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Curious, cycling related health problem?(6 posts)

Curious, cycling related health problem?rwbadley
Aug 23, 2002 7:56 AM
I have always been a fairly active person. Five years ago I developed tendinitis in one sport, and decided to move back more into cycling for fun and fitness. Over that five years I have gradually increased miles, intensity, and duration.

Five years ago my blood pressure was about 135/75-80, with a resting pulse of 60 or so. Now, my blood pressure is in the range of 120/65-70 with a resting pulse of 48-50.

These look like good numbers, but I have noticed that I am now more prone to sudden onset dizziness. You know, the old 'stand up and get a headrush ooh I gotta sit down' feeling. This happens more in the morning, but can happen at any time during the day.

Would these seem related? Or am I looking in the wrong direction...

There's an exercise-related reason, but I forget what it is...Silverback
Aug 23, 2002 8:07 AM
Get checked out by your doctor, of course, to rule out anything serious. But I've had similar experiences a couple of times when I was in peak shape (not this summer, unfortunately). I had complete physicals both times, and the (separate) doctors agreed that it was probably related to the exercise.
I can't believe I've forgotten the exact physiology of it (last time was four or five years ago), but something about blood flowing to the large muscles of the legs, and when you stand up, it takes a second for your body to adjust and send some to your brain. One of the docs is a pretty serious cyclist, and he said it happens to him, too.
Postural hypotensionSuddha
Aug 23, 2002 8:26 AM
I.e., low blood pressure dependent on posture. It is a common thing for well-conditioned people. Ever notice too, that no matter how fit you are, jogging up the steps at work after sitting at your desk all day can leave you winded with a racing pulse? I think it's the irony of fitness. But I'd rather have these problems than hypertension, diabetes and blocked arteries.
Thanks for the reassurance, LBP seemed to make sense...nmrwbadley
Aug 23, 2002 9:02 AM
Thanks for the reassurance, LBP seemed to make sense...nmJon Billheimer
Aug 23, 2002 9:34 AM
I have the same problem and have had for years. The better shape I'm in the pronounced the effect is. I believe that the above poster's explanation is correct. It has to do with the heart's larger stroke volume and consequent slower rate of contraction, so when you stand up it takes the heart a bit longer to compensate for the change in blood pressure in your extremities. When I took ex. phys. this phenomenon was discussed a bit. Nothing to be alarmed about.
I like to think of it as a free & legal high nmPdxMark
Aug 23, 2002 12:51 PM