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Oct 2018
4:56pm, 9 Oct 2018
1,083 posts
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Daz Love
I often see people on strava and you can normally tell if its a Optical they have on e.g. one week they run 5 miles at 8mm and there max is 140, next week they run a sub 18 5k and the max is 138!!!
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Oct 2018
4:58pm, 9 Oct 2018
9,885 posts
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Badger
Yup, a while back I did a parkrun and forgot my chest strap; the time would have been a PB 6 months previously, but apparently my maximum HR by optical was 158 (more like 198 in real life for a run like that).
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Oct 2018
5:19pm, 9 Oct 2018
283 posts
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Sjjh
I’m dubious about the optical readings I get on my 235 at the best of times but got used to the readings as they do improve as my fitness improves.
However when I run with the buggy it has some particularly odd readings. Saturday there was a flat out effort and average 104, max 122.
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Oct 2018
9:13pm, 9 Oct 2018
1,142 posts
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Brunski
So to sum up the last couple of pages sometimes it looks about right (but many of you aren't sure), other times it may as well be a random number generator.
Why I ditched mine.
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Oct 2018
9:16pm, 9 Oct 2018
13,509 posts
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Bazoaxe
This isnt helpful when I am considering an optical HRM as part of my next garmin purchase !
Currently thinking though like others, optical for measuring non active time would be good, but HRM for the running
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Oct 2018
9:18pm, 9 Oct 2018
6,112 posts
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chunkywizard
Optical works for me, on intervals as well. The Garmin elevate v2 (935) is better than the v1 (235). But it’s very dependent on the person.
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Oct 2018
9:20pm, 9 Oct 2018
19,989 posts
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fetcheveryone
Bazo - see if you can borrow one to test. I'm another person they work fine on, by and large - whereas chest straps chafe.
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Oct 2018
9:24pm, 9 Oct 2018
1,082 posts
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DavidFenlandRunner
Baz, for up to 160 bpm wrist based optical work ok (for me), however above 160 bpm it seems to increase the real number. Just the other week during a not flat out parkrun it recorded 184 bpm. I'm sure if I had worn a chest strap the reading would have been ~10 beats less.
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Oct 2018
9:29pm, 9 Oct 2018
13,510 posts
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Bazoaxe
I am broadly fine with chest straps as long as they are the old style ones and not the new soft strap ones which I found to be totally unreliable. I have had to do a bit of hand stitching to provide extra tightness on one side and will need to do the same on the other side soon !
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Oct 2018
11:25pm, 9 Oct 2018
17,899 posts
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flanker
Fenners - was it picking up your cadence rather than your heartbeat? It's quite a common problem.
Just to muddy the waters further, I get far better result from the latest Garmin Run HRM (the red one) than any of the old straps. It did chafe a bit, but some zinc oxide tape along the lower edge pretty much fixed it.
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Daniels Running Formula. The Definitive Wire.
Jul 2023