One study examined perceptual and physiological heat strain during exercise in both highly trained endurance and untrained individuals. The results of this study indicated that endurance trained individuals underestimated their perceptions in accordance with their heart rate and core temperature values. However, the untrained individuals perceived physiological strain in accordance with their heart rate and core temperature values. Though these findings may indicate that endurance trained athletes may be at risk, it could also indicate they may be able to tolerate a higher physiological strain. While numerous studies examining the effects of heat and humidity on RPE have been performed, little research has been performed on thermal sensation scales specifically designed for hot environments.