single-leg knee-extensor ergometer exercise test to voluntary exhaustion.
The results indicated that using skinfold thickness as a covariate did not change the statistical outcome when comparing the mean values for the -intercept or slope terms across the three superficial quadriceps femoris muscles.
These findings suggest that there may be other factors that are influencing the subject-by-subject variability for the -intercept and slope terms, respectively.
本研究的目的是确定考虑皮褶厚度是否会减少从对数转换后的肌电图（EMG）振幅-功率输出关系得出的截距和斜率项在个体基础上观察到的变异性。我们假设将皮褶厚度用作协变量会减少截距和斜率项在个体间的变异性，从而表明肌肉群之间潜在的均值差异。
测量受试者股四头肌三块表浅肌肉的皮褶厚度，然后将肌电图电极置于这三块肌肉上。此后，每位受试者进行递增式单腿膝关节伸展测力计运动测试，直至自愿疲劳。
结果表明，在比较股四头肌三块表浅肌肉的截距或斜率项的均值时，将皮褶厚度用作协变量并不会改变统计结果。
这些发现表明，可能存在其他因素分别影响截距和斜率项在个体间的变异性。
