4 ms·
Capturing HR once a minute is of really limited use. More than benchmarking against resting HR, the interesting thing is to look at heart rate variability, and
by saspect 12y ago
Capturing HR once a minute is of really limited use. More than benchmarking against resting HR, the interesting thing is to look at heart rate variability, and to do that you need to scan several times per second.
For that using purpose-built devices is just better.
I am thinking:
https://jawbone.com/store/buy/up3 https://jawbone.com/store/buy/up3
or
http://www.getqardio.com/qardiocore-wearable-ecg-ekg-monitor-iphone/ http://www.getqardio.com/qardiocore-wearable-ecg-ekg-monitor...
- jhwhite 12y agoI thought the Up3 only measured resting HR.
- matco11 12y agoYou are right. A few months ago Jawbone UP3 definitely had HRV listed in the heart health features. That's specifically why I was looking to buy it. I guess that's close to impossible with an optical sensor.
- andrewjshults 12y agoEven the standalone optical HRMs (e.g., Scosche RHYTHM+) aren't good enough to do HRV[1] even though their accuracy compares favorably with the chest strap models[2] [1] http://www.dcrainmaker.com/2014/05/scosche-antbluetooth-optical.html http://www.dcrainmaker.com/2014/05/scosche-antbluetooth-opti... about 10% down the page [2] http://www.dcrainmaker.com/2014/05/scosche-antbluetooth-optical.html#optical-hr-accuracy-geekfest http://www.dcrainmaker.com/2014/05/scosche-antbluetooth-opti...
- photonic29 12y agoPhotoplethsymographic heart rate requires a lot of algorithmic compensation for noise and motion artifact. There are some pretty sophisticated strategies available for beat interpolation, but individual R-R intervals are tremendously more difficult to recover accurately against real-world noise. HRV measurements are also very intolerant to error in R-R interval, and even less so to dropped beats. There are certainly conceivable solutions to these problems, but no major manufacturer of PPG based consumer heart rate devices allows access at a level low enough to get R-R time series or understand R-R interval confidence. OEM module manufacturers for pulse ox devices do allow direct serial access to the PPG waveform for those interested in hacking at it.
- brandonb 12y agoThis is really useful! Would you mind emailing me at brandon@cardiogr.am? I'd love to know more.
- photonic29 12y agoHey Brandon, I replied to you from an address containing 'dash'.