Across-muscle coherence is modulated as a function of wrist posture during two-digit grasping

NEUROSCIENCE LETTERS

卷:553

Article

Jesunathadas, Mark¹  Laitano, Juan¹  Hamm, Thomas M.²  Santello, Marco¹ 

[1] Arizona State Univ, Sch Biol & Hlth Syst Engn, Tempe, AZ 85287 USA

[2] St Josephs Hosp, Div Neurobiol, Barrow Neurol Inst, Phoenix, AZ USA

关键词: Hand;    Force;    Coordination;    Electromyography;   

DOI  :  10.1016/j.neulet.2013.08.014

来源: Elsevier

【 摘 要 】

The purpose of this study was to investigate the extent to which correlated neural inputs, quantified as EMG-EMG coherence across intrinsic and extrinsic hand muscles, varied as a function of wrist angle during a constant force precision grip task. Eight adults (5 males; mean age 29 years) participated in the experiment. Subjects held an object using a two-digit precision grip at a constant force at a flexed, neutral, and extended wrist posture, while the EMG activity from intrinsic and extrinsic hand muscles was recorded through intramuscular fine-wire electrodes. The integral of z-transformed coherence computed across muscles pairs was greatest in the flexed wrist posture and significantly greater than EMG-EMG coherence measured in the neutral and extended wrist posture (P < 0.01 and 0.05, respectively). Furthermore, EMG-EMG coherence did not differ statistically between the extrinsic and intrinsic muscle pairs, even though it tended to be greater for the extrinsic muscle pair (P >= 0.063). These findings lend support to the notion of a functional role of correlated neural inputs to hand muscles for the task-dependent coordination of hand muscle activity that is likely mediated by somatosensory feedback. (C) 2013 Elsevier Ireland Ltd. All rights reserved.

【 授权许可】

Free