FDNS 2050 Lecture Notes - Lecture 15: Thermostat, Evaporation, Relative Humidity
7 Oct 2016
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Inadequate body compensation for heat loss or gain hypothermia (muscular incoordination and mental confusion) hyperthermia (weakness and fatigue and heat illnesses) How is body heat dissipated during exercise: exercise in a cool or cold environment. Sweat loss may be high if excess clothing is worn: exercise in a warm or hot environment evaporation of sweat is key factor. Total heat loss @ different ambient temperatures: 20% at 50 f, 45% at 68 f, 70% at 86 f. Maximal evaporation rate is about 30 ml/minute. Evaporation of 1 liter of sweat = 580 calories. Sweat that drips off does not remove heat. Running times about 1 minute for every 1 c beyond 8-15 c (each 1. 8 f beyond 46- Central neural fatigue caused by brain temperature. _ strain caused by changes in blood circulation. Muscle metabolism changes caused by increased _________ temperature.
