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目的 用单轴向离心机和下体正压模拟推拉动作 ,研究后倾座椅对推拉效应的影响。 方法 6名受试者在离心机上直座椅测基础耐力后 ,着 KH- 3抗荷服充气 30 0 m m Hg(1mm Hg=0 .133k Pa) 1m in,放气后立即转动离心机 ,测松弛 G耐力。然后将座椅后倾 45°重复。 结果 下体正压后 G耐力显著下降 (P<0 .0 1) ,采用后倾座椅后显著升高 (与对照相比 ,P<0 .0 1;与下体正压后相比 ,P<0 .0 5 )。后倾座椅在有和无预先下体正压的耐力之间有显著差别 ,预先有下体正压比无下体正压时显著低 (P<0 .0 1)。后倾座椅在预先有与无下体正压时提高的 G耐力分别为 0 .91± 0 .6 1和 1.17± 0 .30 ,差别无显著性意义 (P>0 .0 5 )。 结论 后倾座椅可以使推拉效应降低的 G耐力提高 ,但不能完全消除推拉效应。
Objective To simulate the effect of push-pull effect by using the uniaxial centrifuge and the lower body positive pressure to simulate the push and pull motion. Methods Six subjects were tested for endurance in a straight seat on a centrifuge and then infiltrated by a KH- 3 anti-Dutch clothing for 30 mm Hg (1 mm Hg = 0.133 k Pa) for 1 m in. The centrifuge was rotated immediately after deflation Relax G endurance. Then tilt the seat 45 ° repeat. Results Compared with the control group, the G-endurance of the lower body was significantly decreased (P <0.01), and the posterior chamber of the lower body was significantly increased (P <0.01; P < 0 .0 5). There was a significant difference between the posterior seat and the endurance without pre-inferior body pressure, with pre-existing lower body positive pressure significantly lower than without the lower body positive pressure (P <0.01). There was no significant difference (P> 0.05) in the G-endurance of the recliner seat with and without lower body pressure increasing at 0 .91 ± 0.61 and 1.17 ± 0.30, respectively. Conclusions The recline seat can improve G endurance with reduced push-pull effect, but can not completely eliminate the push-pull effect.