[A study on training method for increasing adaptability to blood redistribution in human].
OBJECTIVE
To verify validity of the increase in adaptability of blood redistribution in human body with repeated body position change training and to find preferable training method for increasing astronaut's adaptability of blood redistribution.


METHODS
Twelve subjects were randomly divided into group A and B. Six subjects in each group were trained with mode A and B repeated position change (9 times in 11 d) respectively. Their head-down tilt (HDT -30 degrees/30 min) tolerance and orthostatic tolerance were determined before and after training to verify training effects.


RESULTS
1) Two kinds of repeated body position change training modes increased all subjects' HDT tolerance. Compared with pre-training, during HDT test subjects' symptom scores in group B were significantly lower than those in group A (P<0.05) and after training decreasing magnitude of heart rate in group B increased significantly (P<0.01). Then mode B to be preferable training method in increasing HDT tolerance was suggested. 2) Two kinds of training modes improved all subjects' orthostatic tolerance. Compared with pre-training, during orthostatic tolerance test increasing magnitude of mean arterial blood pressure in group B increased significantly (P<0.05) and a trend of increasing magnitude of heart rate in group B was appeared smaller than in group A (P<0.10). Mode B to be preferable training method in increasing orthostatic tolerance was suggested too.


CONCLUSIONS
Repeated body position change training could increase adaptability to blood redistribution in human body. Mode B was preferable training method and would be hopeful to be used in astronaut training.
Institute of Space Medico-Engineering, Beijing, China.
Bin
B
Wu
Guang-xing
GX
You
Ping
P
Wu
Yue-ying
YY
Xue
Xing-hua
XH
Liu
Shuang-ning
SN
Su
D018480:Astronauts / Q000193:education*; D001676:Biofeedback, Psychology; D001794:Blood Pressure / Q000502:physiology; D018495:Fluid Shifts / Q000502:physiology*; D018475:Head-Down Tilt; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D007024:Hypotension, Orthostatic / Q000517:prevention & control*; D018474:Weightlessness Simulation