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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.
The men repeated the 3K time trial 3, 7, 14 and 28 days after donating. The researchers also measured the men's hemoglobin concentration on those occasions. Hemoglobin is a protein in red blood cells that carries oxygen from the lungs to the rest of the body. Three days after giving blood, the men were, on average, 5.4% slower than before giving blood. Performance remained compromised a week later, although not by as much. By the time trial 14 days after giving blood, the men ran as fast as they had pre-donation, even though hemoglobin levels remained 5.9 percent lower.