I had a run on the treadmill today. One of many, so I'm accustomed to where my HR should be, and that is typically between 130 and 155. Today, same 4.3 km workout, and starting with 'High' training readiness and BB about 80, it ranged between 160 and 197. Recovery time of 95 hours. Exercise load 323! Now, I was not even tired at the end, or out of breath at any time during the workout. For context, I'm 68 years old, and 25 years ago I had a lab-tested max HR of 186. So 197 falls into the 'ridiculous' category. After getting off the treadmill, I manually counted my HR at 96 (16 over 10 sec) while the watch was saying 139.
Yesterday, I had a much harder bike ride (outside). My usual 23 km, one-hour route. I did it two minutes faster than I did on Sept 26. Yet on last month's ride my heart rate averaged 130 and maxxed at 160, while yesterday the numbers were 109 and 130. Exercise load, 101. I've never had such a low average heart rate on rides, or such low exercise load. So the HR was reading unreasonably low yesterday.
I don't know what to make of these figures, except that they completely throw off any of the analytical metrics derived from them.
