KNES 373 Lecture Notes - Lecture 30: Stroke Volume, Collegehumor, Glycogen
12 Apr 2019
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Knes 373 lecture 19 exercise in the heat. Increasing humidity can increase danger and risk, even if temperature is held constant: hot environments can be dangerous, but hot and humid are even worse. Acute responses to exercise in the heat (galloway & maughan 1997: can exercise for much less time at higher temperatures. Losing about half a liter of sweat in cold environments vs over a liter lost in the hot environment: heat = increased sweat rates. If the air is dry, we get more evaporation. If it is moist, it becomes more difficult for the evaporation to occur. If we don"t evaporate, we are not losing heat. Adaptations to exercise in the heat (nielsen et al. Increased: plasma volume, sweat onset and rate, stroke volume and co, blood pressure (better defended and not increased), drinking habit improved: decreased: temperature (body and skin), sweat composition, hr< glycogen utilization, blood lactate, electrolytes lost in sweat.
