Document Detail

Diurnal variation of autonomic nervous activity in the rat: investigation by power spectral analysis of heart rate variability.
MedLine Citation:
PMID:  10338035     Owner:  NLM     Status:  MEDLINE    
We studied the diurnal variations of autonomic nervous function in rats. For this purpose, a long-term electrocardiogram (ECG) was recorded from conscious and unrestrained rats using a telemetry system, and the autonomic nervous function was investigated by the power spectral analysis of heart rate variability. No arrhythmias were observed in the ECG of any of the rats. Nocturnal patterns, in which the values of heart rate in the dark phase (2000-0600) were higher than those in the light phase (0600-2000), were observed. All normal rats shared a characteristic pattern in their power spectrum analysis. Both low-frequency and high-frequency power in the light phase were higher than those in the dark phase. However, these differences were not statistically significant (P > .05). The low frequency to high frequency ratio also showed a nocturnal pattern. The value in the dark phase was significantly higher (P < .05) than that in the light phase. These results suggest that the sympathetic nervous activity is predominant in the dark phase in rats. Therefore, we believe that this information may be useful for future biobehavioral studies.
M Hashimoto; M Kuwahara; H Tsubone; S Sugano
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of electrocardiology     Volume:  32     ISSN:  0022-0736     ISO Abbreviation:  J Electrocardiol     Publication Date:  1999 Apr 
Date Detail:
Created Date:  1999-07-08     Completed Date:  1999-07-08     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0153605     Medline TA:  J Electrocardiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  167-71     Citation Subset:  IM    
Department of Comparative Pathophysiology, Graduate School of Agriculture and Life Sciences, The University of Tokyo, Japan.
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MeSH Terms
Autonomic Nervous System / physiology*
Circadian Rhythm*
Data Interpretation, Statistical
Electrocardiography / instrumentation,  methods*
Heart / innervation*
Heart Rate / physiology*
Rats, Wistar

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