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Aug 2018
6:55pm, 30 Aug 2018
5,459 posts
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larkim
PArt of it of course is a FitBit marketing activity, hence the obsession with reporting HR and fitness as one in the same. You’d hope they share the info with some “proper” scientists who can look at it, come up with some theories about the trends they are seeing, and then do the research to prove or disprove the theories.
But definitely interesting.
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Aug 2018
10:50pm, 30 Aug 2018
381 posts
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SSLHP (Shoes smell like horse piss)
the only problem with it thought is that Fitbit in particular is renowned for not recording accurate heart rates
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Aug 2018
11:14pm, 30 Aug 2018
6,312 posts
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The_Saint
About the premise that lower resting heart rate is associated with better outcomes, I googled "Scholar low resting heart rate death risk" and this does seem to be pretty well established. What I have not seen is a statement that this continues to improve the lower the rate (ignoring the pedantic zero not being that good that clever dicks always think they invented).
As for Fitbits and accuracy, there is only one authoritative source in these matters - DC Rainmaker - I only scanned quickly but I didn't spot anything that terrible in his reviews.
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Aug 2018
10:08am, 31 Aug 2018
29,143 posts
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HappyG(rrr)
DCR also has no problem with Garmin optical HR but lots of anecdotes from Fetchies in this hallowed place that it's not as reliable as chest strap. For some people. Could be as mundane as wrist size / shape and hence watch fit on wrist.
Isn't there something important about Heart Rate Variability and its importance as a measure of heart health and fitness? Fitbit can't do HRV, I don't think?
 G
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Aug 2018
10:21am, 31 Aug 2018
1,345 posts
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J2R
I would definitely trust HRV more, from what I've read on the subject. And no, I don't think Fitbit does that.
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Aug 2018
10:54am, 31 Aug 2018
37,692 posts
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GlennR
I have no issues with the optical HR on my Garmin FR935, but it will only do HRV when I use the chest strap.
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Aug 2018
11:35am, 31 Aug 2018
6,313 posts
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The_Saint
I trust DCR way more than anecdotes from people who bless them do not have his experience and knowledge
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Aug 2018
11:51am, 31 Aug 2018
6,314 posts
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The_Saint
With HRV, I got quite interested in the subject and tried out various pieces of software. What made me less interested was taking part in a PhD student's study at Cardiff Met which was looking at differences in the parasympathetic and sympathetic nervous systems in trained endurance runners compared to sedentary people. At some point I made what I thought was an intelligent suggestion at comparing HRV only to be told that HRV is very interesting but nobody can tell us what it proves other than the assertion that high is good and low is bad.
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Aug 2018
11:58am, 31 Aug 2018
19,761 posts
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fetcheveryone
If you get the positioning and fit right, I think optical HR is pretty good.
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Aug 2018
12:16pm, 31 Aug 2018
5,466 posts
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larkim
Yep, that sounds right. There's nothing flawed in the optical sensor approach, but if the sensor isn't in the right place on your wrist the data is just as poor as sticking a GPS watch at the bottom of your rucksack and expecting it to track properly.
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