Nonshivering Thermoregulatory Responses in Trained Athletes : Effects of Physical Fitness and Body Fat

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Author(s)

Abstract

We studied the difference of thermoregulatory responses between trained male athletes (TR, n=9) and untrained men (UT, n=7) during 60 min of cold exposure (15°C) without shivering, and examined the effects of physical fitness and body fat on these responses. Mean skin temperature (¯T<SUB>sk</SUB>), esophageal temperature (T<SUB>es</SUB>), and skin conductance (K<SUB>b</SUB>) were similar between TR and UT, and heat production (¯M) for TR increased significantly during exposure at 15°C. The ¯M at 15°C correlated positively with maximal oxygen uptake and negatively with body fat (%BF), but not with T<SUB>es</SUB>. The K<SUB>b</SUB> correlated negatively with T<SUB>es</SUB> and positively with ¯T<SUB>sk</SUB>. The %BF also correlated negatively with K<SUB>b</SUB> and ¯T<SUB>sk</SUB> during exposure at 15°C, and the slope of %BF vs. ¯T<SUB>sk</SUB> relationship was significantly steeper in TR than in UT. These results suggest that (1) body temperature is maintained by the reduction of skin conductance, and (2) heat insulation independent of body fat is enhanced in trained athletes during cold exposure without shivering.

Journal

  • The Japanese Journal of Physiology

    The Japanese Journal of Physiology 48(2), 143-148, 1998-04

    THE PHYSIOLOGICAL SOCIETY OF JAPAN

References:  18

Cited by:  6

Codes

  • NII Article ID (NAID)
    10008304365
  • NII NACSIS-CAT ID (NCID)
    AA00691224
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    0021521X
  • NDL Article ID
    4514081
  • NDL Source Classification
    ZS8(科学技術--医学--解剖学・生理学・生化学)
  • NDL Call No.
    Z53-D40
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
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