So far, data from a second and third gen Oura ring should be comparable (if not the same).
In this post, let’s check out the readiness score and some data that goes into it.
Going by the order of tabs in the Oura app, the readiness score is the place to start.
An aside you might notice, and that will play a role all the time: Yes, there are gaps.
These gaps are the result of the Gen2 ring being connected to a phone that I don’t usually use, so that low battery warnings didn’t come in time or came, but I didn’t notice them.
Consequently, the Gen2 ring had more nights when it couldn’t record all the data because it didn’t have sufficient battery left for that.
Interestingly, the (1.5-years-old) Gen2 ring still lasts for about a week, but it’s not entirely consistent in that.
Readiness Scores Compared
Readiness scores show that the Gen2 probably needed time to get a baseline, indeed. But even then, at the beginning of my comparison data gathering, it shows similar trends to the Gen3 ring.
This only got better.
Scores weren’t the same, but close and (usually) trending in similar directions.
Resting Heart Rate
The lowest heart rate recorded (during rest, i.e. sleep) is independent of any baseline data, so should be the same.
As you can see, there were times when it is not the same, usually with the Gen 2 ring reporting a lower value.
That wasn’t always the case, however.
Even so, the worst difference is the 4 bpm difference on day 7. Usually, differences were zero to 1 bpm.
Average HR could be a different issue, for better or worse, because of the averaging involved–and in the Oura ring comparison, the Gen2 and Gen3 rings agreed very closely on that.
Another factor going into the readiness score is the (average) heart rate variability.
Seeing the difference in values recorded between Gen2 and Gen3 rings, I do wonder if the Gen3 ring’s switch to my ring finger (and a looser fit) could have had some influence.
The values, as can be easily seen, follow the same trends, predominantly, but they look like they have an offset; the Gen3 ring always has me at a lower HRV than the Gen2.
How many breaths you take per minute is indicative of your health or recovery status; a higher rate could mean illness or recovery from strenuous training.
Here we have different data from the two generations of rings again.
It is rather divergent in trends, too–but looking closer, the values are once again rather close by each other.
I don’t have the necessary data for that, but I’d assume that the margin of error here is close to 1 breath per minute. And that would make those data points pretty much all the same; a difference of 1 breath per minute (and that calculated from heart rate) would probably not be very noticeable.
The difference in body temperature from night to night – and that is what the Oura ring shows; it is not a thermometer giving absolute values but only a tool to measure the differences/trends – has proven one of the most interesting features.
When it comes to COVID, it seems very good at detecting infection; it also caught my bodily reaction to the COVID vaccine very well. With the spO2 measurement in the Gen3 ring, Oura might become even better at recognizing a COVID infection and its aftermath.
For women, this analysis is also the foundation for period prediction.
The data here?
Well, I’d want more and consistent data. There is a good chance that the gaps (from the Gen2 not having had enough charge during some nights) results in most of the disagreements.
Even that is not entirely certain, however.