KER.Equinews.com - Full Article
By Kentucky Equine Research Staff · May 26, 2015
Exercise requires an integration of many systems, each containing varied elements, and any factor that upsets this integration could cause fatigue. Horse owners often have trouble identifying fatigue because its multidimensional nature varies with activity, training and physiological status of the individual, and environmental conditions.
The onset of fatigue is most often associated with either the accumulation of metabolic by-products or a decline in muscle glycogen concentration.
Key factors causing fatigue in humans parallel those factors causing fatigue in horses. In both human and horse endurance events, heat stress and substrate availability have been indicated as key factors in fatigue. In the horse, substantial depletion of muscle glycogen has been reported during endurance rides, supporting the idea that substrate availability may play a key role in fatigue...
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