What did I do wrong? re: nutrition? - Page 12 - Cycling Mob: Road Cycling, Mountain Biking and More

06-07-2004, 02:58 PM

curt wrote:

> Interesting Terry. I can ride 40 or so miles really hard on next to nothing
> in my stomach. For some reason this 75 was too much for me on what I ate.

I guess 40 was still short enough that your glycogen stores were
sufficient. Maybe you've gotten very good at fat metabolism. If you
train for a long time in zone 2 (66-72% of max. heart rate), you
reportedly increase your fat metabolism, which reduces the glycogen
depletion rate when you're working at higher levels.
--
terry morse Palo Alto, CA [Only registered and activated users can see links. ]

06-07-2004, 03:15 PM

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:

[Only registered and activated users can see links. ]

(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 [Only registered and activated users can see links. ]

06-07-2004, 03:15 PM

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:

[Only registered and activated users can see links. ]

(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 [Only registered and activated users can see links. ]

06-07-2004, 03:15 PM

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:

[Only registered and activated users can see links. ]

(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 [Only registered and activated users can see links. ]

06-07-2004, 03:15 PM

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:

[Only registered and activated users can see links. ]

(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 [Only registered and activated users can see links. ]

06-07-2004, 03:15 PM

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:

[Only registered and activated users can see links. ]

(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 [Only registered and activated users can see links. ]

06-07-2004, 04:20 PM

> > 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.

This has happened to me once--months before I started the low carb diet. I
had finished strong after a 100K ride and came to a sudden stop at the
finish line. I immediately got off the bike and put it on the car's rack.
Standing there, talking to a guy, I became dizzy and had to sit down on the
curb.

Pat in TX

06-07-2004, 04:20 PM

> > 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.

This has happened to me once--months before I started the low carb diet. I
had finished strong after a 100K ride and came to a sudden stop at the
finish line. I immediately got off the bike and put it on the car's rack.
Standing there, talking to a guy, I became dizzy and had to sit down on the
curb.

Pat in TX

06-07-2004, 04:20 PM

> > 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.

This has happened to me once--months before I started the low carb diet. I
had finished strong after a 100K ride and came to a sudden stop at the
finish line. I immediately got off the bike and put it on the car's rack.
Standing there, talking to a guy, I became dizzy and had to sit down on the
curb.

Pat in TX

06-07-2004, 04:20 PM

> > 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.

This has happened to me once--months before I started the low carb diet. I
had finished strong after a 100K ride and came to a sudden stop at the
finish line. I immediately got off the bike and put it on the car's rack.
Standing there, talking to a guy, I became dizzy and had to sit down on the
curb.

Pat in TX