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Chinese Journal of Biomedical Engineering, 40(4), 438–445p. (2021) DOI:10.3969/j.issn.0258-8021.2021.04.07
The aim of this study is to explore the muscle coordination of forearm and hand for the grip and pinchcontrol. There were 24 right-handed healthy subjects participating in the experiment. Subjects were requested toproduce precisely 30%, 50% and 70% maximum voluntary contraction (MVC) of grip and pinch, duringwhich the surface electromyography (sEMG) signals were recorded from brachioradialis (BR), flexor carpiulnaris (FCU), flexor carpi radialis (FCR), extensor digitorum communis (EDC), flexor digitorumsuperficialis (FDS), abductor pollicis brevis (APB), first dorsal interosseous (FDI) and abductordigitiminimi (ADM). The recurrence networks (RNs) and multiplex recurrence networks (MRNs) based onmultivariate sEMG signals were constructed and then analyzed by the average shortest path length (L), theclustering coefficient (C) and the interlayer mutual information (I), the average edge overlap (-). Resultsshowed that the RNs of BR, FCU and FCR during grip performed significantly higher C values than that duringpinch under three force levels, take FCR as an example, grip vs pinch: 0. 393 ± 0. 040 vs 0. 366 ± 0. 035, 0. 404 ± 0. 040 vs 0. 372 ± 0. 035, 0. 412 ± 0. 051 vs 0. 383 ± 0. 040, P<0. 05; while for the RNs of FDI, grip vs pinch: 0. 443 ± 0. 035 vs 0. 462 ± 0. 046, 0. 446 ± 0. 032 vs 0. 461 ± 0. 035, 0. 445 ± 0. 040 vs0. 465 ± 0. 038, P<0. 05. However, the L values of BR, FCU and FCR of RNs during pinch were significantlyhigher than that during grip at three force levels, take FCU as an example, grip vs pinch: 2. 870 ± 0. 063 vs2. 941 ± 0. 124, 2. 841 ± 0. 065 vs 2. 941 ± 0. 079, 2. 830 ± 0. 083 vs 2. 901 ± 0. 051, P<0. 05. The I and - values of extrinsic MRNs under 50% and 70% MVC during grip were 4. 056 ± 0. 248 and 4. 099 ± 0. 232, 0. 253 ± 0. 015 and 0. 257 ± 0. 017, which were significantly higher than that during pinch (3. 930 ± 0. 229and 3. 939 ± 0. 195, 0. 245 ± 0. 011 and 0. 246 ± 0. 012, P<0. 05). In addition, the C of BR, FCU and FCRincreased, the L decreased, and the I and - of the extrinsic muscles MRNs increased with the grip forceaugmented. These results suggested different muscle coordination pattern between grip and pinch, and theintermuscular similarity and synchronization of extrinsic muscles would futher augmente with the increased forcelevel. These findings revealed the dynamical coordination across muscles with the force outputs and providednovel strategy for evaluating the neuromuscular function and making of the myoelectric prosthesis.
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