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为观察＋Ｇｚ作用下兔心脏功能的改变，７只新西兰兔经麻醉后依次分别暴露于＋２、＋４和＋６Ｇｚ，峰值持续时间为３０ｓ，增长率为１Ｇ／ｓ，每次暴露后恢复时间为１５ｍｉｎ。记录左心室内压、左心室内压变化速率、心电图等的变化。在＋２、＋４和＋６Ｇｚ作用下，左心室内压峰值较暴露前对照值分别降低６２．９６％（Ｐ＜０．０１）、６３．３４％（Ｐ＜０．０１）及８２．０１％（Ｐ＜０．０１），左心室内压最大上升速率分别降低５８．４６％（Ｐ＜０．０１）、５３．５９％（Ｐ＜０．０１）及６３．０６％（Ｐ＜０．０１），左心室舒张末压分别降低６７．７８％（Ｐ＞０．０５）、３３２．７４％（Ｐ＜０．０１）及５００．５４％（Ｐ＜０．０１）。除ＰｖＣＯ２在＋６Ｇｚ作用后即刻显著升高外（Ｐ＜０．０５），其余动、静脉血气结果在＋Ｇｚ作用后即刻较暴露前对照值均无显著性变化。＋Ｇｚ作用可引起兔心脏泵血功能显著降低。
To observe the changes of cardiac function in + Gz rabbits, seven New Zealand rabbits were respectively exposed to +2, +4 and +6 Gz after anesthesia, the peak duration was 30s, the growth rate was 1G / s, and the recovery time was 15min after each exposure. Record left ventricular pressure, left ventricular pressure change rate, ECG changes. The peak value of left ventricular pressure decreased by 62.96% (P <0.01), 63.34% (P <0.01) and 82.01% (P <0.01) under +2, +4 and +6 Gz, P <0.01), and the maximum rate of increase of left ventricular pressure was decreased by 58.46% (P <0.01), 53.59% (P <0.01) and 63.06% (P <0.01) ), Left ventricular end-diastolic pressure decreased by 67.78% (P> 0.05), 332.74% (P <0.01) and 500.54% (P <0.01), respectively. Except PvCO2 increased significantly immediately after +6 Gz treatment (P <0.05), the rest arterial and venous blood gas results showed no significant change after + Gz treatment compared with that before exposure. + Gz can cause markedly decreased cardiac pump blood function in rabbits.