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

•EMG–EMG coherence of hand muscles is modulated as a function of wrist posture.•EMG–EMG coherence tends to be larger in extrinsic than intrinsic muscle pairs.•The present results suggest task-dependency of across-muscle coherence. The purpose of this study was to investigate the extent to which corr...

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Bibliographic Details
Published in:Neuroscience letters 2013-10, Vol.553, p.68-71
Main Authors: Jesunathadas, Mark, Laitano, Juan, Hamm, Thomas M., Santello, Marco
Format: Article
Language:English
Subjects:
Adult
Coordination
Electromyography
Female
Fingers
Force
Hand
Hand Strength
Humans
Male
Middle Aged
Muscle, Skeletal - physiology
Posture
Wrist - physiology
Young Adult
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Summary:•EMG–EMG coherence of hand muscles is modulated as a function of wrist posture.•EMG–EMG coherence tends to be larger in extrinsic than intrinsic muscle pairs.•The present results suggest task-dependency of across-muscle coherence. 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
ISSN:0304-3940
1872-7972
DOI:10.1016/j.neulet.2013.08.014