That question took on sudden importance this week as Churchill Downs, for only the second time in its history, cancelled Wednesday’s race card because of expected excessive heat. Temperature, humidity and wind speed figured into the track’s decision. Lone Star Park in Texas, Belterra Racecourse in Ohio and Horseshoe Indianapolis in Indiana also cancelled their cards.

In Canada, it hasn’t been hot enough for cancellations – yet – but Hastings Racecourse in Vancouver, despite being located in a temperate climate zone, cancelled racing two days last year, June 28 and 29, when the humidex level reached 40. Woodbine cancelled on one day last year as well, Thursday, August 26. It felt like 42⁰C.

Heat Policies in Canada

There’s a wide range of opinion and policy in Canada, none of which meets the standard of Dr. David Marlin, a heat stress equestrian specialist in the U.K., where racetracks use his criteria for evaluating safe racing conditions for horses. Dr. Marlin earned his PhD from the UK’s leading sports university, Loughborough University, for his study on the responses of Thoroughbred racehorses to exercise and training. He’s advised on equine thermoregulation for many Olympic Games since 1996 and is the past Chair of the International Conference on Equine Exercise Physiology. He’s also authored over 200 scientific papers on exercise physiology, fitness training, thermoregulation, anhidrosis, and other related topics.

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