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Nov 2017
6:08pm, 13 Nov 2017
33,794 posts
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Hills of Death (HOD)
I'm having problems with my 735xt it was giving 102% readings Tuesday then low reading since. Haven't had it that long but seemed ok before maybe needs update.
Had 225 before that was always fine
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Nov 2017
6:28pm, 13 Nov 2017
31,724 posts
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GlennR
Try tightening the strap.
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Nov 2017
8:58pm, 13 Nov 2017
5,090 posts
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chunkywizard
Could try a hard reset as well (press and hold power button). Also note, as it gets colder you might find Optical heart rate isn’t as acurate until you are warmed up a bit.
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Nov 2017
12:54pm, 14 Nov 2017
31,875 posts
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Nellers
Back to HR spikes early in runs: I saw comment that it was probably picking up cadence rather than HR until the contacts get wet. This morning it was a bit chilly. My HR readings peaked at 251! I don't think my feet could move that fast.
It settled down once I'd started sweating as always.
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Nov 2017
3:49pm, 14 Nov 2017
843 posts
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J2R
Nellers, maybe it was picking up your shivering cadence? 
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Nov 2017
6:45pm, 14 Nov 2017
31,878 posts
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Nellers
Could be.
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Nov 2017
6:49pm, 14 Nov 2017
680 posts
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puzzler
CW, I had a question for you as a Garmin guru. I’ve had a FR 235 pretty much since they released the first ones. Early days I got a bit of cadence lock but firmware updates seemed to fix that. Over the last week or so I have had problems on two separate runs. Once where the HR was very odd throughout ( I posted the screenshot here last week) and then again today when it was erratically jumping up and down between what I thought my HR should be and somewhere near my cadence. Any tips for curing it?
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Nov 2017
10:42pm, 14 Nov 2017
5,095 posts
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chunkywizard
puzzler, OHR is hard to pin down. The best thing to do is try it tighter (almost too tight) and slightly further up the arm. It also works worse in cold weather so you might be seeing effect soon of that. There's no golden bullet I'm afraid. Garmin are improving the technology as V2 of the sensor is in newer watches (like the 935) but it still has its moments and works far better for some than others.
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Nov 2017
7:50am, 15 Nov 2017
681 posts
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puzzler
Cheers CW, tried a hard reset and it was milder this morning with no problems. I’ll see how it goes
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Nov 2017
10:31am, 17 Nov 2017
14,030 posts
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Fenners
Anybody else get weird readings from a wrist based HRM when it is cold?
Yesterday the wrist based HRM behaved perfectly, it was mild.
Today, really cold, thick white frost on the grass, after three/four miles the HRM readings went mad. At a slow pace it was suggesting 150 bpm. However towards the end of the run (when the ambient temperature had increased) the readings appeared more normal.
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