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[Variety of lower body negative pressure tolerance after different repeated lower body negative pressure exposures]
1Department of Aerospace Biodynamics, Fourth Military Medical University, Xi'an 710032, China.
Aim:
To investigate the variety of lower body negative pressure (LBNP) tolerance after different repeated lower body negative pressure exposures and select the best one.
Methods:
27 health male subjects were divided into 3 groups at random and exposed in 8 consecutive daily LBNP of -5.33 kPa 8 min (group A), -6.67 kPa 4 min (group B), - 6.67 kPa 8 min (group C) respectively. Pre- and post- exposures, lower body negative pressure tolerance were measured. HR and BP are recorded during exposures.
Results:
As compared with pre-exposure, Cumulative Stress Index (CSI) and During Negative Pressure(DNP) of group C are increased significantly after repeated LBNP exposures. During exposures HR increased and SBP decreased significantly. DBP did not change.
Conclusion:
LBNP tolerance were increased significantly after eight consecutive daily LBNP (- 6.67kPa) exposures. Among the three modes, this is the best one.
