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Monday 23 November 2009 | Personalise | Help  
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 rob bywater
Posted: 29/01/04 10:37:33 33
Message: arthur, biology lesson: to return blood to your heart, the veins in your legs must work against gravity. this is accomplished by muscle contractions in your lower legs, which act as a pump & toned elastic vein walls that help blood return & and tiny one-way valves in your veins. the valves open as blood flows toward your heart and close to stop blood from flowing backward.
varicose veins occur when the valves in your veins malfunction. as you get older your veins can lose elasticity, causing them to stretch out. when that happens, blood that should be moving toward your heart may flow backward. blood pools in your veins, and your veins enlarge and become varicose. The veins appear blue because they contain de-oxygenated blood, which is in the process of being recirculated.
as a cyclist the veins in your leg are enlarged and as a result the blood tends to pool, so we are unfortunatly susceptible to them. sean yates has particularly bad veins. you can have them removed surgically if they are a problem.
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