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炎热的夏季,为了肌体的正常散热,人体内的循环系统产生了一系列的变化,体表血管扩张,血液调整“布局”。当气温达30℃以上时,皮肤的血流量则增加3-5倍;血流速度也加快,以增加“体表散热量”。当气温达到35℃以上时,心脏搏血量则增加50％-70％。这些血身调整的生理活动依赖于心脏。心脏通过加速心跳频率、激增心血输出量,加重心股“泵”血负荷等运动来调整体内热度。
Hot summer, in order to the body’s normal cooling, the body’s circulatory system has produced a series of changes, the surface of blood vessels to dilate, blood adjustment “layout.” When the temperature is above 30 ℃, the skin’s blood flow is increased 3-5 times; blood flow speed is also increased, in order to increase the “body surface heat.” When the temperature reaches above 35 ℃, heart stroke volume increased by 50% -70%. These blood-regulating physical activities depend on the heart. Cardiac heart rate by accelerating the surge in blood output, increase the heart of the “pump” blood load and other sports to adjust the body heat.