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Answer Wiki. Summary: peak running performance after donating blood may be impacted for up to 1-2 weeks after donating 1 pint of blood, but is most noticeably impacted within the first 1-2 days after donating when attempting to perform at peak levels during endurance activities.
However getting blood back from the legs isn't so easy. There is no heart in the leg and so the body needs a different way to get blood back to the heart. After the blood has been through the tissues, delivering oxygen and food to keep the cells alive, it collects together in the veins.When you are lying down, there is just enough pressure left in the blood to get flow back to the heart.fter the blood has been through the tissues, delivering oxygen and food to keep the cells alive, it collects together in the veins. When you are lying down, there is just enough pressure left in the blood to get flow back to the heart.