What this measures
The lowest sustained heart rate your device recorded while you were asleep, in beats per minute. It is an overnight figure, not a reading taken while you are up and about.
How your device works it out
Your device samples your pulse through the night with an optical sensor and reports the lowest stretch it can sustain a reading over. Providers choose different stretches, so the same night can come out a beat or two apart on two devices.
What generally moves it
Sleep, alcohol, caffeine late in the day, room temperature, exercise in the evening, altitude, and how tightly the device sat on your wrist or finger.
Why Thriverence shows it
It is a steady input, so it is read against your own usual range and shown as weeks rather than as one night. Readiness weighs it alongside heart-rate variability and sleep.
What it is not
This is not a blood-pressure reading and it does not diagnose anything. A number outside your usual range is not a finding about your body, and nothing here should be used to decide anything about a medical condition. The resources below are always available if you want to talk to a person.