Two synergistic types of muscles were detected during forearm rotation exercise by T 2 cumulative frequency curves using 0.2 T magnetic resonance imaging

The purpose of this study was the detection and characterization of synergistic muscle activity. Using T -map MRI, T values for 10 forearm muscles in 11 healthy adult volunteers were obtained in the resting state and after isotonic forearm supination and pronation exercises with the elbow extended....

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Bibliographic Details
Published in:The journal of physiological sciences 2024-04, Vol.74 (1), p.25
Main Authors: Takamori, Masayoshi, Akiyama, Sumikazu, Seo, Yoshiteru, Mizushima, Takashi
Format: Article
Language:English
Subjects:
Adult
Elbow - physiology
Forearm
Humans
Magnetic Resonance Imaging
Muscle Contraction - physiology
Muscle, Skeletal - diagnostic imaging
Muscle, Skeletal - physiology
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Summary:The purpose of this study was the detection and characterization of synergistic muscle activity. Using T -map MRI, T values for 10 forearm muscles in 11 healthy adult volunteers were obtained in the resting state and after isotonic forearm supination and pronation exercises with the elbow extended. T was normalized by Z = (T -T )/SD , where T was T after exercise, while T and SD were the reference values of 34 ms and 3 ms, respectively. Using the cumulative frequency curves of Z values (CFZ), we detected 2 and 3 synergistic muscles for supination and pronation, respectively, and divided these into 2 types, one activated by exercise strength dependently, and the other, independent of exercise strength, activated by only a smaller fraction of the participants. We also detected co-contraction for the supination. Thus, CFZ is a useful visualization tool to detect and characterize not only synergistic muscle, but also co-contraction muscle.
ISSN:1880-6562
DOI:10.1186/s12576-024-00920-9