After working out on my elliptical for a half an hour, I have noticed that my forehead is bright red on the right side and pale looking on the left side. It seems to go away after about a half hour to an hour. I seem to get my wind back shortly after my workout and don't feel dizzy at all. I am getting my heart rate up to about 170 by the end of the workout. I did notice the same thing happening a couple of years ago when I was working out at a Aikido dojo and have just recently started working out again. I am 49 years old.