Before I invest in a trip to a sports doctor or medical analysis, I wanted to solicit some opinions.
I'm nearly 50. I had never been particularly athletic or active but started light weight lifting 3 years ago and cycling last year. My toughest ride last year was a 70 mile +5600 ft recreational event.
I did spinning and cross-training over the winter. Now that spring is here, I'm riding 4 days/week, something like 20/20/40/70 for mileage. Most of my riding is on flat/rolling hills, 70-75% of MHR, occasionally higher on a longer hill. Avg speed varies from 16-18mph, so nothing too strenuous.
I'm now starting to feel lightheaded the day after, but not during rides, sometimes even the 20 milers. I talked to my physician last month at my annual exam, but didn't get too much useful in terms of feedback other than that maybe I'm going to hard. I don't think I am. I can talk comfortably while riding and don't have much soreness the next day.
I had all the usual lab work. Cholesterol, blood count, and everything else was extremely healthy. My BP and resting heart rate have been trending down over the last few years as one would expect. Resting heart rate was 70 and this year is consistently 45-50. BP started at 130/70 and is now 95/49.
My regular diet is solid. I'm drinking 16-20 oz per hour (50/50 gatorade/water), and consuming 500 calories per hour (energy bars/bananas) while riding. Avg temperature is 50-60, so I don't think hydration is the issue, and I've cut out my caffeine. Weight is withiin a pound or two before and after rides (I'm 6'1", 183lbs).
I'm starting to think this could be low blood pressure related. Does anyone here have any experience with this, or is 95/49 within normal range for endurance cyclists?