工期高血压病50例坐位踏车心缩间期变化观察

CHANGES OF STIs DURING SITTING ERGOMETRY IN 50 STAGE I HYPERTENSIVE PATIENTS

本文对50例男性Ⅰ期高血压病患者,采用耳密度图导数图、心电图和心音图三项同步描记的方法进行坐位踏车负荷中的心缩间期变化观察。主要的发现是PEP、ICT和PEP/LVET比值较正常对照组大,且随负荷量的加重而更显著,尤其PEP/LVET的最低比值(称“谷底”值)出现较早。提示此类患者在重负荷时心肌收缩力减低,心脏贮备相对较少。

The changes of STIs during sitting bicycle ergometer exercise in 50 stage Ⅰ hypertensive men (aged 35～60 years) were investigated by using ear densitography. The exercise load was heartrate targeted (calculated from the resting HR) as (1) light load-HR increased≥50%, (2) medium load-HR increased≥80%, and (3) heavy load-submaximal HR(85% of maximal HR or 190-age in years). The main findings as compared with those of normotensive control group during exercise were a greater BP reaction, a longer PEP and ICT, and a larger PEP/LVET; besides, the latter reached its lowest (called'valley bottom') value earlier at medium load stage whereas subsequently went up towards heavy load stage. These findings signify an attenuated myocardial contractility at heavier exercise load together with a relatively lower cardiac reserve in the early hypertensives, and consequently their working ability and endurability would be impeded at rigorous task conditions.