[Effects of simulated weightlessness on carbohydrate intake and serum lipids].
OBJECTIVE
To observe the effects of simulated weightlessness on the nutritional state and contents of serum lipids in human.


METHODS
Eighteen healthy men were exposed to 21 d bed rest with -6 degrees head down tilt (HDT -6 degrees). Nutrients intake was calculated and the lipids levels were determined on the first, eleventh and twenty-first day.


RESULTS
Intake of the three main nutrients, carbohydrates, protein and fat met the physiological requirement essentially, but carbohydrates intake was significantly reduced in the second week. There were no significant differences among the lipid levels during different periods.


CONCLUSIONS
Simulated weightlessness may exert a short-term and reversible influence on human nutritional intake except for lipids.
Hu
Y P
YP
The Air Force Lintong Sanatorium, Xi'an, China.
Wang
X Z
XZ
Liu
Z C
ZC
Ren
W H
WH
Wang
W Y
WY
Xu
J L
JL
D000293:Adolescent; D000328:Adult; D001510:Bed Rest; D004040:Dietary Carbohydrates / Q000097:blood / Q000378:metabolism*; D004041:Dietary Fats / Q000097:blood / Q000378:metabolism; D004044:Dietary Proteins / Q000097:blood / Q000378:metabolism; D018475:Head-Down Tilt; D006801:Humans; D050356:Lipid Metabolism; D008055:Lipids / Q000097:blood; D008297:Male; D009747:Nutritional Physiological Phenomena; D013997:Time Factors; D018474:Weightlessness Simulation
D004040:Dietary Carbohydrates; D004041:Dietary Fats; D004044:Dietary Proteins; D008055:Lipids