在体育锻炼时,大脑皮层动员心脏积极工作,因此心跳动比平时加快,心的收缩力也加强,使血液很快地把氧和营养物质输送到全身。经常锻炼,心肌的功能也随之加强。心脏肌肉和身上其它肌肉一样,随着活动加多,肌肉也逐渐发达,长得结实粗壮,心的容积也加大,表现为心跳动变得慢而有力。虽然心跳动变慢,但每次心收缩时所喷出的血量却比平常人为多。也就 In physical exercise, the cerebral cortex mobilizes the heart to work actively, so the heartbeat faster than usual, the heart’s contractility is also strengthened, so that the blood quickly to the oxygen and nutrients delivered to the body. Regular exercise, myocardial function also will be strengthened. Heart muscle, like other muscles in your body, grows more muscular, thicker, thicker and more heart-shaped, with slow and powerful heart movements. Although the heartbeat slow changes, but each time the heart systolic blood volume is more than usual. That’s it