Document Detail

Influence of time of day on body temperature, heart rate, arterial pressure, and other biological variables in horses during incremental exercise.
MedLine Citation:
PMID:  19142757     Owner:  NLM     Status:  MEDLINE    
We examined the response to exercise of selected physiological variables in horses performing the identical routine for eight days, in the morning (a.m.) or in the afternoon (p.m.). Heart rate (HR), systolic and diastolic blood pressure (BP), and body temperature (BT) were all consistently greater in the p.m. For BP and BT, the absolute increase above the a.m. values was the same at rest and during exercise. For HR, the absolute increase was greater during exercise, but the percent increase was the same as during rest. During exercise, blood glucose decreased, while blood lactate and skin temperature increased; these changes were the same during the a.m. and p.m. sessions. We conclude that there is no indication in horses of a difference in the responses of HR, BP, and BT to exercise between the a.m. and p.m. The circadian oscillations, however, alter the absolute values of these variables both at rest and during exercise, raising the possibility that the safety margins against hyperthermia and hypertension may decrease during p.m. exercise.
Giuseppe Piccione; Claudia Giannetto; Anna Assenza; Stefania Casella; Giovanni Caola
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Chronobiology international     Volume:  26     ISSN:  1525-6073     ISO Abbreviation:  Chronobiol. Int.     Publication Date:  2009 Jan 
Date Detail:
Created Date:  2009-01-14     Completed Date:  2009-03-10     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8501362     Medline TA:  Chronobiol Int     Country:  United States    
Other Details:
Languages:  eng     Pagination:  47-60     Citation Subset:  IM    
Department of Experimental Science and Applied Biotechnology, Laboratory of Veterinary Chronophysiology, Faculty of Veterinary Medicine, University of Messina, Messina, Italy.
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MeSH Terms
Blood Pressure / physiology*
Body Temperature / physiology*
Circadian Rhythm / physiology*
Heart Rate / physiology*
Horses / physiology*
Physical Conditioning, Animal / physiology*
Time Factors

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