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目的：探讨分次不同角度头高斜位暴露下，正常人体心血管反射与调节特征，从而筛选出有效的倾斜试验生理评价指标和最佳技术方案，为飞行员专项医学选拨和鉴定服务。 方法：采用自行研制的多功能双向式医用倾斜床，结合十二导联同步心电图描记方法和经颅多普勒脑血流成像技术，对２０名健康自愿者进行分次不同角度（＋６０°／次、＋７５°／次、＋９０°／次）头高斜位暴露下的心率、血压、心率变异（ＨＲＶ）和脑血流速率的测量与分析。 结果：①与暴露前比较：暴露后心率明显增快，平均ＲＲ间期和脉压差明显缩小，有显著性差异（Ｐ＜０．０５～０．０１）；ＲＲ间期标准差在＋７５° ２０′和＋９０° ２０′明显缩小，有显著性差异（Ｐ＜０．０５）；心率变异系数在＋９０°明显缩小，有显著性差异（Ｐ＜０．０５）；收缩压除＋６０°即刻外均明显下降，有显著性差异（Ｐ＜０．０５～０．０１）；舒张压在２０′时段明显升高，有非常显著性差异（Ｐ＜０．０１）；收缩期最大血流速率在＋６０°２０′和＋７５°即刻、＋７５°２０′、＋９０°２０′均明显下降，有非常显著性差异（Ｐ＜０．０１）；平均血流速率除＋９０°即刻外均明显下降，有显著性差异（Ｐ＜０．０５～０．０１?
OBJECTIVE: To investigate the characteristics of cardiovascular reflex and regulation of human beings exposed at different angles and at different angles, and to screen out the effective physiologic evaluation index and the best technical scheme of tilt test for the selection and identification of pilots. Methods: A total of 20 healthy volunteers were divided into different angles (+60 ° / °) using a self-developed multi-functional two-way medical tilt bed combined with 12-lead synchronous electrocardiography and transcranial Doppler cerebral blood flow imaging (+ 75 ° / time, + 90 ° / time) HRV and cerebral blood flow rate under head-high oblique exposure. Results: ①Compared with pre-exposure, heart rate significantly increased after exposure, mean RR interval and pulse pressure difference decreased significantly (P <0.05 ~ 0.01); RR interval standard deviation was at + 75 ° (P <0.05). The coefficient of variation of HR was significantly reduced at + 90 °, with significant difference (P <0.05). Systolic pressure was + 60 ° (P <0.05 ~ 0.01). The diastolic blood pressure increased significantly at 20 ’, with significant difference (P <0.01). The maximum systolic velocity was + 60 ° 20 ’, + 75 ° 20’ and + 90 ° 20 ’decreased significantly (P <0.01). The average blood flow rate decreased significantly at + 90 ° Sex differences (P <0.05 ~ 0.01?