运动中高血压反应者的心缩间期变化

Changes in STIs of the Hypertensive Responders during Exercise

本文用坐位踏车运动中的心缩间期监测方法(简称“动态STI”)随机检查195名健康疗养现役飞行员。运动中血压反应正常《限最高血压≤26.7/12kPa(200/90mmHg)]者92名(30.72±6.31岁)占47.18％;高血压反应[至少符合:1.收缩压≥294kPa(200mmHg)或连续2次以上>26.7kPa(200mmHg);2.舒张压连续2次以上≥13.3kPa(100mmHg)两条件之一者34名(30.59±6.1岁),占17.44％。高血压反应者与正常者比较,在运动中主要的STI变化为ICT和PEP较长和LVET较短,造成PEP/LVET比值较大,且随负荷量增加而差异愈显著;特别是其最低比值提前于中负荷时出现,至重负荷时反而明显上升,形成具特征的“谷底”现象。表明高血压反应者在运动负荷较重时心肌收缩力减低、心排量和心脏贮备相对较少,因而有可能影响工作能力和飞行耐力。

Using our previously established sitting bicycle ergometric STIs monitoring (including blood pressure) method (abbr.'Dynamic STI'), 195 aircrew in active service were randomly chosen and examined during their yearly vacation with health check-up in the sanatorium 92(aged 30.72±6.31yrs.) of them, that comprised 47.18%, were found to have normal blood pressure (upper limit≤26.7/12kPa) response throughout the exercise test; and 34 (aged 30.59±6.1yrs), that comprised 17.44%, were defined as hypertensive responders, who fulfilled at least one of the two requirements, e.i.(1) SBP≥29.4kPaor>26.7kPax2 and (2) DBP≥13.3kPax2.The main STIs changes in the hypertensive responder as compared with our normal control were a longer ICT and PEP, and a shorter LVET ; as a result the PEP/LVET ratio was larger, and was becoming more and more significant along with the increasing load.Besides, its lowest ratio appeared earlier at medium load stage but then went instead up towards heavy load stage, thus contributing to a characteristic 'Valley bottom ' phenomenon.These results could signify an attenuated rnyocardial contractility and a relatively low cardiac output in the hypertensive responders during heavy exercises; consequently their working ability and flight endurance may be impeded.