EHS 360 Lecture Notes - Lecture 25: Heat Cramps, Exercise Prescription, Acclimatization
4 Dec 2017
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Body"s cooling process vessels dilate and blood flow closer to skin surface. Process continues core heat and large muscle heat transferred to skin surface. Dehydration can tolerate 3-5% body weight w/o loss of strength can"t tolerate 6% or more - strength decreases. 1 pint of fluid per each pound of body weight. Heat cramps syncope fainting, decreased hr heat exhaustion. Decreased bp, increased hr to shock symptoms. Elderly lack of acclimatization current illness and some medications. Use target heart rate instead of % of intensity. Monitor environment, activity, clothes short sessions rested, hydrated, nourished and acclimatized. Wet skin cools faster when exposed to wind layer clothing insulation created by trapping air b/w layers inner, middle, outer. People w/ cardiac conditions at greater risk snow shoveling. Walking in deep snow swimming in cold water. Atmospheric pressure drops - results in reduced arterial oxygen levels. Body compensates by increasing ventilation and cardiac output hr)
