Hidenori Otani and his team in Japan have studied the affect that UV radiation has on athletic performance. Soccer players in particular cover less distance, and had higher heart rates despite despite lower physical output. Meaning UV exposure causes you to perform slower and work harder. ​​​​​​​​ ​​​​​​​​ To maximize performance make sure to use sunscreen.​​​​​​​​ ​​​​​​​​ ​​​​​​​​ Source: https://www.sportscienceagency.com/blog/2020/5/23/ssa-blog-wear-sunscreen