197 during your first slow mile? Something wrong either with you or your HR detector – probably the latter!
I haven't seen 190s in about 25 years........
My max HR was already well under 170 when I first thought about such things in my 40s. But I do see 190s when my heart goes into arrhythmia.
Fortunately haven't had problems with arrhythmia.
Mine used to bounce up that way when I had atrial flutter. Not gotten near that since that was “fixed”. Can’t run as fast either.
No problems with flutter, either. But certainly can't run as fast.