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利用遥测装置，对屏气时心率和颈总动脉血流速度的改变进行了测量，根据各种血流速度参数，计算出反映颈动脉末端血流阻力（可基本反映脑血流阻力）的两个指标─一阻抗指数和脉动指数，对其在４种屏气条件下［立位屏气、卧位屏气、面部温浸水（３５℃）、面部冷浸水（２０℃）］的改变进行了探讨。结果显示：屏气时颈动脉血流速度增加，阻抗指数和脉动指数逐步降低，屏气时间越长，降低越明显。而且，不同于其它３种屏气试验，在冷浸水条件下，于屏气一开始即出现明显降低。提示：屏气时脑血流增加，并且冷水对面部的刺激可诱发潜水反射，促进脑血流的增加。
The changes of heart rate and common carotid artery blood flow were measured by telemetry. Based on the various blood flow velocity parameters, two blood flow resistances reflecting the end of the carotid artery blood flow resistance (which can basically reflect the cerebral blood flow resistance) were calculated Indicators - a resistance index and a pulsatility index, were discussed in four kinds of breath holding conditions [stand-up breath-hold, supine mask, facial warm water (35 ℃), facial cold water immersion (20 ℃)] changes were discussed. The results showed that the carotid artery blood flow velocity increased, the impedance index and pulsatility index gradually decreased, the longer the breath hold time, the more obvious the decrease. And, unlike the other three kinds of breath test, under the condition of cold water immersion, there is a clear decrease from the very beginning of the breath hold. Tip: Cerebral blood flow increases while holding the breath, and cold water stimulation of the face can induce subcutaneous reflex, and promote increased cerebral blood flow.