Document Detail

Information processing during physical exercise: a chronometric and electromyographic study.
MedLine Citation:
PMID:  15883799     Owner:  NLM     Status:  MEDLINE    
Choice reaction time (RT) is shorter when participants perform a choice task at the same time as a sub-maximal exercise than when they are at rest. The purpose of the present study was to determine whether such an exercise affects response execution or whether it alters processes located upstream from the neuro-muscular level. To this end, the electromyographic (EMG) activity of the response agonists was analysed in a between-hand choice RT task performed either concurrently with a pedalling task or at rest. Visual stimulus intensity was also manipulated so as to determine whether exercise further affects early sensory processes. Results shows that exercise affected the time interval elapsing from the onset of the contraction of the response agonists to the mechanical response, thereby indicating that this variable modifies the peripheral motor processes involved in response execution. EMG signal analyses further revealed that the cortico-spinal command is more efficient during exercise than at rest. In addition, exercise was shown to interact with visual stimulus intensity on the time between stimulus and voluntary EMG onset and to increase the critical flicker fusion frequency threshold, thereby indicating that exercise modifies the peripheral sensory processes involved in early sensory operations. The decomposition of RT, with respect to the EMG activity of response agonists, sheds light on the processes affected by exercise and suggests that exercise affects both sensory processes and late motor processes.
Karen Davranche; Borís Burle; Michel Audiffren; Thierry Hasbroucq
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Publication Detail:
Type:  Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-05-10
Journal Detail:
Title:  Experimental brain research     Volume:  165     ISSN:  0014-4819     ISO Abbreviation:  Exp Brain Res     Publication Date:  2005 Sep 
Date Detail:
Created Date:  2005-09-05     Completed Date:  2005-12-01     Revised Date:  2013-12-13    
Medline Journal Info:
Nlm Unique ID:  0043312     Medline TA:  Exp Brain Res     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  532-40     Citation Subset:  IM    
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MeSH Terms
Arousal / physiology
Cerebral Cortex / physiology
Data Interpretation, Statistical
Exercise / physiology*
Flicker Fusion / physiology
Mental Processes / physiology*
Photic Stimulation
Psychomotor Performance / physiology
Reaction Time / physiology
Retinal Ganglion Cells / physiology
Signal Processing, Computer-Assisted
Visual Perception / physiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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