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Can one get out of HR lock?

StephanKistner
over 1 year ago

The image shows an example of a terrible HR lock. Where my HR was supposed to be between 165 and 180 (green markup) it went up to 200+ (1:25:18). The section between the two purple lines is where the watch went way off.

Since the watch didn't want to 'calm down' I took it off for a few seconds and put it back on - then it locked down to around 75bpm, and later went up to 120bpm Confused 

I tried again and again (see the gaps), with different wrist positions too, but only after I stood still for 3 minutes did it manage to lock on to my real HR at 145bpm at that point (also I temporarily paused the activity). 

I know there are a couple of reasons why the sensor may pick up an erroneous hear rate signal, but is there any way get out of a lock mid run? Like "forget what you read the past hour - start from scratch again"?

  • 0 over 1 year ago

    I've observed cadence lock many times. Often it happens when running a long downhill. Normally on a downhill HR should drop. However with the optical sensor sometimes the HR goes up in step with the increased cadence and refuses to go down no matter what I do. Even if I stop and let it drop down, once I start running it back to the high range. 

    One time it was stuck in the top of my Zone 5 for almost an hour, which is of course impossible. Not only that, after that run it auto-adjusted my max HR based on the invalid measurements. Then it auto-adjusted my HR zones, even though I had LTHR based zones that shouldn't depend on the max HR. I was so angry that it messed up my settings!

    What I've learned is that there is a sort of predictive algorithm where the watch learns your level of effort and then it sticks to that range assuming that you continue with the same effort. 

    One time I ran uphill hard for an hour. Then when I was running downhill, even though I ran super relaxed and my HR must have been in Zone 2, the watch got stuck in mid Zone 5 and refused to go down for at least 30 minutes.

    Another time I had a similar run but I went uphill with a very easy effort never raising my HR above zone 3. That time when I went downhill the HR was in a correct range where I expected it to be.