| OCR Text |
Show 8 exercise and establish the need for rate convective heat loss its effect and sweat on into research more evaporation. Thermoregulatory Responses During Prolonged Exercise Total heat production increases from 20 to 25 of body during exercise the times above basal during high- level • intensity, prolonged, Heat generation is a exercise constant-rate direct function of the rate of catabolism, with minor variations in heat unit of oxygen uptake due to differences being utilized. substrate heat production is whereas heat 19.6 When production is .. per in the mixture of fat exclusively, liter of kilojoules 21.1 oxidizing glucose exclusively per fuel production oxidizing kilojoules 1974). (Rowell, oxygen liter when per Thermodynamic principles dictate that all of the heat produced will either go to power muscle about Because contraction, 20% to utilized within the (Whitt Wilson, & 25% be will be stored during remaining disipated at 75% accumulate. expenditure is endurance to 80% into the The waste heat internally. competitive cyclist riding or caloric muscles the intermuscular heat must be or total of working 1985), released, 70% of maximal cycling of environment generated by capacity is sufficient to raise internal temperature by 1 °c every 5 to 7 minutes stored, the life if none is dissipated. If all waste exercise would be limited to brief threatening effects of heat due to excess of periods hypertherIltia in were a |
