This discussion has been locked.

You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Heartrate doubling (e.g. actual: 40bpm, measured: 80bpm)

I just started using a new 935 and I have noticed that the oHR (not during activity) is not that significantly better than my 235 or 735xt.

More specifically, my actual HR when sitting is usually around 35-45 bpm and when I walk lightly around 60bpm. Unfortunately, when I switch over to the HR Widget, I notice that the 935 measures pretty much double the HR at 70-90 sitting and 120 in light walking. As a side note, during actual activities I am using an HRM-Run so I don't have anything weird to report there.

a) Has anyone else noticed that HR-doubling (which is not caused by cadence lock since it's not during activity)
b) Is there a way to "bias" the HR monitor by indicating that my natural HR state is much lower than other people?

PS
My guess is that Garmin's algorithm does some sort of Fourier analysis on the periodicity of the HR and somehow it gets "stuck" on the 1st harmonic rather than picking out the fundamental.

0 timeasterday over 7 years ago

During a gym workout yesterday my 935 was actually giving me exactly half my heart rate. This was during my warmup on a stairmill. Later it suddenly jumped up to the proper number.

0 erik.d over 7 years ago

I'm noticing this as well, usually when my HR is in the 50's or lower.

0 kalamarios over 7 years ago

I'm noticing this as well, usually when my HR is in the 50's or lower.

Let's hope that the V800 replacement is going to be solid. Garmin seems to have too much on their hands with CIQ and FW development in general as FW quality control is going south.

0 5495897 over 2 years ago

Yes. I get this double effect with my FR55. No solution yet.

0 IanHayman over 2 years ago

I have a very similar issue - but the other way round on my 935. The widget seems pretty accurate when I'm resting (HR-40 ish) but when I walk/run/cycle it reads super-high initially (about 50% over vs. what I get when I stop and measure my pulse manually). Sometimes it settles down to the correct rate, sometimes it doesn't. If I stop (completely still) the rate goes to the correct value and then goes sky-high again after re-starting.

With a chest strap I get similar symptoms but not as often and when it does read high, it settles down after 10 mins or so. I've tried different chest straps with the same results. Wetting the chest strap a lot helps but who wants to go for a walk with a wet strap round their chest?

I've contacted Garmin about this, they say that I need to do a warm-up for 10 mins before starting my activity, but this makes little difference to the incorrect HR readings.