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本研究用连续和非侵入性的方法观察中度的LBNP对人脑循环的影响。实验对象为8位健康青年人，在产生LBNP的装置中仰卧，先测30min的基础值。LBNP施加方案为：10mmHs2min、20mmHg3min、负压增至30mmHg持续25min。测定指标：①每分钟测心率和血压；②用颈动脉多普勒流量计测定左颈
In this study, continuous and noninvasive methods were used to observe the effect of moderate LBNP on human cerebral circulation. The subjects were 8 healthy youngsters who were supine in a device that produced LBNP and were initially assessed for 30 min. LBNP application program: 10mmHs2min, 20mmHg3min, negative pressure increased to 30mmHg sustained 25min. Determination of indicators: ① measure heart rate and blood pressure every minute; ② carotid artery Doppler flowmeter measured left neck