Document Detail

Diurnal variations in vagal and sympathetic cardiac control.
MedLine Citation:
PMID:  2316678     Owner:  NLM     Status:  MEDLINE    
To investigate the diurnal variation in autonomic cardiac control, the magnitudes of the power spectral components of supine and standing heart rate variability were measured during controlled respiration (15 breaths/min). Examination was performed hourly between 0700 and 2300 h in eight male subjects whose activities and food intake were controlled for 24 h in the laboratory. The respiratory component (0.25 Hz) was greater in the morning than in the late afternoon (P less than 0.05) and decreased 30 min after food intake (P less than 0.01) in the supine position, but it was unaffected by the time of day or food intake while in the standing position. The Mayer wave component (0.03-0.15 Hz) did not change with the time of day, but it increased 90 min after food intake in both supine and standing positions (P less than 0.01 and P less than 0.05, respectively). These data suggest that supine vagal cardiac control during the waking period increases in the morning and decreases 30 min after food intake and that sympathetic cardiac control increases 90 min after food intake.
J Hayano; Y Sakakibara; M Yamada; T Kamiya; T Fujinami; K Yokoyama; Y Watanabe; K Takata
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The American journal of physiology     Volume:  258     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1990 Mar 
Date Detail:
Created Date:  1990-04-23     Completed Date:  1990-04-23     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  H642-6     Citation Subset:  IM    
Third Department of Internal Medicine, Nagoya City University Medical School, Aichi, Japan.
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MeSH Terms
Blood Pressure
Circadian Rhythm*
Eating / physiology
Heart Conduction System / physiology*
Heart Rate
Spectrum Analysis / methods
Sympathetic Nervous System / physiology*
Time Factors
Vagus Nerve / physiology*

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