[Effects of head-down bedrest on surface temperature distribution and non-evaporative heat dissipation].
OBJECTIVE
To study effect of simulated weightlessness on non-evaporative heat dissipation from different parts of the human body.


METHODS
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.


RESULTS
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.


CONCLUSIONS
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.
Qiu
Man
M
Institute of Space Medico-Engineering, Beijing, China. qiuman@btamail.net.cn
Wu
Jian-min
JM
Gu
Ding-liang
DL
Yu
Xue-jun
XJ
Yuan
Xiu-gan
XG
Chen
Jing-shan
JS
D001132:Arm; D001510:Bed Rest; D001833:Body Temperature Regulation / Q000502:physiology*; D018478:Extravehicular Activity; D006257:Head; D018475:Head-Down Tilt; D006358:Hot Temperature; D006801:Humans; D007866:Leg; D012881:Skin Temperature / Q000502:physiology*; D019442:Space Suits; D013817:Thermography; D013909:Thorax; D018474:Weightlessness Simulation