[Effects of self-generated LBNP training on cardiovascular function and lower body negative pressure (LBNP) tolerance].
OBJECTIVE
To explore the changes of cardiac function and lower body negative pressure tolerance after self-generated Lower Body Negative Pressure device training and provide experimental evidences for its appliance.


METHODS
Twelve healthy male subjects were randomly divided into two groups, and received training on two conditions for entirely closing the valve or opening to -30 mmHg of peak LBNP separately. The group A was trained for five days and three minutes per day. Heartfunction, HUT and tolerance of LBNP were measured in pre-training, 3 d and post-training. The group B was trained for ten days and five minutes each day. All the measurements that was the same as in group A were made.


RESULTS
Heart function of group A decreased and tolerance of LBNP increased significantly (P<0.05). In group B, heart function increased significantly after 8 days training, so did tolerance of LBNP.


CONCLUSIONS
It suggested that lower body negative pressure tolerance could be improved by self-generated Lower Body Negative Pressure device training. The changes of cardiac function, however, were based on the project of training.
Yang
Chang-bin
CB
Department of Aerospace Biodynamics, The Fourth Military Medical University, Xi'an, China. cbyangboy@163.com
Sun
Xi-qing
XQ
Wang
Yong-chun
YC
Liu
Ting-song
TS
Feng
Dai-ya
DY
Yao
Yong-jie
YJ
D000222:Adaptation, Physiological / Q000502:physiology*; D000293:Adolescent; D000328:Adult; D001794:Blood Pressure / Q000502:physiology; D002302:Cardiac Output / Q000502:physiology; D002320:Cardiovascular Physiological Phenomena; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D008150:Lower Body Negative Pressure; D008297:Male; D011187:Posture / Q000502:physiology; D018667:Tilt-Table Test