TScott27 wrote:Exerting much effort would sometimes make you feel dizzy afterwards. In fact, this happened to me twice right after jogging my favorite trail. Consulted a doctor afterwards but he said that my vitals are normal. I think you just need to do it gradually, try to start out with 10 minutes(or maybe lesser) and see if the same thing happens. If you don't feel dizzy after a 10-minute ride, then maybe you should stick to it for a while and build your way to reaching the 15-minute ride.
I agree with it being unlikely that the dizziness is particularly worrisome/worthy of a doctor/worthy of any special equipment given only the information presented. I also agree with the concept of building up duration and intensity gradually, but the issue seems to be with intensity and duration of intensity rather than duration/endurance at low intensity.
I agree about the importance of wearing sunglasses; and even cheap ones may work fine
. I also agree with RayMondo's other points, especially about the cool-down phase seeming to be key to the issue described. The breathing, stretching, and movements involved in yoga would be good. I almost mentioned eating fruit (like apples) myself.
Not sure what the OP is riding (guessing a basic mountain bike)—I was much dizzier than normal on my road bike today. Observations: I did not do warm up activites, nor bring anything to help cool off once hot. Steep hills began early in the ride. It was warm—mid 80’s with bright/hot mid-day June sun (this also created a lot of visual contrast in partially shaded areas). My tires were inflated toward the higher end of the spectrum (more vibration and bumps felt). I had more than a couple of beers the night before, which is unusual.
My neck, shoulders, and upper back were very tight from weightlifting and child tossing
previous days—this did not help circulation and relaxation for optimal bloodflow to the head and elsewhere. Also, the possibility of feeling dizzy was fresh in my mind from this thread...bad state of mind
. I felt best on the flats at the very end of the hour long ride.
If motion sickness might be a problem, I’d use the same strategies one would use to avoid motion sickness while in a car—look far ahead on the road/path wearing sunglasses, try to avoid bumpy conditions, try to avoid lots of sudden ups, down, and turns, try to stay cool and comfortable, and try to go into the ride feeling as good as possible (hydrated, fed, rested, energized/warmed-up).