title: [+Gz protection provided by tilt-back seat and GZ-2 anti-G suit].
abstract: OBJECTIVE
  To investigate the +Gz protection provided by tilt-back seat and GZ-2 anti-G suit.
  
  
  METHODS
  6 subjects were exposed to centrifuge and onset rate is 3 G/s. First, their relaxed +Gz tolerances were determined while using tilt-back seat of 13 degrees. Secondly, it was their +Gz tolerance provided by pressurized GZ-2 anti-G suit and tilt-back seat of 13 degrees. Finally, their +Gz tolerances while using pressurized GZ-2 anti-G suit and tilt-back seat of 45 degrees were determined. The difference between the first and the third result was the +Gz protection that pressurized GZ-2 anti-G suit and tilt-back seat of 45 degrees offered.
  
  
  RESULTS
  +Gz protection of pressurized GZ-2 anti-G suit and tilt-back seat of 13 degrees was 3.06 G, and +Gz protection of pressurized GZ-2 anti-G suit and tilt-back seat of 45 degrees was 4.13 G, which had an increase of 1.06 G.
  
  
  CONCLUSIONS
  Tilt-back seat of 45 degrees can greatly enhance +Gz tolerances of human.
authors.affiliation: Institute of Aviation Medicine, Air Force, Beijing 100036, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Xu
authors.forename: Xi-Chen
authors.initials: XC
authors.lastname: Geng
authors.forename: Hong
authors.initials: H
authors.lastname: Wang
authors.forename: Zhao
authors.initials: Z
authors.lastname: Jin
authors.forename: Gui-Ding
authors.initials: GD
authors.lastname: Yan
mesh_terms: D000293:Adolescent; D000337:Aerospace Medicine / Q000295:instrumentation* / Q000379:methods*; D002498:Centrifugation; D005676:Gravity Suits; D006801:Humans; D018471:Hypergravity; D008297:Male; D011187:Posture; D011481:Protective Clothing; D055815:Young Adult