Distribution of innervation zone and muscle fiber conduction velocity in the biceps brachii muscle. J Electromyogr Kinesiol 2022 Apr;63:102637
Date
02/18/2022Pubmed ID
35176686Pubmed Central ID
PMC8960364DOI
10.1016/j.jelekin.2022.102637Scopus ID
2-s2.0-85124511396 (requires institutional sign-in at Scopus site) 1 CitationAbstract
The spatial distributions of muscle innervation zone (IZ) and muscle fiber conduction velocity (CV) were examined in nine healthy young male participants. High-density surface electromyography (EMG) was collected from the biceps brachii muscle when subjects performed isometric elbow flexions at 20% to 80% of the maximal voluntary contraction (MVC). A total of 9498 samples of IZs were identified and CVs were calculated using the Radon transform. The center and width of IZ sample distribution were compared within four different force levels and six medial to lateral electrode column positions using repeated measures ANOVA and multiple comparison tests. Significant shifts of IZ center were observed in the medial columns (Columns 5, 6, and 7) compared with the lateral columns (Columns 3 and 4) (p < 0.05). Similarly, significant differences in the IZ width were found in Column 7 and 8 compared to Column 3 (p < 0.05). In contrast, muscle CV was unaffected by column position. Instead, muscle CV was faster at 40% and 80% MVC compared to 20% MVC (p < 0.05). The findings of this study add further insights into the physiological properties of the biceps brachii muscle.
Author List
Li X, Huang C, Lu Z, Wang I, Klein CS, Zhang L, Zhou PAuthor
Xiaoyan Li PhD Assistant Professor in the Neurology department at Medical College of WisconsinMESH terms used to index this publication - Major topics in bold
ArmElectromyography
Humans
Isometric Contraction
Male
Muscle Contraction
Muscle Fibers, Skeletal
Muscle, Skeletal
