Pre-exercise cooling may help Thoroughbreds in hot training

Cooling horses before exercise may help Thoroughbreds handle short, intense work in hot conditions without sacrificing performance. In a new randomized crossover study from the Japan Racing Association’s Equine Research Institute, six trained Thoroughbreds completed three different pre-exercise routines in a hot environment with a wet-bulb globe temperature of about 32.5°C: 30 minutes of walking, 30 minutes of standing rest, or a 10-minute shower at about 26.2°C before warmup. The shower group lost less body weight and showed lower pulmonary artery temperatures than the walking group, while run time, heart rate, plasma lactate, and rectal temperature did not differ significantly across treatments. The authors concluded that pre-exercise cooling mitigated weight loss and body temperature elevation without affecting performance. (jstage.jst.go.jp)

Why it matters: For veterinary professionals working with equine athletes in hot climates, the findings add support to a practical heat-mitigation step before training or competition, especially where sweat loss, dehydration, and exertional heat illness are concerns. Broader literature and industry guidance already frame heat stress as a major welfare issue in horses, and emphasize that early detection plus effective cooling strategies are central to reducing risk in hot, humid environments. (link.springer.com)

What to watch: Expect more discussion around how pre-cooling protocols could be incorporated into training barns, racetrack management, and event heat-preparedness plans, particularly as hot-weather welfare guidance continues to evolve. (fei.org)