P-26 Differentiation of Impacts of Normobaric and Hypobaric Hypoxia on Cold Stress and Performance at a Low Temperature

Impacts of normobaric/hypobaric hypoxia on physiological and subjective responses were examined in resting eight healthy young males at 17℃. They were exposed to the atmospheric pressure at the sea-level maintained at 27℃ as base-line and then to the three experimental conditions of combination of b...

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Published in:Journal of PHYSIOLOGICAL ANTHROPOLOGY 2006, Vol.25 (2), p.209-210
Main Authors: Takako FUKAZAWA, Yuki TAKAHARA, Yutaka TOCHIHARA
Format: Article
Language:Japanese
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Summary:Impacts of normobaric/hypobaric hypoxia on physiological and subjective responses were examined in resting eight healthy young males at 17℃. They were exposed to the atmospheric pressure at the sea-level maintained at 27℃ as base-line and then to the three experimental conditions of combination of barometric (Pe) and partial oxygen (O2) pressures; normobaric hypoxia (NH, 760 mmHg Pe and 87 mmHg O2), hypobaric hypoxia (HH, 418 mmHg Pe and 87 mmHg O2), and normobaric normoxia (NN, 760 mmHg Pe and 159 mmHg O2). Decline in manual performance and coldness of HH were statistically smaller than those of NH, in spite of the same hypoxia level in both HH and NH. This is because of the decrease in core temperature during exposure to HH; in other words, the heat loss from the body was significantly smaller than that during exposure to NH due to the increased thermal resistance caused by the reduced atmospheric pressure.
ISSN:1880-6791