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Effect of exercise training on the disappearance of cold adaptability in rats

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Summary

Following the transfer of cold-adapted rats to a warm environment at 25‡ C, enhanced nonshivering thermogenesis and enlarged interscapular brown adipose tissue (BAT) decreased gradually and reached a steady state after 4 weeks of de-adaptation. Animals that were exercised in the process of de-adaptation, however, showed no decrease in enhanced nonshivering thermogenesis, but did show a decrease in BAT weight as compared with sedentarily de-adapted animals. Triiodothyronine (T3), the physiologically most active thyroid hormone, was at a higher plasma level in cold-adapted rats than in de-adapted animals with or without exercise loads. Although the resting level of T3 in running-trained rats was not higher than that in sedentary rats, some fluctuations of T3 level were observed during running.

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Authors and Affiliations

  1. Laboratory of Health Education, Faculty of Education, Hokkaido University, North 11, West 7, Kita-ku, 060, Sapporo, Japan

    Kiyoshi Moriya

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  1. Kiyoshi Moriya
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Additional information

The part of this work using radioisotopes was performed in the Central Institute of Isotope Science, Hokkaido University

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Moriya, K. Effect of exercise training on the disappearance of cold adaptability in rats. Europ. J. Appl. Physiol. 55, 267–272 (1986). https://doi.org/10.1007/BF02343798

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  • DOI: https://doi.org/10.1007/BF02343798

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