FIGURE 1.

Comparison of the exertional heat illness classification by mechanism (i.e., etiology-based classification; Casa et al., 2015) and by severity of clinical signs and symptoms (Japanese Association for Acute Medicine, 2015). Underlined signs and symptoms may serve as the diagnostic criteria for respective exertional heat illness when the context supports the development of exertional heat illness (i.e., moderate to high environmental condition, physical activity with high metabolic load).