Document Detail

Effect of reaction time condition on EMG activities of the biceps brachii muscle in elbow flexion and forearm supination.
MedLine Citation:
PMID:  3226831     Owner:  NLM     Status:  MEDLINE    
Under simple- and choice-RT conditions, the biceps brachii muscle was examined in 8 healthy male subjects to determine how the temporal and spatial characteristics of elbow flexion and forearm supination differed at the initial phase of EMG activity and whether preparation or the presence of response uncertainty influenced the EMG outputs of the two movements. In the simple-RT condition, RT of supination was significantly faster than that of flexion but EMG activity of supination was less than that of flexion. In contrast, in the choice-RT condition, RT of flexion was significantly faster than that of supination but EMG activity of flexion was significantly reduced compared to supination. These findings indicate that advanced preparation or motor set facilitates the differentiation of RTs and EMG activities of the response movements and that response uncertainty causes a significant change in the temporal and spatial specificity of both elbow flexion and forearm supination.
J A Mojica; R Nakamura; Y Yamada; I Tsuji
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Perceptual and motor skills     Volume:  67     ISSN:  0031-5125     ISO Abbreviation:  Percept Mot Skills     Publication Date:  1988 Dec 
Date Detail:
Created Date:  1989-04-06     Completed Date:  1989-04-06     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0401131     Medline TA:  Percept Mot Skills     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  807-13     Citation Subset:  IM    
Institute of Rehabilitation Medicine, Tohoku University School of Medicine, Miyagi, Japan.
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MeSH Terms
Choice Behavior / physiology*
Elbow / physiology
Forearm / physiology
Middle Aged
Muscles / physiology*
Reaction Time / physiology*

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