Circadian variations of metabolism and body temperature in rats after capsaicin desensitization.
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概要
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Heat production (<I>M</I>), heat loss (<I>H</I>) and atrial temperature (T<SUB>at</SUB>) of capsaicin desensitized rats and of control rats were simultaneously measured over a period of 50 hours under a constantly dark <I>ad libitum</I> fed condition at 28°C. <I>M</I> and <I>H</I> were measured by direct and indirect calorimetry. In the capsaicin desensitized rats, the nocturnal T<SUB>at</SUB> was higher with more increased <I>M</I> than that in the controls. The maximum and minimum levels of nocturnal <I>M</I>and <I>H</I> were significantly higher in the capsaicin desensitized rats, but those of diurnal <I>M</I> and <I>H</I> were the same as those in the controls. These results suggest that capsaicin desensitization can influence on the level of thermoregulatory upper limit but not the lower limit in rats. The higher nocturnal body temperature in the capsaicin desensitized rats may be largely attributed to increased heat production associated with their enhanced physical activity at night.
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