I am confused about my heart rate and the sensation I have when exercising. I have been exercising for one year and 4 months, I am 27 seven years old.
I have been doing mainly cardio, but three months ago I started to do crossfit. I always use a heart rate monitor when exercising. My resting heart rate is close to 45 (according to the hr monitor, and measure by myself is below 48). My confusion comes from this: when I do crossfit, I get my heart rate up to 178 and then I feel a very hard breathing. But when running, I get my heart rate up to 175-180 for 25 min and my breathing is heavy, but not even close to what I feel like when I do crossfit. Actually, I start to feel that very hard breathing only if my heart rate gets close to 190 (when running intervals).
I have tried to do measures by myself, and they are close to the previous I mention (except for running intervals, its harder to measure by myself), so it seems that the monitor is working ok(or at least not bad). Does any one have an idea of what is going on? I just want to understand.