Occupational injury

For six months now, I've been training scientifically. That is training accordingly with my heart rate. Apart from reaching those training goals I set out to do, I'm fascinated by being in such a direct contact with my body when exercising. If I decrease the intensity of the exercise, of course I feel my heart's response to that. But what gets me going is to actually monitor the heart rate while increasing the pace, say from 7 to 7,3 km/h, and to make comparisons over time. One friend of mine interprets this as "being a control freak". Hm, another friend is more right on track I think "Oh that's just you, you're always so scientific!". Maybe it's an occupational injury.