I would suggest that they do an exercise test and find out what their maximum heart rate is. Generally, maximal heart rate with exercise equals 220 minus the age. But that value can vary by plus or minus ten percent. So for a person age 39 the average heart rate with exercise would be 181, plus or minus ten. So what he really needs to do is a treadmill to determine what the maximum heart rate is.
Training can affect how high the exercise heart rate goes.
My doctor said this is a common condition that requires no treatment. We can not answer this without further information. I am postmenopausal, taking estratabs and progesterone. I have gained 30 lbs. I exercise but cannot get out and run because I am allergic to everything.