腿部加压套带对推拉效应的防护作用

Protection of Pressurized Leg Belts on Push-pull Effect

目的观察志愿者暴露于-1.5 Gz持续5 s与+Gz持续10 s离心机加速度作用下,腿部加压套带(压力20 k Pa)对推拉效应(PPE)的防护效果。方法分别测定5名志愿者预先无-1.5 Gz作用时的基础+Gz耐力,预先有-1.5 Gz作用时的基础+Gz耐力及分别采用HP动作、腿部加压套带、腿部加压套带并做HP动作时的+Gz耐力。结果预先-1.5 Gz作用使基础+Gz耐力下降(1.55±0.11)G(P<0.01),HP动作、腿部加压套带及二者结合使用时分别增加+Gz耐力(1.25±0.25)G、(1.25±0.25)G、(2.40±0.29)G(P<0.01);分别采用HP动作、腿部加压套带及二者结合使用时耐力终点+Gz暴露时的HR均显著高于其前-1.5 Gz暴露时。结论证实了腿部加压套带对PPE的防护效果,对PPE防护装备的研制具有重要的意义。

Objective To examine the through centrifuge exposures to -1.5 protection of pressurized leg belts （20 kPa） on push-pull effect （PPE） Gz for 5 s combined with ＋ Gz for 10s. Methods ＋ Gz tolerance of five subjects were measured under the following 5 conditions： relaxed pure ＋ Gz tolerance, ＋ Gz tolerance with prior -1.5 Gz exposure when subjects were relaxed, performing HP maneuver, using pressurized leg belts, and combination of HP maneuver and pressurized leg belts. Results Relaxed ＋ Gz tolerance was reduced by （ 1.55 ± 0.11 ） G （ P 〈 0.01 ） after - 1.5 Gz exposure for 5 s. Protections by HP maneuver, pressurized leg belts, and combination of HP maneuver with pressurized leg belts were （ 1.25 ± 0.25） G, （ 1.25 ± 0.25 ） G, and （2.40±0.29）G（P 〈 O. O1 ）, respectively. When protected by HP maneuver, pressurized leg belts or their combination, the heart rate during ＋ Gz exposures at endpoints was significantly faster than that during its previous - 1.5 Gz exposure. Conclusion It is confirmed that the pressurized leg belts can provide effective protection for PPE, which is of great significance for developing PPE protection equipment.