2024 Yes https://doi.org/10.1007/s00484-024-02812-4 Oyama, Takahiro Asia Observational Epidemiology Study Modeling Students Middle/Jr High (6-8) High School (9-12) Temperature Other Heat-related illness Sports club activities Wet-bulb temperature Case-crossover study Heat safety thresholds Using a case-crossover design and national WBGT data, this study found rising heat illness risk among Japanese student athletes. Results support lowering heat safety thresholds by 3°C for high-risk sports and early practices to better protect student health.