After donating blood, most medical professionals will tell you to abide by certain restrictions when it comes to physical activities. Normally, you're giving a pint of blood during your visit, and it takes time for the body to replenish this loss. Exerting yourself before your body has replenished its blood supply could lead to some undesirable side effects.
Exercise
It's best to abstain from both heavy lifting and strenuous exercise after giving blood, according to the American Red Cross. This recommendation, however, applies only to the day of your donation. If you want to lift weights the next day, feel free to head to your local gym and work out as normal.
Time Frame
While they're only taking a pint of your blood, your body has 10 to 12 pints at any given time. It takes roughly 24 hours for the body to replenish the pint of blood that is removed. This is the main reason why you shouldn't lift anything heavy or exert yourself strenuously on the day of your donation. Even if you're relatively fit, you should follow this recommendation. Light to moderate exercise, on the other hand, is most likely fine, notes the University of Southern California Blood Donor Center.
Effects
Lifting weights or taking part in strenuous exercise may lead to dizziness as well as weakness or fatigue. If you do experience any dizziness, weakness or fatigue, rest and drink some fluids, particularly those containing calories. Juice, sports drinks and even soda can help to alleviate these side effects.
Donation
Before donating blood, make sure you've eaten breakfast if your appointment is earlier in the day and both breakfast and lunch if your blood is being drawn later in the afternoon. Also, try to include foods that are relatively high in iron, such as red meat, legumes, nuts, seeds, chicken, fish, beets, peas, green leafy vegetables or iron-fortified cereal.
