Journal article
Equine plasma beta-endorphin concentrations are affected by exercise intensity and time of day
Equine veterinary journal. Supplement, (30), p.567
07/1999
Handle:
https://hdl.handle.net/2376/113726
PMID: 10659319
Abstract
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.
Metrics
7 Record Views
Details
- Title
- Equine plasma beta-endorphin concentrations are affected by exercise intensity and time of day
- Creators
- M L Mehl - Department of Veterinary Clinical Sciences, Washington State University, Pullman 99164, USAD K SarkarH C Schott, 2ndJ A BrownS N SampsonW M Bayly
- Publication Details
- Equine veterinary journal. Supplement, (30), p.567
- Academic Unit
- Veterinary Clinical Sciences, Department of
- Publisher
- United States
- Identifiers
- 99900547329601842
- Language
- English
- Resource Type
- Journal article