The user’s activity level when the heart rate sample was measured.
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NSString *const HKMetadataKeyHeartRateMotionContext;
This key takes an NSNumber containing an HKHeartRateMotionContext as its value.
Values that indicate the user’s level of activity when the heart rate sample was measured.
The location where a particular body temperature reading was taken.
The location where a particular heart rate reading was taken.
The method used to calculate the user’s VO2 max rate.
A quantity sample type that measures the user’s heart rate.