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为了比较人体心血管系统在下体负压和立位耐力试验中的变化，本实验观察了１１名男性青年被试者，在阶梯式卧位下体负压（一２．７ｋＰａ、２ｍｉｎ；一４．０ｋＰａ、３ｍｉｎ，一５．３ｋＰａ、５ｍｉｎ和一６．７ｋＰａ、１０ｍｉｎ）试验和２０ｍｉｎ的立位耐力试验时的心率、血压、外周阻力、终末舒张容积、心搏量、心输出量和脑血流图等指标的变化。结果表明，两种应激试验均使回心血量减少，终末舒张容积降低，心脏处于低泵血状态，心率随负荷量增加而增加。在立位试验中，心率只在由卧位变为立位时发生一次性的明显增加，舒张压和平均动脉压的变化明显高于下体负压试验中的变化。脑血流图在两种试验中呈现相反趋势的变化。
In order to compare human cardiovascular system changes in the lower body negative pressure and standing endurance test, 11 young male subjects were observed in the step-down supine body negative pressure (a 2.7kPa, 2min; 0kPa, 3min, a 5.3kPa, 5min and a 6.7kPa, 10min) test and 20min standing position endurance test heart rate, blood pressure, peripheral resistance, terminal diastolic volume, stroke volume, cardiac output and cerebral blood Flow chart and other indicators of change. The results showed that both stress tests reduced the amount of blood returned to the heart, the volume of terminal diastole decreased, the heart was in a state of low blood pump, and the heart rate increased with the increase of the load. In standing test, the heart rate only changed from supine position to a one-time significant increase, diastolic pressure and mean arterial pressure changes were significantly higher than the lower body negative pressure test changes. Cerebral blood flow diagrams showed opposite trends in both trials.