Cutaneous Vasodilation Response to a Linear Increase in Air Temperature from 28℃ to 40℃ in Prepubertal Boys and Young Men

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概要

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• The cutaneous vasodilation and sweating responses of prepubertal children to heat stress were examined. Seven prepubertal boys (9-11 years old) and 9 young men (20-24 years old) were seated wearing only swimming trunks while the air temperature (T_a) was linearly increased from 28℃ to 40℃ over 50min and then maintained at 40℃ for an additional 10min. Skin temperature, cutaneous vascular conductance (CVC), and local sweating rate (m^^・_<sw>) were measured at multiple sites on the body. The boys had a significantly greater mean surface area-to-mass ratio compared with the young men. The rectal temperature did not change in either group with increasing T_a, although it was significantly higher in the boys. During the first half of the exposure period, when T_a was less than the mean skin temperature (T^-_<sk>), the boys had significantly higher CVC on the chest and significantly lower m_<sw> on the chest and thigh as compared with the young men. During the latter half of the exposure, when heat stress was increased as T_a exceeded T^-_<sk>, the boys had significantly higher T^-_<sk>, greater CVC on the chest and finger, greater rate of increase in the CVC on the forehead and finger, lower m_<sw> on the chest and thigh, greater increase in heart rate, and higher thermal sensation. The mean body temperature at the onset of sweating was significantly greater in the boys than in the men. These results suggest that, compared with young men, prepubertal boys manifest greater physiological and perceptual strain under heat stress induced by T_a exceeding T^-_<sk>, which is most probably attributable to a combination of lower evaporative heat loss, as evidenced by lower m^^・_<sw>, and greater heat gain owing to a larger surface area-to-mass ratio. The maturation-related differences in heat loss responses vary according to body site.

著者

• 近藤 徳彦

  神戸大学 発達科学部

• Ueda Hiroyuki

  Osaka Shin-ai College

• KONDO Narihiko

  Laboratory for Applied Human Physiology, Faculty of Human Development, Kobe University

• Kondo Narihiko

  Laboratory For Applied Human Physiology Faculty Of Human Development Kobe University

• Kondo N

  Kobe Univ. Kobe Jpn

• Kondo Narihiko

  Kobe University

• Kondo Narihiko

  Faculty Of Human Development Kobe University.

• Kondo Narihiko

  Graduate School Of Human Development And Environment Kobe University

• Kondo Narihiko

  Laboratory For Exercise And Environmental Physiology Faculty Of Human Development Kobe University

• KICHINOSE Tomoko

  JSPS Research Fellow (Osaka International University)

• Ichinose-kuwahara Tomoko

  Laboratory For Human Performance Research Osaka International University

• ARAKI Tsutomu

  Hyogo University of Teacher Education

• Inoue Yoshimitsu

  Laboratory for Human Performance Research, Osaka International University

• Nakamura Syunichi

  Hyogo University of Teacher Education

• Yasumatsu Hideshi

  Higashiosaka Junior College

• Inoue Yoshimitsu

  Laboratory For Human Performance Research Osaka International University

• Ueda Hiroyuki

  Osaka Shin-ai Coilege

• 近藤 徳彦

  神戸大学

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