Cycling heart rate
I am 72 years old and been cycling for 17 months, did 2200 miles last year and 400 this year. It is April in Penna. I am struggling on hills and this manifests as not getting enough oxygen; really short of breath on hills. My heart rate does not increase at a rate that correlates to my exertion. Throughout the winter I did SPIN classes 3X week, HITT on a stepper machine and rowing machine (same results) and EWOT on the stepper machine (the 90% oxygen worked well). I do at least two 3 hour rides a week to build a good base. BUT the hills reveal the disconnect of effort and heart rate manifested by seamingly lack of oxygen. I have a St. Jude PM2240 device placed in summer 2017.
If you have had a similar issue, please advise what worked for you.