目的　探讨健康青少年之常见现象 ,被误以为是体位改变不耐受引起直立性眩晕症和一过性低血压的关系。方法　对 2 3名健康青少年进行垂直倾斜 70°-3 0°试验 ,并连续测量心率和血压 ,使用静脉测量仪测量上肢和下肢的血流速度及静脉压。结果　健康青少年正常的血管张力能维持垂 Objective To investigate the common phenomenon of healthy adolescents and to be mistaken for the relationship between orthostatic vertigo and transient hypotension caused by the change of posture intolerance. Methods Twenty-three healthy adolescents were vertically tilted 70 ° -3 0 ° and their heart rate and blood pressure were measured continuously. The blood flow velocity and venous pressure of upper and lower extremities were measured with a venous meter. Results Healthy young normal vascular tension can maintain the vertical