Document Detail

Gastric myoelectrical activity increases after moderate-intensity exercise with no meals under suppressed vagal nerve activity.
MedLine Citation:
PMID:  15541200     Owner:  NLM     Status:  MEDLINE    
Postprandial gastric myoelectrical activity recorded by electrogastrogram (EGG) with the subject in a supine position has shown to be enhanced after moderate-intensity pedaling exercise in an upright seated position, despite the suppression of vagal nerve activity. However, it is still unknown whether the effect is due to the exercise itself and/or a meal or how the position change has influenced the effects. To address this, we used a position-controllable cycle ergometer to examine the effects of the moderate-intensity exercise on EGG activity and the high-frequency (HF) component of heart rate variability (HRV), an index of vagal nerve activity. To eliminate the effect of position change, we carried out the exercise and the EGG recording in the supine position. The peak amplitude of the EGG was enhanced by prior moderate-intensity exercise with a reduced HF component of HRV, which did not differ for postexercise conditions with or without a meal. The small amount of meal itself, however, enhanced both the peak amplitude of the EGG and the HF component of HRV. The peak frequency of EGG was reduced and the instability coefficient of EGG was increased only after the exercise itself. Taken together, these results suggest that the enhanced amplitude of gastric myoelectrical activity can be induced by moderate-intensity exercise itself, even with suppressed vagal nerve activity, and that the mechanism underlying the exercise effects would differ from that underlying the effect of a meal alone.
M Kato; T Sakai; K Yabe; M Miyamura; H Soya
Publication Detail:
Type:  Clinical Trial; Journal Article    
Journal Detail:
Title:  The Japanese journal of physiology     Volume:  54     ISSN:  0021-521X     ISO Abbreviation:  Jpn. J. Physiol.     Publication Date:  2004 Jun 
Date Detail:
Created Date:  2004-11-15     Completed Date:  2005-04-12     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  2985184R     Medline TA:  Jpn J Physiol     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  221-8     Citation Subset:  IM    
Laboratory of Exercise Biochemistry, University of Tsukuba Graduate School of Comprehensive Human Sciences, Tsukuba, Ibaraki, 305-8574 Japan.
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MeSH Terms
Electrocardiography / methods
Electromyography / methods
Exercise Test
Fasting / physiology*
Heart Rate / physiology*
Muscle Contraction / physiology
Muscle, Smooth / physiology*
Physical Exertion / physiology*
Postprandial Period / physiology*
Statistics as Topic
Stomach / physiology*
Vagus Nerve / physiology*

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