Document Detail

Estrous-related variations of blood pressure and heart rate in female rats.
MedLine Citation:
PMID:  7993854     Owner:  NLM     Status:  MEDLINE    
In female rats, several biological variables change with a 4 or 5 day estrous cycle. To clarify whether blood pressure and heart rate show estrous-related changes, we measured three variables, i.e. mean arterial pressure (MAP), heart rate (HR) and spontaneous activity (ACT), using an implantable radiotelemetry transmitter and a computerized data collecting system non-invasively and chronically for more than 2 months. Under a 12-12 light-dark cycle, the three variables revealed clear daily variations and modulations by the estrous cycle which were most pronounced in the proestrous night. During the proestrous night, ACT showed a remarkable increase and a peak in the first half of the night, whereas MAP showed a gradual increase and a peak around midnight, and HR remained low without forming a peak. All modulations by the estrous cycle disappeared following bilateral ovariectomy. It is concluded that daily variations of blood pressure and heart rate are modulated according to the estrous cycle.
H Takezawa; H Hayashi; H Sano; S Ebihara
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Frontiers of medical and biological engineering : the international journal of the Japan Society of Medical Electronics and Biological Engineering     Volume:  6     ISSN:  0921-3775     ISO Abbreviation:  Front Med Biol Eng     Publication Date:  1994  
Date Detail:
Created Date:  1995-01-17     Completed Date:  1995-01-17     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  9011464     Medline TA:  Front Med Biol Eng     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  131-7     Citation Subset:  IM    
First Department of Internal Medicine, Nagoya University School of Medicine, Japan.
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MeSH Terms
Blood Pressure / physiology*
Circadian Rhythm / physiology
Estrus / physiology*
Heart Rate / physiology*
Monitoring, Physiologic
Rats, Wistar

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