Originally Posted by John Ridley
My wife gives me a hard time when I ride the bike on blood donation days, but so far, so good. I certainly don't try to set any records, either on the way there or on the way home afterwards. I tried to go normal speed on the way there once, it's about 10 miles to the donation spot, and I had to wait 30 minutes for my pulse/bp to get down to where they'd let me give. Last time I just spun in nice and easy, and was well within the range by the time I got to the testing table.
It's funny how non-cyclists feel that one shouldn't cycle if there is rain, if one gives blood, if there is traffic, if it's too remote, etc. The key point after giving blood is not too cycle too hard.
I would actually say something similar: Don't drive after you have given blood, because your reflexes might be a bit low.