Cold-induced Changes in Plasma Catecholamines in Men

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  • 寒冷曝露によるヒトの血漿カテコールアミンの変化

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In order to know a role of sympathetic function in men, 26 nude male subjects were exposed to 10°C or 5°C for 30 min and the changes in energy metabolism and plasma catecholamine levels were studied.<BR>Energy metabolism was elevated by 9.9±2.05 kcal/m2/h and 23.5±3.24 kcal/m2/h after 10°C and 5°C exposure, respectively. Plasma noradrenaline level was also significantly elevated in both ambient temperatures, but there is no difference between the increments in both temperature conditions: 451±141.1 pg/ml in 10°C and 321±72.4 pg/ml in 5°C. There is a positive correlation between the percent increases in plasma noradrenaline and those in energy metabolism after 10°C exposure but not after 5°C exposure.<BR>These results indicate that noradrenaline may be associated with cold-induced thermo-genesis in men.

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