Evaluation of washing with cold water to facilitate heat dissipation in horses exercised in hot, humid conditions.

The research study focuses on the effectiveness and potential effects of using cold water washing as a method to help horses cool down after exercise in hot, humid conditions. It concludes that applying cold water repeatedly is a safe and effective means to facilitate heat dissipation in horses.

Methods

• The study involved five physically fit Thoroughbred mares, ranging between three to ten years old.
• The horses were exercised on a high-speed treadmill in conditions with a temperature of approximately 31.1 degrees Celsius and relative humidity of 77.7%.
• The exercise session was terminated when the temperature of the pulmonary artery reached 41.5 degrees Celsius.
• A recovery period of 30 minutes was monitored after the exercise. During this time, temperatures of the pulmonary artery, rectum, and left gluteal muscle were compared while the horses either stood quietly (passive cooling) or were repeatedly exposed to cold water (active cooling).

Results

• Just four minutes into the recovery period, the pulmonary artery temperature recorded was significantly lower in actively cooled horses compared to passively cooled horses.
• The temperature of the left gluteal muscle decreased significantly in actively cooled horses during the recovery period, but not in passively cooled horses.
• By the end of 15 minutes in the recovery period, the heart rate and rectal temperature were significantly lower in active cooled horses than passively cooled horses.
• The cooling techniques didn’t have any impact on hydration status, muscle health, or serum electrolyte concentrations, and active cooling did not cause any observable adverse effects.

Conclusions

• The research concludes that active cooling via repeated applications of cold water is effective in facilitating heat dissipation in horses after they exercise in a hot, humid environment.
• Moreover, this technique proved to be safe, as no observable adverse effects were noted. It also seemed to have no negative impact on the horses’ hydration status, muscle health, or serum electrolyte concentrations.