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Old 05-11-09, 08:07 PM   #1
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orthostatic hypotension

Does anyone else experience orthostatic hypotension lasting for 1-2 days after a long ride? If so, do you take it as an indication that you were riding too hard?

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Old 05-11-09, 08:24 PM   #2
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When I am in shape I experience it on an ongoing basis, as did/do many other racers. When your resting heart rate and blood pressure are extremely low it is unavoidable. With a HR of 40 and a diastolic pressure of 70, standing up quickly means it's going to take a moment for your system to catch up. So you get used to getting out of bed, standing up, etc. slowly.

Beyond that, however, I am sure you will get a litany of responses to the effect of not seeking medical advice from a bunch of strangers on the internet, and I concur with it.

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Old 05-11-09, 09:13 PM   #3
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If you are having dizzy spells for 1-2 days, you should see a doctor regardless of the suspected cause.

Hopefully it will be nothing to worry about, but that kind of duration, I'd want to get it checked out.
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Old 05-11-09, 09:56 PM   #4
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Dehydration can contribute to hypotension, perhaps that would explain why you feel better after a day or two, after you replace the loss of fluids. You should try and limit your pre to post ride water weight loss to perhaps 1%.
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Old 05-12-09, 07:47 AM   #5
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That's an interesting phenomenon. I don't know if there is research supporting a distinct nature of "orthostatic" hypo-tension as opposed to general or situational hypo-tension.

In other words, you want to assume hydration, and or blood volume levels are some how factors in hypo-tension - but what factors make for "lightheaded" symptons?

I have what is known as "labile" hypertnesion -meaning - very changable. After long rides and some workouts I have very low blood volumes {pressures** - yet very seldom get dizzy.

Whatever its cause, it must be something related to the nature of the bloode vessels in the brain. Because - at least in my case - low systemic pressures won't trigger dizziness in me.

I wonder if blood viscosity has anything to do with it - serum levels or factors related to flow?
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