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Oct 2018
1:23pm, 9 Oct 2018
2,730 posts
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K5 Gus
Only use optical to see HR during day/night when not exercising, always use a strap for running.
Case in point - Saturday past, doing a 6 mile fell race, didn't have strap on correctly and could feel it starting to slip down, and with about 1.5 miles to go it was around my waist, so OHR kicked in at that point. HR immediately jumped about 15-20 bpm on what was the easiest part of the run, to over my maxHR.
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Oct 2018
1:54pm, 9 Oct 2018
65,083 posts
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Gobi
Brunski- when wrong it is horrific bad when close i can live with the data
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Oct 2018
2:09pm, 9 Oct 2018
1,141 posts
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Brunski
Yeah agree Gobi, if I went back to optical now I'd know when it was wrong but that wouldn't make it any less frustrating.
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Oct 2018
2:30pm, 9 Oct 2018
5,786 posts
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larkim
Broadly the point seems to be that, putting static on t-shirts to one side, chest straps work in terms of data reliably for everyone, whereas there appear to be some people for whom the optical ones don't work well enough in all conditions. And it seems to me that it must be down to the strap / wrist placement rather than the actual tech of having a red / green light shine through your wrist as that tech is employed even in hospitals.
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Oct 2018
2:37pm, 9 Oct 2018
65,084 posts
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Gobi
It is sad when the success of a device relies on you knowing if the data is bad Brunski.
Larks - mibe is quite good for lifestyle tracking but even then I get some great number sometimes 
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Oct 2018
2:45pm, 9 Oct 2018
5,790 posts
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larkim
It's odd as some reviews (e.g. DC Rainmaker) definitely give the impression that optical is fine.
My wife has had some odd readings when racing (particularly in the cold) with hers - dramtic drop in HR 10 miles into a HM for example - so I'd be the last to say they were infallible!
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Oct 2018
3:43pm, 9 Oct 2018
17,898 posts
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flanker
DCR does also acknowledge though that it can be affected by skin colour, body hair, tightness, etc.
My results mirror the above - it's good for light exercise but becomes less reliable as the intensity increases. I'm a right sweaty bugger though, and wonder if that is part of the problem.
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Oct 2018
3:48pm, 9 Oct 2018
38,355 posts
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GlennR
My 935 seems to have got worse recently, to the extent that I can see it is reading wrong when sitting still - like most of us my resting HR is low by the standards of a normal person, but on the watch it seems to tick over around the 75bpm mark. I used my strap for this morning's run and that was a lot more convincing.
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Oct 2018
4:30pm, 9 Oct 2018
1,400 posts
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J2R
larkim, isn't it possible that DC Rainmaker is just someone for whom optical works, whereas it doesn't so well on many people? His expertise is unquestionable, but he can only really thoroughly test on himself and he may just be lucky in this respect.
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Oct 2018
4:33pm, 9 Oct 2018
5,793 posts
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larkim
Agree with that J2R - and I think that's the issue with optical. It works well for some, and not for others.
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