Table 3. .
American College of Sports Medicine Wet Bulb Globe Temperature Index Scale7a
| Wet Bulb Globe Temperature, °F (°C) |
Nonacclimated |
Acclimated |
| <82.0 (27.8) | Increase work-to-rest ratio. Decrease total duration of activity. | Normal activity. Monitor fluid intake of participants. |
| 82.1–86.0 (27.9–30.0) | Increase work-to-rest ratio to 1:1. Limit intense exercise and watch at-risk athletes. | Plan intense or prolonged exercise with discretion. Watch at-risk individuals. |
| 86.1–90.0 (30.1–32.2) | Cancel or stop practice and competition. | Limit intense exercise and total exposure to heat and humidity. Watch for early signs and symptoms of exertional heat illness. |
| >90.0 (32.2) | Cancel exercise. | Cancel exercise. Uncompensable heat stress exists for athletes. |
a
Reprinted with permission from American College of Sports Medicine, Armstrong LE, Casa DJ, et al. American College of Sports Medicine position stand: exertional heat illness during training and competition. Med Sci Sports Exerc. 2007;39(3):556–572. Promotional and commercial use of the material in print, digital, or mobile device format is prohibited without the permission from the publisher Wolters Kluwer. Please contact healthpermissions@wolterskluwer for further information.