User level: Level 1 (8 points)Picked up an Apple Watch Series 12 today; worn all day but the health app doesn’t have any more HRV data logged than usual. Just a couple of entries over the day, hours apart. Is there some sort of opt in option needed to enable this data?
Posted on Sep 18, 2026 7:32 PM
User level: Level 4 (1,080 points)Sep 26, 2026 11:02 AM in response to TheGreatDave
There’s no separate opt-in needed for HRV. On the Series 12, Apple says HRV is measured automatically, but the number of readings can vary because HRV is sampled when you’re relatively still.
So a few readings throughout the day can be normal. Also make sure Heart Rate is enabled under Watch app → Privacy → Heart Rate, and wear the Watch snugly with good skin contact.
If you’re looking at the new daytime Vitals HRV, give it some time to build up data; Apple says the Series 12 collects daytime HRV automatically.
More info:Apple Support – Monitor your heart rate with Apple Watch
User level: Level 2 (213 points)Sep 28, 2026 1:04 PM in response to TheGreatDave
Same. Day 10, no HRV data, but other vitals metrics are published. Watch 12, 18 Pro, v. 27.0.1 on both devices.
Originally posted at discussions.apple.com/thread/256360172