My question to you is this… what is the avgerage heart rate while working out ( like max rate )… I ask because I was working out at a gym one day on a bike trainer that had a heart rate reader on it. I rode for over 1 hour at a high rate of speed, half way in my heart was beatting over 170 beats per minute… About 20 minutes later I was able to hold a heart rate of almost 200+ beats per mntue for about half an hour. The weird part is that i never once felt sick, dizzie, light headed, nothing… I felt fine the WHOLE time…
The standard forumula is HRmax = 220 − age so it would sort of depend on how old you are? That’s not 100% precise but seems to get pretty decent results for aiming at targets working out. As long as you feel fine, I would think you’d be ok. Sometimes I’ve noticed my HR running lower when my BG drops but this doesn’t seem to be usefully reliable.
I wanted to add that I think in terms of the question in the thread topic, they usually look at your resting heart rate to determine how strong your heart is as the greater the difference between resting and HRmax, the more reserve “power” your heart has. If you do a lot of cardio, you may perceive a drop in your resting heart rate although if you are working out at HRmax for an hour, you may already be there?
Although Acidrock is right about the standard formula, it is just an average and your max (as well as your resting) heart rate can vary quite a bit from the average.
Several years ago when I used to exercise with a heart monitor, my heart rate would go way above the max rate as determined by the formula. But it also quickly dropped when I stopped strenuous exercise. If you’re in good shape, your heart rate should drop quickly after you reduce the intensity of your exercise. Someone gave me the heart monitor as a gift and I really never learned to use it correctly. Ideally if you really want to use a heart monitor, you should have a trainer help you determine your max rate and target heart rates. I never could have done my aerobics classes if I didn’t go above the max rate as determined by the formula. And like you, I felt perfectly fine.
One other thing to remember is that the heart rate monitors on gym equipment can be totally inaccurate, so the numbers you got may be meaningful or not meaningful at all.
As I get older and now have had Type 1 for 35 years, I know that I need to be cognizant of heart issues. I’ve said before and I’ll say again that I wish there were some Type 1-specific heart studies. Especially studies of people with relatively well-controlled diabetes.
Because high cholesterol, high BP, heart problems, etc. seem to be an integral part of the disease process with insulin resistance and Type 2 diabetes, I just never feel that heart studies related to Type 2 are that relevant to me. Heart problems may arise as a complication of Type 1, but I don’t feel that they are part of the disease process. Although an automimmune process killed my pancreas, it didn’t give me insulin resistance, high cholesterol, or high blood pressure. But on the other hand, I’m suspect that it’s naive to think that high blood sugars through the years haven’t done damage to my circulatory system.
at rest my heart rate is around 50 bpm
I think that woud qualify as “strong”? 
While this is the “standard” equation, here is a bit of interesting history: the “study” that came up with that equation had a whopping 11 participants. The equation is statistically unreliable. Unfortunately, without actually testing for your max heart rate, it’s as good as anything else out there.