EFFECTS OF FITNESS, FATNESS, AND AGE ON MENS RESPONSES TO WHOLE-BODY COOLING IN AIR

被引:46
作者
BUDD, GM
BROTHERHOOD, JR
HENDRIE, AL
JEFFERY, SE
机构
[1] NIOHS, GPO Box 58, Sydney
关键词
INDIVIDUAL DIFFERENCES; CONFOUNDING; THERMOREGULATION; THERMAL COMFORT; THERMAL SENSATION; HEAT BALANCE; TISSUE INSULATION; VASOCONSTRICTION; SUBJECTIVE RESPONSES; BLOOD PRESSURE; HEART RATE;
D O I
10.1152/jappl.1991.71.6.2387
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
Simple and multiple regression analyses were used to assess the influence of 12 white men's fitness (aerobic capacity 44-58 ml O2 . min-1 . kg fat-free mass-1), fatness (mean skin-fold thickness 5-20 mm, body fat content 15-36%), and age (26-52 yr) on their thermal, metabolic, cardiovascular, and subjective responses to 2 h of whole body cooling, nude, in air at 10-degrees-C. Fitter men had slower heart rates, and fatter men had higher blood pressures. Fitness had no effect (P > 0.39) on any measured response to cold. Fatness was associated (P < 0.01) with reduced heat loss, heat production, and mean skin temperature; unchanged heat debt; and increased tissue insulation. Age had the opposite effects. When the confounding effects of fatness were held constant by multiple regression, older men responded to cold as though they were 1 mm of skinfold thickness leaner for each 3-4 yr of age. We conclude that aging, even between the relatively youthful ages of 26 and 52 yr, is accompanied by a progressive weakening of the vasoconstrictor response to cold.
引用
收藏
页码:2387 / 2393
页数:7
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