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Feb 2016
9:47pm, 18 Feb 2016
31,839 posts
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Hills of Death (HOD)
I find the viiiva much more reliable than Garmin HRM
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Feb 2016
10:06pm, 18 Feb 2016
541 posts
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steve45
I've used York, Polar and Garmin over the last ten years and the Polar most often. I get identical readings from each..at least based on relationships to pace and average HRM over various distances. As for inaccuracies, how does anyone actually know if they are inaccurate other than for the occasional "way of the mark" high spikes? A good Life Insurance policy might be a good idea just in case it's the heart that is "inaccurate" (!) and not the HRM!
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Feb 2016
10:15pm, 18 Feb 2016
31,840 posts
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Hills of Death (HOD)
My Garmin was going from 130 ish on an easy run to 200 not a spike and doesn't happen with the Viii
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Feb 2016
11:40pm, 18 Feb 2016
16,297 posts
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flanker
Glenn - I've not noticed the cotton advise before, but then again it's very rare I read any manual!
My strap is the same as the 920 (the fancy run dynamics one) and I had all sorts of problems Nov - Jan with it reading about 180, peaking at 220 (if only...). It's only soaking it beforehand that lets me get reliable HR info.
I'm not surprised that the optical sensors give dodgy readings during exercise - they are primarily for lifestyle 24x7 monitoring. For the new Fenix 3 HR Garmin currently aren't prepared to commit to the optical one being suitable for exercise. The say the jury is still out whether it is accurate enough during rigorous exercise.
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Feb 2016
8:05am, 19 Feb 2016
3,107 posts
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postieboy
Makes you wonder why Tom Tom and Garmin release this technology knowing it's flawed
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Feb 2016
9:11am, 19 Feb 2016
16,299 posts
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flanker
it's not flawed - it just people are not using the correct tool for job. All the evidence is that for a 24x7 HR lifestyle tracking it works well.
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Feb 2016
9:53am, 19 Feb 2016
6,914 posts
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Badger
There's a ton of customer pressure for it, too.
Optical can work OK for running if the sensor is far enough up your arm to be firmly on a chunk of muscle with plenty of blood flow (my Scosche Rhythm+ agrees really well with a chest strap on all but the coldest of days). Trouble is, back of a watch right over the wrist doesn't really fit that, and unless you are using an elastic strap, it's not very firm either; so cadence tends to overwhelm the true blood signals when you're running.
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Feb 2016
11:23am, 19 Feb 2016
3,109 posts
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postieboy
Just got back from a 13 mile run and it worked a lot better today after yesterday's soft reset. It did spike near the end of the run but a little nudge to adjust the position got it back to normal. It's obvious an optical HRM requires perfect positioning on the wrist for it to work well.
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Feb 2016
11:34am, 19 Feb 2016
3,110 posts
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postieboy
Optical HRM's are far from perfect and still needs development. You can't have something with zero margin for error, especially when you're constantly on the move. 1 mm can make all the difference to the readings and you don't want to be looking at the watch all of the time.
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Feb 2016
12:16pm, 19 Feb 2016
637 posts
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Fragile Do Not Bend
Is it only men having trouble with HRM chest straps? I've not had a problem so far with mine, I wonder if it's because I wear mine tucked up underneath my bra strap.
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Daniels Running Formula. The Definitive Wire.
Jul 2023