Seasonal variation in basal metabolic rate and thermogenic response to cold

seasonal variation сезонные колебания cold thermogenesis термогенез cold tolerance oxygen intake потребление кислорода кислород vascularfunction rectal temperature ректальная температура air temperature температура воздуха холод

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Section PHYSIOLOGICAL ANTHROPOLOGY SEASONAL VARIATION IN BASAL METABOLIC RATE AND THERMOGENIC RESPONSE TO COLD Maeda Takafumi, Sakurai Hiroki, Takano Shoichi Laboratory of Environmental Ergonomics, Hokkaido University, Japan The purposes of this study were to clarify a seasonal variation in basal metabolic rate and thermogenic response to cold environment. <...> Twenty healthy men attended to this study, including cold exposure test, measurements of maximal oxygen intake, vascular function, basal metabolic rate, daily activity, and air temperature surrounding them in daily life, in winter and summer. <...> In cold exposure test, subjects were remained supine rest in the climatic chamber for 90 min, where air temperature was gradually declined from 26C to 5C in 90 min, with measuring rectal and skin temperatures, oxygen intake, skin blood fl ow, and blood pressure. <...> Basal metabolic rate in winter, compared with summer, increased in 13 subjects (increase BMR group) and decreased in others (decrease BMR group). <...> In the increase BMR group, oxygen intake, rectal and fi nger skin temperatures during cold exposure, and daily physical activity were signifi cantly higher in winter than summer. <...> In the decrease BMR group, there were no seasonal difference in oxygen intake, rectal temperature, and daily activity. <...> In winter, oxygen intake and rectal temperature during cold exposure, and daily physical activity were signifi cantly higher in the increase BMR group. <...> Furthermore, an onset of increment in oxygen intake during cold exposure was observed earlier in the increase BMR group than in the decrease BMR group in winter. <...> These results suggest that cold-induced thermogenesis is affected by seasonal variations in basal metabolic rate, and that a person with increase in basal metabolic rate from summer to winter has a calorigenic type of cold adaptation especially in winter, resulting in improved cold tolerance. <...> Key words: thermogenesis, cold tolerance, thermoregulation, seasonal variation, basal metabolic rate, oxygen intake Contact information: Maeda Takafumi, e-mail: maeda@eng.hokudai.ac.jp. 131 19 Конгресс Европейской Антропологической Ассоциации МГУ имени М. <...> Seasonal variation in basal metabolic rate and thermogenic response to cold! <...>

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