Experimental Physiology 2020 Halsey Are Humans Evolved Specialists For Running In The Heat Man Vs Horse Races(1)

Scientists have long theorized that humans evolved to be exceptionally good at long-distance running in hot weather, possibly as persistence hunters who could chase down faster prey by outlasting them in the heat. However, this idea had never been directly tested against other endurance animals until now.

Researchers analyzed race results from three annual "Man vs. Horse" competitions, where human athletes race directly against thoroughbred horses over the same course. By comparing how running speeds changed as temperatures increased, they discovered that while both humans and horses slow down in hotter weather, horses are affected much more dramatically. This provided the first direct evidence that human endurance running performance is indeed less impacted by high temperatures compared to other highly athletic mammals.

The findings support the evolutionary theory that humans developed specialized abilities for hot-weather endurance running. However, the researchers note that in absolute terms, horses (and most other animals) are still much faster than humans. They suggest that our ancestors' success at persistence hunting likely came from combining this small temperature advantage with our superior cognitive abilities - using strategy, experience, and mental discipline to eventually exhaust faster prey.

For metabolic health, this research highlights humans' unique physiological adaptations for sustained activity in challenging conditions. It reinforces the importance of endurance exercise as something our bodies are naturally designed for, and suggests that heat acclimatization and temperature management strategies could be valuable tools in optimizing athletic performance and overall metabolic function.