Varicose veins are really just swollen veins and are caused by increased blood volume and pressure on the legs and feet.
静脉曲张其实就是肿胀的静脉，这是由腿部和脚部的血量增加和压力引起的。
Increased blood volume makes your heart work harder to move more blood through your blood vessels, which increases pressure in your arteries.
血量的增加将加重心脏负担，血管内的血量也会随之上升，进而加大动脉的压力。
Your distance runs, of course, produce aerobic gains, including increased blood volume and capillarization, enhanced mitochondrial density and size, and improved slow-twitch fiber development.
你的耐力训练可以提高你的有氧能力，包括增加血液量和斜阳能力，提高线粒体的密度和体积，促进慢肌纤维的发育。
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