I gave a pint of blood on Tuesday. Friday I have PT, running etc. Will the blood I donated affect my workout?

Question

I went to the gym today(thursday) and felt really tired and weak, thats why I ask

Answer 1

If you gave blood Tuesday, it shouldn't effect you Friday.  Did you work out Wednesday?  If you hit that workout hard, it may be rolling over to Thursday, or you could just be having one of those days where you're simply tired.

Answer 2

well, from what my coach said, he said we should never donate blood during cross country season because since oxygen travels in your blood, and you donated your blood, that means you'll get less oxygen. and you need lots of oxygen to run well =) but i dont think it would affect you a lot. the only thing might be that you might feel a LITTLE bit more tired than normal. but it should be fine in a week or two

Answer 3

Less blood = less red blood cells = less oxygen to your muscles = you not up to your peak performance

Eat well and stay hydrated.  The effect will diminish relatively quickly.