TY - JOUR
T1 - Does heat acclimation lower the rate of metabolism elicited by muscular exercise?
AU - Sawka, M. N.
AU - Pandolf, K. B.
AU - Avellini, B. A.
AU - Shapiro, Y.
PY - 1983
Y1 - 1983
N2 - Heat acclimation has been suggested to either lower or have no effect on the rate of metabolism (M) elicited by muscular exercises. The purpose of the present investigation (Study I) was to examine the effect heat acclimation has on the M (W x kg-1 or V̇O2 in ml x kg-1 x min-1) elicited by muscular exercise. Two additional investigations were evaluated to determine if season (summer or winter) of year (Study II) and subject gender (Study III) further influence the effect heat acclimation has on M during exercise. Volunteers for Study I (n = 15 men), II (n = 8 men), and III (n = 10 men and 9 women) completed standardized treadmill walks in hot (40°C, 30% rh or 49°C, 20% rh) and cool (20°C, 40% rh) environments immediately before and after heat acclimation. After heat acclimation, a lower M was observed for Study I (-4%; P < 0.05), II (-2%; N.S.) and III (-3%; p = 0.06) in the hot environments. In addition, after heat acclimation a lower M was observed for Study I (-3%; p = 0.08), II (-5%; p < 0.05) and III (-6%; p < 0.05) in the cool environment. Season of year and subject gender did not have a significant effect on these results. These data indicate that heat acclimation does lower the M elicited by exercise. The observed percent decrease was lower in the hot (-3%) than cool (-5%) test environments.
AB - Heat acclimation has been suggested to either lower or have no effect on the rate of metabolism (M) elicited by muscular exercises. The purpose of the present investigation (Study I) was to examine the effect heat acclimation has on the M (W x kg-1 or V̇O2 in ml x kg-1 x min-1) elicited by muscular exercise. Two additional investigations were evaluated to determine if season (summer or winter) of year (Study II) and subject gender (Study III) further influence the effect heat acclimation has on M during exercise. Volunteers for Study I (n = 15 men), II (n = 8 men), and III (n = 10 men and 9 women) completed standardized treadmill walks in hot (40°C, 30% rh or 49°C, 20% rh) and cool (20°C, 40% rh) environments immediately before and after heat acclimation. After heat acclimation, a lower M was observed for Study I (-4%; P < 0.05), II (-2%; N.S.) and III (-3%; p = 0.06) in the hot environments. In addition, after heat acclimation a lower M was observed for Study I (-3%; p = 0.08), II (-5%; p < 0.05) and III (-6%; p < 0.05) in the cool environment. Season of year and subject gender did not have a significant effect on these results. These data indicate that heat acclimation does lower the M elicited by exercise. The observed percent decrease was lower in the hot (-3%) than cool (-5%) test environments.
UR - http://www.scopus.com/inward/record.url?scp=0020659288&partnerID=8YFLogxK
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C2 - 6830554
AN - SCOPUS:0020659288
SN - 0095-6562
VL - 54
SP - 27
EP - 31
JO - Aviation Space and Environmental Medicine
JF - Aviation Space and Environmental Medicine
IS - 1
ER -