A simple measurement of environmental heat stress recorded by spinning an ordinary thermometer with a damp wick around the bulb. The temperature recorded is usually less than that for a dry bulb thermometer because of heat lost by evaporation. High wet bulb temperatures usually indicate high humidity when there is a greater danger of heat stress. Athletes wearing protective clothing may be at risk of overheating when the WBT exceeds 60°F.
Subjects: Sports and Exercise Medicine.