Originally Posted by
beeballman
So I did 42.5 miles today, felt good on the ride. Came home showered, sat down on the couch for a few minutes. When I got up went towards the kitchen and felt myself getting lightheaded and I grabbed the kitchen chair. Next thing I remeber is my wife standing over me. Has this happened to anyone else after a ride? Going to get checked out tomorrow at the Dr. Sucks when you had a good ride and ends this way. Banged my elbow and the back of my head took a glancing blow off the french door in the living room.
I can think of a couple things: first, low blood sugar. Second, dehydration followed by a hot shower. The heat dilates blood vessels, exacrebating any baseline hypotension from dehydration. Standing up always induces some postural hypotension, but in the presence of dehydration and/or vasodilation it could well have been too much for your system to accommodate.