HP动作对模拟推拉效应的防护作用  

Protective effect of HP maneuver on push-pull effect

作　　者：徐艳[1] 耿喜臣[1] 金朝[1] 王红[1] 李立华[1] 李茜[1] 李毅峰 李宝辉[1] 颜桂定[1] 陆霞[1] 

机构地区：[1]空军航空医学研究所,北京100036

出　　处：《中华航空航天医学杂志》2003年第3期136-139,共4页Chinese Journal of Aerospace Medicine

摘　　要：目的　利用下体正压在单轴向离心机上模拟推拉动作 ,观察提前做HP动作对推拉效应的防护效果。　方法　志愿者 10名 ,分为L 1动作试验组和HP动作试验组。先测定两组受试者的基础耐力 ;然后受试者穿抗荷服 (L 1动作组穿KH 3、HP动作组穿KH 7) )充气 4 0kPa(30 0mmHg) 持续 1min ,卸压后立即启动离心机 ,测定两组受试者下体正压卸压后的松弛耐力 ;再分别测定L 1动作组和HP动作组下体正压结束后立即做抗荷动作的 +Gz 耐力。　结果　下体正压卸压后HP动作组 +Gz 耐力下降 0 .70G (P <0 .0 1) ,L 1动作组耐力下降无显著性意义 (P >0 .0 5 )。下体正压卸压后采用抗荷收紧动作可使受试者的 +Gz 耐力显著升高 ,HP动作组提高程度为 3.4 0G(P <0 .0 1) ,L 1动作组为 2 .6 0G (P <0 .0 1)。下体正压卸压后采用L 1动作的耐力的增高程度比采用HP动作低 0 .8G (P <0 .0 5 ) ,采用HP动作最多可以使受试者 +Gz 耐力增加 3.75G ,且主诉疲劳程度低。Objective To explore the protective effect of performing HP maneuver in advance against simulated push pull effect (PPE) on a single axis human centrifuge. Methods Ten volunteers served as subjects. They were divided into two groups: HP maneuver group and L 1 maneuver group. The experiment was carried out as follows: ①The baseline +G z tolerances of both group were measured; ②The PPE were simulated by inflating anti G suit (L 1 group wearing KH 3 and HP group KH 7) up to 40 kPa for 1 min and then subjected to centrifuge run immediately after deflation; ③Subjects' relaxed +G z tolerances and tolerances performing HP or L 1 maneuver immediately after PPE simulation were measured in separated experiments. Results The relaxed +G z tolerance after simulated PPE in HP maneuver group was significantly less(0.70 G, P< 0.01) than baseline value while the difference between relaxed tolerance after PPE and baseline value in L 1 maneuver group was nonsignificant ( P> 0.05). When anti G straining maneuvers (AGSM) were implemented immediately after deflation, +G z tolerances of HP maneuver and L 1 maneuver group were elevated by 3.40 G ( P< 0.01) and 2.60 G ( P< 0.01) respectively. The augment in HP maneuver group (up to 3.75 G) was 0.8 G ( P< 0.05) higher than that of L 1 maneuver group, and much less fatigue was reported. Conclusion It is suggested that performing HP maneuver during the transition from -G z to +G z can attenuate the push pull effect.

关 键 词：加速度 抗荷动作 推拉效应 下体正压 

分 类 号：R85[医药卫生—航空、航天与航海医学]