Protection Effects of a New Combined Anti-G Measure / 航天医学与医学工程

ABSTRACT

Objective To observe the protection effects of a new combined anti-G measure, which is composed of new bladder anti-G system, unassisted positive pressure breathing for G (PBG) and PHP maneuver. The problem of fatigue and pain when using this measure is also discussed. Method Each of the six fully qualified centrifuge subjects experienced 5 groups of centrifuge runs1) relaxed +Gz tolerance without anti-G equipments and PHP maneuver;2) +Gz tolerance with FLH-x+KT-x;3) +Gz tolerance when performing PBG with FLH-x, KT-x, YM-x and TK-x;4) +6.5 Gz for 45 s using the same anti-G equipments as the 3rd group;5) +9.0 Gz for 15 s using the same anti-G equipments as the 3rd group and performing PHP maneuver. Result There were no incidents of G-induced loss of consciousness in this study. The protective effects of FLH-x+KT-x, PBG and PHP maneuver were 2.5 G, 1.67 G and 1.23 G respectively. All the subjects had accomplished the 6.5 G 45 s and 9.0 G 15 s runs with the new combined anti-G measure. The pain occured on neck, waist, arm and hands. Conclusion The new combined anti-G measure can provide enough anti-G protection for modern high performance aircraft. How to prevent the occurrence of neck injury and alleviate the pain induced by G when using this measure needs further investigation.