title: [The protection effect of a new combined anti-G measure].
abstract: OBJECTIVE
  To observe the protection effect of a new combined anti-G measure which was composed of KH-x anti-G suit, unassisted PBG (positive pressure breathing for G, PBG) and PHP maneuver. The problem of fatigue and pain when using this measure was also discussed.
  
  
  METHODS
  Five fully qualified centrifuge subjects were exposed to 5 groups of +Gz exposure: (1) relaxed tolerance, (2) KH-x and KT-x, (3) PBG, (4) 6.5 G 45 s, (5) 9.0 G 15 s. The subjective feeling of fatigue and pain induced by +Gz exposure was evaluated by the questionnaire after runs.
  
  
  RESULTS
  There was no incidents of G-induced lose of consciousness in this study. The protective effect of KH-x and KT-x was 2.3 G while it was 1.7 G for PBG. All the subjects have accomplished the 4th and 5th runs. The pain has developed on neck, waist, arm and hands. The problem of waist pain was very significant.
  
  
  CONCLUSIONS
  The new combined anti-G measure could meet the requirement of +9.0 Gz protection for high performance plane. How to prevent the occurrence of neck injury and alleviate the pain induced by G when using this measure should be studied further.
authors.affiliation: Department of Aerospace Physiology, Fourth Military Medical University, Xian 710032, China.
authors.forename: Zhao
authors.initials: Z
authors.lastname: Jin
authors.forename: Xi-Chen
authors.initials: XC
authors.lastname: Geng
authors.forename: Li-Fan
authors.initials: LF
authors.lastname: Zhang
authors.forename: Li-Hui
authors.initials: LH
authors.lastname: Zhang
authors.forename: Li-Hua
authors.initials: LH
authors.lastname: Li
authors.forename: Bao-Hui
authors.initials: BH
authors.lastname: Li
authors.forename: Qian
authors.initials: Q
authors.lastname: Li
authors.forename: Hong
authors.initials: H
authors.lastname: Wang
authors.forename: Yi-Feng
authors.initials: YF
authors.lastname: Li
authors.forename: Gui-Ding
authors.initials: GD
authors.lastname: Yan
mesh_terms: D000054:Acceleration; D000328:Adult; D000337:Aerospace Medicine; D005221:Fatigue / Q000517:prevention & control; D005676:Gravity Suits; D006801:Humans; D008297:Male; D010146:Pain / Q000517:prevention & control; D019442:Space Suits; D055815:Young Adult