Document Detail

Equine plasma beta-endorphin concentrations are affected by exercise intensity and time of day.
MedLine Citation:
PMID:  10659319     Owner:  NLM     Status:  MEDLINE    
Eight mature mares were exercised for 20 min at 60% VO2max and to fatigue at 95% VO2max. Plasma beta-endorphin (EN) concentrations were determined before exercise, after a 10 min warm-up, and at the end of each exercise test. Mean +/- s.e. beta-endorphin concentrations were significantly (P < 0.05) higher following work at 95% VO2max when compared to that at 60% VO2max (420.0 +/- 102.7 vs. 269.9 +/- 30.69 pg/ml). Pre-exercise samples were collected between 1000 and 1500 h. In order to evaluate whether any cyclic changes in EN secretion effects may have influenced results, a subsequent study was completed using 12 horses to assess diurnal fluctuations in EN concentrations, by measuring EN concentration every 2 h for a 24 h period. There was no statistical difference in mean values at any time between 0800 and 2000 h. Whether individual differences in EN concentrations reflected varying degrees of stress associated with the exercise could not be determined. Any possible link between EN concentration and exercise stress in exercising horses awaits clarification.
M L Mehl; D K Sarkar; H C Schott; J A Brown; S N Sampson; W M Bayly
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Equine veterinary journal. Supplement     Volume:  -     ISSN:  -     ISO Abbreviation:  Equine Vet J Suppl     Publication Date:  1999 Jul 
Date Detail:
Created Date:  2000-03-02     Completed Date:  2000-03-02     Revised Date:  2013-05-16    
Medline Journal Info:
Nlm Unique ID:  9614088     Medline TA:  Equine Vet J Suppl     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  567-9     Citation Subset:  IM    
Department of Veterinary Clinical Sciences, Washington State University, Pullman 99164, USA.
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MeSH Terms
Circadian Rhythm*
Horses / blood*
Muscle Fatigue
Oxygen Consumption
Physical Conditioning, Animal*
beta-Endorphin / blood*
Reg. No./Substance:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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