摘要
目的 用单轴向离心机和下体正压模拟推拉动作 ,研究推拉动作对 + GZ耐力的影响。 方法 6名受试者着 KH- 3抗荷服充气 30 0 mm Hg(1mm Hg=0 .133k Pa) 1min,测定下体正压前、中、后血压 (BP)、心率 (HR)变化。在离心机上测基础耐力后 ,向抗荷服充气 30 0 mm Hg,1m in放气后立即转动离心机 ,测松弛 G耐力。 结果 收缩压 (SBP)在下体正压中与下体正压前相比升高有显著性意义 (P<0 .0 1) ,在下体正压后与下体正压前、中相比降低均有显著性意义 (P<0 .0 1)。舒张压(DBP)在下体正压中与下体正压前相比升高均有显著性意义 (P<0 .0 1) ,在下体正压后与下体正压中相比降低有显著性意义 (P<0 .0 1) ,与下体正压前相比差异无显著性意义。平均动脉压 (MAP)在下体正压中升高无显著性意义 ,在下体正压后降低有显著性意义 (与下体正压前相比 ,P<0 .0 1,与下体正压中相比 ,P<0 .0 5 )。心率 (HR)在下体正压中降低有显著性意义 (与下体正压前相比 ,P<0 .0 5 ) ,下体正压后与下体正压前差别无显著性意义。下体正压后所有受试者松弛耐力均下降 ,总体上下体正压前为 (3.33± 0 .17) G,下体正压后为 (2 .6 3± 0 .0 9) G,比下体正压前降低有显著性意义 (P<0 .0 1)。其下降值为 (0 .71± 0 .0 6 ) G,最高 1.0 G、最低
Objective To simulate the push pull maneuver using single axis human centrifuge and lower body positive pressure, and observe its effect on +G Z tolerance. Methods Six volunteers participated in this experiment. They were subjected to lower body positive pressure (LBPP) up to 300 mmHg for 1 min. Blood pressure and heart rate were monitored before, during and after LBPP. +G Z tolerance was measured with human centrifuge immediately after LBPP. Results Systolic blood pressure (SBP) significantly increased during LBPP compared with that before LBPP ( P< 0.01 ), and decreased significantly after LBPP compared with that during LBPP ( P< 0.01). Diastolic blood pressure (DBP) increased significantly during LBPP compared with that before LBPP ( P< 0.01) , and decreased significantly after LBPP compared with that during LBPP ( P< 0.01) . Heart rate (HR) significantly decreased during LBPP. To all subjects, +G Z tolerance decreased after LBPP. The decrement ranged from 1 G to 0.5 G. Conclusion Push pull maneuver can be simulated on single axis human centrifuge using LBPP. The physiology effects of LBPP were similar to that of -GZ.
出处
《中华航空航天医学杂志》
CSCD
2000年第2期73-76,共4页
Chinese Journal of Aerospace Medicine
