title: [Variety of lower body negative pressure tolerance after different repeated lower body negative pressure exposures].
abstract: OBJECTIVE
  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.
  
  
  CONCLUSIONS
  LBNP tolerance were increased significantly after eight consecutive daily LBNP (- 6.67kPa) exposures. Among the three modes, this is the best one.
authors.affiliation: Department of Aerospace Biodynamics, Fourth Military Medical University, Xi'an 710032, China.
authors.forename: C B
authors.initials: CB
authors.lastname: Yang
authors.forename: Y J
authors.initials: YJ
authors.lastname: Yao
authors.forename: X Q
authors.initials: XQ
authors.lastname: Sun
authors.forename: X Y
authors.initials: XY
authors.lastname: Wu
mesh_terms: D000054:Acceleration; D000293:Adolescent; D000328:Adult; D006801:Humans; D008150:Lower Body Negative Pressure; D008297:Male; D010807:Physical Endurance / Q000502:physiology*; D011897:Random Allocation; D055815:Young Adult