Eur J Appl Physiol (1992) 65:492-498 European Journal of

Applied

Physiology and Occupational Physiology © Springer-Verlag1992

Thermoregulatory responses of young and older men to cold exposure Yoshimitsu Inoue 1, Mikio Nakao 2, Tsutomu Araki 3, and Hiroyuki Ueda 4 1 Department of Hygiene, Kobe University School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe 650, Japan 2 Osaka University of Economics, Osaka 533, Japan 3 Hyogo University of Teacher Education, Kato-gun 673-14, Japan 4 Osaka Shin-ai College, Osaka 536, Japan Accepted July 13, 1992

Summary. Nine young (20-25 years) and ten older (6071 years) men, matched for body fatness and surface area:mass ratio, underwent cold tests in summer and winter. The cold tests consisted of a 60-min exposure, wearing only swimming trunks, to an air temperature of 17° C (both seasons) and 12° C (winter only). Rectal (Tre) and mean skin (~k) temperatures, metabolic heat production (M), systolic (BP~) and diastolic (BPd) blood pressures and heart rate (fc) were measured. During the equilibrium period (28°C air tem_perature) there were no age-related differences in Tre, Tsk, BPs, BPd, or fc regardless of season, although M of the older men was significantly lower ( P < 0.003). The decrease in Tre and Tsk (due to the marked decrease in six of the older men) and the increase in BPs and BPd were significantly greater (P

Thermoregulatory responses of young and older men to cold exposure.

Nine young (20-25 years) and ten older (60-71 years) men, matched for body fatness and surface area:mass ratio, underwent cold tests in summer and win...
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