Yeah. When your doc is running all the tests, be sure s/he checks you for hypochondriasis.

Docs who examine you are more qualified to make this evaluation than bike geeks who can't -- even if some of them are docs (and I'm not one of them)

A lot of people experience what you describe. I know I have for as far back as I've been paying attention. Stand up quickly and feel like passing out because the blood rushed to your legs? Sounds pretty straightforward which is why it never occurred to me to ask. But an actual doc could probably tell you what is going on.

:roflmao2:

I get the same attitude at home. Why should the 41 be any different?

It happens to me a lot a few hours after a big ride. For me, there seems to be a link to being a bit dehydrated and low on electrolytes. Downing a quart of Gatorade seems to help.:o

I also experience this.

My cardiologist did all kinds of test, ECG, Thread-mill stress test, Carotid ultrasound, 3D echo of the heart, Complete Blood count. Everything came out okay. Test were just to make sure nothing is wrong.

fify. ;)

http://m.youtube.com/#/watch?v=-A9kso0ZfvU&desktop_uri=%2Fwatch%3Fv%3D-A9kso0ZfvU

This used to happen to me all the time after rides. Doctor told me to drink more water during the 4 hours after a ride. The problem went away. I wasn't re-hydrating properly.

Who you calling sugar?

In my mind this makes a lot of sense. Dehydration=reduced blood volume=reduced blood pressure? Any of you medical professionals care to comment?

I have the same thing, orthostatic hypotension. The feeling of practically blacking out is called head-rush, went through an entire year of neurological and arrhythmic testing to finally be diagnosed. It started when I suddenly lost a lot of weight. I used to be 360 pounds, I got sick in the summer of 2010 and lost 150lbs in just a 4months. I was barely eating when I was sick, when I would stand up I would practically black out. My head felt like it had so much pressure in it, it would explode. It only lasted a few seconds and everything cleared. Since I picked up cycling after I recovered I was able to keep the weight off but If i dont consume enough calories per day I get the head-rush, and I get it bad
2 things you need to do. The hardest thing to do is be disciplined with what I eat now, but the worst thing is if I dont eat enough I get the worst symptoms whenever I stand up
1.) increase your fluid intake: gatorade, peialyte(I know it tastes disgusting but it quickly replenishes electrolytes)
2.) make sure youre eating enough. If you dont consume enough calories the head-rush will get worse.

Good Luck with everything

Yes. I already said this. Sheesh, you guys are thick.

There's a medical condition call post exercise hypotension. As you exercise, your blood vessels expand, increasing their volume and reducing blood pressure. If I exercise in the early morning hours say from 5:00-6:00, get home and eat a light breakfast. I'll conk out for an hour. My BP will drop to 98-96/58. My heart rate will slow down as well but not go much below 56. I'm 58 YO, and it was quite aggravating for this to happen and in my 20's and it'd affect me anytime of day. Even into my 30's and then my BP was 85/55. I've fainted standing up after a hard day's hiking. Usually 1-2 cups of coffee will keep it at bay though I've been known to have two cups of coffee after exercise and take a light snooze. My wife gets so amped up by exercise, she can't sleep. I'm completely opposite.

Happens to me too. But only when I hammer real hard, lay on the couch for a long time and then suddenly pop up.

This happens to me at work all the time after prolonged stretches on the office chair, particularly on days where I've ridden before going in to work. It can be awkward when you stand suddenly to speak to someone and you can't focus on them for a moment while you try to regain normal vision. Definitely seems to have a correlation to hydration levels, though.

OP- I moved from Miami a year ago, but in all my time riding there, I needed some sort of gatorade/drink mix in at least one of my bottles. Even in the "winter", you might not think you're sweating that much/losing that much sodium, but you are. Come summer, I could go through 2 24oz bottles of mix/water in an hour and still be thirsty. Just fill up at La Carreta's water cooler every 2 laps of KB, because as everyone down there knows, that's pretty much the only ride anyone does.

Haha, I'm actually riding there tomorrow. I'm doing my usual Doral-KB-Doral Sunday ride. I live in Doral so I ride around here instead. I think it might have to do with me only drinking plain water during my rides. After today's ride, I noticed a significant amount of sweat on my face and helmet straps. I drank a little more than 3 24oz bottles of plain water for 2 hours and a half. I'm going to try a half Gatorade/water and see if things change. My stomach would always hate me if I drank Gatorade either while riding hard or just before sprinting. Water goes does easily so I've stuck with it. And then up my water intake after I ride. And if all else fails, I'll just have to deal with the almost fainting.

No, you're just boring...

I wish I could have low blood pressure problems. I do keep it in the normal range but it would easily go up if I reduce exercise.

lol