Blood oxygen

[Piiipmatz]

My Race 2 consistently provides a blood oxygen level reading every night. However, I am unable to measure my blood oxygen level manually during the day. Out of 100 attempts, not a single one was successful. Why can the Race 2 measure blood oxygen levels at night but not during the day?

[Elipsus]

@Piiipmatz For blood oxygen measurement (the way its carried by smartwatches), the watch needs a lot of conditions :

• low ambient light
• absolutely no movements
• resting state

which all happens pretty regularly at night, and is pretty hard to get by day.
Also, the watch seems to try to measure it multiple times during the night, and it gets 8ish hours to do so, so it can try many times too.

The reflective Blood oxygen measurement is really shitty compared to transflective measurement (the one in the hospitals where the hook it to your finger), and smartwatch measurement are really not that great, as shown by the pretty bad accuracy and repeatability

[cheetah694]

Just curious. How can this metric help in structuring your workouts?

[Elipsus]

@cheetah694 For me it doesn’t structure my workouts, but I noticed it was a good indicator for altitude adaptation, and it helped “temper” my speed expectation on some trails

[Piotr Grygiel]

@Piiipmatz I have the same problem, but I believe that the measurements at night are incorrect.

[Dimitrios Kanellopoulos]

we have a known issue about blood oxygen reporting very low values. If you have this please report the version you are on

[Piotr Grygiel]

@Dimitrios-Kanellopoulos 2.46.14