TY - JOUR
T1 - Heat Acclimation
T2 - Cardiovascular Response to Hot/Dry and Hot/Wet Heat Loads in Rats
AU - Moran, D.
AU - Shapiro, Y.
AU - Laor, A.
AU - Meiri, U.
AU - Horowitz, M.
PY - 1996/3
Y1 - 1996/3
N2 - Body temperature, blood pressure (BP) and heart rate (HR) of rats before and after acclimation to heat were studied in chronically cannulated sedentary conscious rats in different hot environmental conditions [hot/dry: 40°C, 20% relative humidity (RH) and hot/wet: 35°C, 70% RH], During exposure to heat stress, acclimated rats showed an attenuated increase in colonic temperature (Tc) compared to non-acclimated rats. Concomitantly, an abrupt decrease in HR, delayed and attenuated elevation in mean arterial BP and improved cardiac efficiency were recorded. Differences were observed upon exposure to the hot/wet and hot/dry climates: the hot/dry climate imposed a greater physiological burden than the hot/wet climate. The data suggest that for sedentary rats dry heat produces a greater load than humid heat. Thus, the conventional heat load indices do not apply universally but have a thermoregulatory pattern specificity.
AB - Body temperature, blood pressure (BP) and heart rate (HR) of rats before and after acclimation to heat were studied in chronically cannulated sedentary conscious rats in different hot environmental conditions [hot/dry: 40°C, 20% relative humidity (RH) and hot/wet: 35°C, 70% RH], During exposure to heat stress, acclimated rats showed an attenuated increase in colonic temperature (Tc) compared to non-acclimated rats. Concomitantly, an abrupt decrease in HR, delayed and attenuated elevation in mean arterial BP and improved cardiac efficiency were recorded. Differences were observed upon exposure to the hot/wet and hot/dry climates: the hot/dry climate imposed a greater physiological burden than the hot/wet climate. The data suggest that for sedentary rats dry heat produces a greater load than humid heat. Thus, the conventional heat load indices do not apply universally but have a thermoregulatory pattern specificity.
KW - blood pressure
KW - cardiac work
KW - colonic temperature
KW - rat
UR - http://www.scopus.com/inward/record.url?scp=0030439039&partnerID=8YFLogxK
U2 - 10.1515/JBCPP.1996.7.4.375
DO - 10.1515/JBCPP.1996.7.4.375
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C2 - 9080311
AN - SCOPUS:0030439039
SN - 0792-6855
VL - 7
SP - 375
EP - 387
JO - Journal of Basic and Clinical Physiology and Pharmacology
JF - Journal of Basic and Clinical Physiology and Pharmacology
IS - 4
ER -