What did I do wrong? re: nutrition?

Amh

Terry Morse <tmorse@spamcop.net> wrote in message news:<tmorse-F32CE2.15153607062004@news.covad.net>...
> amh wrote:
>
> > I don't usually get dizzy after a ride but I can tell
> > you that I sometimes get dizzy after running. Sometimes
> > it is after a long run or a short run, I can't predict
> > when I'll get this way. A few times it was obviously
> > because I hadn't eaten properly before running. I
> > attribute my dizziness to low blood pressure. I usually
> > do the put the feet above my head if I feel it is
> > necessary. And whatever dizziness passes.
>
> You're describing post-exercise hypotension, a well known
> (but not well studied) symptom. When you stop exercising,
> the heart rate quickly slows down. This reduces the blood
> flow, and the blood pressure drops. Putting your head
> between your knees should prevent fainting. There's an
> article here that briefly explains what's going on:
>
> http://www.afpafitness.com/articles/Pressurelink.htm

Thanks.

>
> (scroll down to "Cardiovascular response following
> exercise")
>
> I supposed a "warm down" period would reduce the plummet
> in blood pressure, but sometimes that's not possible. On a
> group ride last year, one of the riders got to the top of
> a long climb and began a gentle descent. He passed out,
> fell and broke his femur. Not good.

I've never had the dizziness on a bike unless I was
famished, I mean famished. I kind of like the feeling after
I run though.

Andy

Curt

"Terry Morse" <tmorse@spamcop.net> wrote in message
news:tmorse-F32CE2.15153607062004@news.covad.net...
> amh wrote:
>
> > I don't usually get dizzy after a ride but I can tell
> > you that I sometimes get dizzy after running. Sometimes
> > it is after a long run or a short run, I can't predict
> > when I'll get this way. A few times it was obviously
> > because I hadn't eaten properly before running. I
> > attribute my dizziness to low blood pressure. I usually
> > do the put the feet above my head if I feel it is
> > necessary. And whatever dizziness passes.
>
> You're describing post-exercise hypotension, a well known
> (but not well studied) symptom. When you stop exercising,
> the heart rate quickly slows down. This reduces the blood
> flow, and the blood pressure drops. Putting your head
> between your knees should prevent fainting. There's an
> article here that briefly explains what's going on:
>
> http://www.afpafitness.com/articles/Pressurelink.htm
>
> (scroll down to "Cardiovascular response following
> exercise")
>
> I supposed a "warm down" period would reduce the plummet
> in blood pressure, but sometimes that's not possible. On a
> group ride last year, one of the riders got to the top of
> a long climb and began a gentle descent. He passed out,
> fell and broke his femur. Not good.
> --
> terry morse Palo Alto, CA http://bike.terrymorse.com/

This is interesting. This may be the case. I did a 70 mile
very hilly ride a few weeks ago and I had a good cool down
and had no problems. This past 75 mile ride was rolling
hills, but ended all up hill and I was pushing hard. I just
stopped at the end, with no cool down at all and seemed to
have more problems. I still don't think I ate enough, but I
guess over time, I will figure out what works best for me.

Thanks for the link, Curt