I am 55 and about thirty- maybe even forty-pounds overweight. My resting blood pressure is usually around 110/70. Normally when I exercise (about 5X per week) I use the elliptical machine for a thirty minute workout. No matter how hard I push, it is hard for me to get my heart above 120. However, I have lately started using the treadmill (inclined and at a speed of about 4.0 miles per hour) and when I place my hands on the heart monitor gauges my heartrate is shown as 220, then 200, then 190, 180, 170, etc--dropping rapidly-until it settles at about 100. This has happened repeatedly. It happens when I go on the treadmill first and start there or when I go on it after I have been on the elliptical. It has also happened once or twice in the middle of my thirty minute workout just on the treadmill. I don't feel physically stressed. I thought it might be the treadmill machines but I have tried them all and still had this happen. My friend I exercise with uses the treadmills too and she doesn't experience any of these kinds of rapid changes. So it is not he machines. Should I be worried?
Thanks for the advice!