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Heart rate variability is the time between each of a person's heart beats.
While there There are some devices on the market that capture this data, and it is not a supported metric reported in the Validic Inform API for those sources that report it. Today, Fitbit and Emfit report this information.
Some sources, such as Garmin and Fitbit, may have devices that capture this data, but those vendors have not yet added the metric to their API.