shishigami
Bluelighter
- Joined
- Feb 4, 2011
- Messages
- 890
Should I expect a marked increase in the effects at a constant dose if I take the dose 3 days after donating blood (standard donation). I've been eating well and keeping relatively hydrated.
How much blood is taken — won't it make me weak?
A blood donation equals approximately one pint of blood. The average adult body has 10-12 pints. The vast majority of people will not feel any different because of the donation. A very small percentage may experience temporary dizziness, but some rest and fluids will help you feel better quickly. Your body will replace the lost fluid within 24 hours.
What are the effects of donating blood on scuba diving?
"For the first few hours/days after donating blood, the person will be more susceptible to fainting and will have a reduced exercise capacity. After the blood volume that was lost in the donation is replaced, the person will no longer be prone to fainting and might actually have a slightly improved exercise capacity. There are theoretical slight increases in the risk of oxygen toxicity and DCS but this change in risk most likely has no practical significance. You should never dive (nor do other strenuous activity) the day of a blood donation and should be sure to drink lots of nonalcoholic fluids after donating blood. It should be okay to do conservative dives the next day but if you want to be absolutely certain you have recovered from the acute effects of donating blood, wait 72 hours."
"A study has been done looking at the effects of blood donation on exercise performance in competitive cyclists. This study evaluated 10 male cyclists before and after phlebotomy (donating blood), to determine the effect of donation of one unit of blood on exercise performance. Each subject underwent maximal exercise testing with oxygen consumption measurement at baseline, 2 hours after phlebotomy, 2 days after phlebotomy, and 7 days after phlebotomy. The results found that maximal performance was decreased for at least one week and that submaximal performance was unaffected by blood donation.
Thus, if you are a competitive cyclist, do not donate blood within 7 – 10 days of a competitive race, as your performance will be compromised. If you are a casual cyclist performing submaximally, you may not experience any deleterious effects apart from a higher heart rate than normal from the day after donating."
Fainting, Dizziness
According to World Blood Donor Day, approximately 1 pint of blood can be withdrawn from your body in a matter of 10 minutes. The average adult has approximately 10 pints. This means a transfusion reduces your overall blood volume by 10 percent. According to the American Red Cross, your body can increase volume within 24 to 48 hours if you drink plenty of fluids. However, until that time, you are at risk for experiencing symptoms common for reduced blood volume. These include fainting and dizziness as a result of lower blood pressure throughout the body. The combination of low pressure and reduced volume can also reduce the oxygen supply to the brain.
Fatigue
Your body will replace the fluids within 24 hours with increased fluid intake but will take several weeks to replace all of the red blood cells. According to the Mayo Clinic you should avoid strenuous physical activity for five hours to give your body time to acclimate to the reduced volume and resulting fatigue. You may feel fatigued for the first day after donating blood but that should pass quickly.
It takes 24 hours for the lost liquid to be replaced and another 24 hours (2 days total) till the plasmaprotein's are regenerated.
i don't see a problem tripping 3 days after donating blood.