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Thermoregulation in the horse in response to exercise
D R Hodgson1, R E Davis, F F McConaghy
1Department of Animal Health University of Sydney, Camden, NSW, Australia.
The British Veterinary Journal
|May 1, 1994
Summary
Horses generate significant heat during exercise, with limited surface area for cooling. Understanding equine thermoregulation is crucial for preventing heat-related illnesses during exercise.
Area of Science:
- Equine physiology
- Exercise physiology
- Thermoregulation
Background:
- Exercise converts stored energy to mechanical energy inefficiently, producing heat.
- Horses have high metabolic capacity but limited surface area for heat dissipation, relying heavily on sweat evaporation.
- Evaporative cooling is compromised in high temperatures and humidity, increasing heat stress risk.
Purpose of the Study:
- To highlight the importance of understanding thermoregulatory responses in exercising horses.
- To emphasize the risks of heat-induced illnesses in equine athletes.
- To underscore the need for prompt recognition and management of heat stress.
Main Methods:
- The study reviews physiological mechanisms of heat production and dissipation during equine exercise.
- It analyzes the limitations of heat loss in horses, particularly under adverse environmental conditions.
- It discusses the impact of dehydration on thermoregulation.
Main Results:
- Approximately 80% of energy is lost as heat during exercise.
- Sweat evaporation accounts for at least two-thirds of heat dissipation, with losses exceeding 10 L/h.
- Respiratory heat loss can exceed 25% of the metabolic heat load during exercise.
Conclusions:
- Effective heat dissipation is critical for exercising horses due to their physiological constraints.
- High ambient temperature, humidity, and dehydration significantly increase the risk of heat-induced illness.
- Knowledge of equine thermoregulation is essential for preventing and managing exercise-related heat stress and illness.