wet bulb globe temperature index

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An index developed by the US armed forces and used by athletes as an indicator of the relative severity of environmental temperatures. It is computed using the following equation: WBGT index = 0.7(WBT) + 0.2(GT) + 0.1(DBT), where WBT is the wet bulb temperature (recorded from a thermometer with the bulb surrounded by gauze, moistened with distilled water, and ventilated by a fan or a whirling device), GT is the temperature recorded from a thermometer enclosed in a black or grey metal sphere and exposed to the full intensity of sunlight encountered by the athlete, and DBT is the dry bulb temperature recorded on a normal thermometer not exposed to direct sunlight. The temperature is measured in degrees Fahrenheit. The index takes no account of the wind chill factor.

Subjects: Sports and Exercise Medicine.

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