HKMetadataKeyHeartRateEventThreshold
A key that records the threshold of high or low heart rate events in beats per minute.
Declaration
let HKMetadataKeyHeartRateEventThreshold: StringDiscussion
The value for this key contains an HKQuantity object with count/time units, described in HKUnit. This metadata key is used by highHeartRateEvent and lowHeartRateEvent category samples.