等长收缩运动反射性增加动脉血压,且这种升压反应与肌肉收缩强度、参与肌群的大小和持续时间有关。以往对正常人进行了小肌群亚极量等长运动的研究,提示血压和心功能无明显变化。但对大肌群极量持续等长收缩时左室功能状况所知甚少。本研究的目的在于:①应用放射性核素血管造影连续观察站立位提举时左室功能是否降低;②评估运动 Isometric motor reflex increases arterial blood pressure, and this step-up response and muscle contraction strength, the size and duration of participation in muscle groups. In the past, the study of submaximal isometric exercise of the small muscle group in normal subjects showed no significant changes in blood pressure and heart function. However, the great muscle group very long continuous contraction of left ventricular function is poorly understood. The purpose of this study was to: (1) use radionuclide angiography to continuously observe whether left ventricular function was reduced in standing lifts; (2) to evaluate exercise