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[Effects of head-down bedrest on surface temperature distribution and non-evaporative heat dissipation]
Man Qiu1, Jian-min Wu, Ding-liang Gu
1Institute of Space Medico-Engineering, Beijing, China. qiuman@btamail.net.cn
Objective:
To study effect of simulated weightlessness on non-evaporative heat dissipation from different parts of the human body.
Method:
Body surface temperature distribution of five subjects was measured under -6 degrees head down bedrest for 7 d with HR-II infrared thermography. Non-evaporative heat dissipation was calculated with the heat exchange equations based on surface temperature.
Result:
The temperature difference between torso and extremities increased during bed rest, and the largest was 6.7 degrees C higher than the control on the 3rd day of bed rest. The part of non-evaporative heat dissipation from the torso increased about 6% and that from head-neck increased 2%. At the same time, the parts of heat dissipation from the upper and lower extremities decreased about 3% and 5% respectively.
Conclusion:
The parts of non-evaporative heat dissipation from different areas of the human body changed during simulated weightlessness. This result provided a basis for the flow distribution design of liquid cooling garment of EVA suit.