3 ms·
REM is characterized by lack of movement and variable respiration rate. So I would imagine the signal is erratic oxygen saturation. You'll get better results
by coredog64 9y ago
REM is characterized by lack of movement and variable respiration rate. So I would imagine the signal is erratic oxygen saturation. You'll get better results if you can correlate that with an accelerometer.
Disclosure: I worked on a sleep tracking device that is a competitor to Beddit.
- dchuk 9y agoCan you shed light on whether there are a common set of algorithms that sleep trackers use or if they are generally all proprietary?
- fleetingmoments 9y agoThere are some common algorithms for sleep/wake classification from accelerometer input, but sleep stages algorithms are all proprietary as far as I know.
- antisthenes 9y agoWhich is another way of saying "no way to verify if they're bullshit or not".
- fleetingmoments 9y agoNot true, anyone could take them to a sleep lab and compare to Polysomnograph-based sleep scoring. I'd love to see a large, independent study on this for a couple of the leading trackers.
- deleted 9y ago[deleted]
- fleetingmoments 9y agoNone of the popular wrist-based trackers have an oximeter. You need red and infrared light for that, and it is really tricky to get accurate measurements at the wrist in any case. You don't measure respiration rate with oximetry in any case, oxygen saturation does not change that fast. The more advanced solutions are mostly based on Heart Rate Variability which shows some correlation to sleep stages. Source: also worked on this.