SelfSync

Beat intervals message

Beat intervals messages store the time between consecutive heartbeats, measured by the optical sensor or a chest strap. They are the raw material for heart rate variability (HRV).

FIT name
beat_intervals
Global message number
290
JavaScript SDK key
beatIntervalsMesgs
Fields
4

Fields

  • timestampDateTime

    Moment the message refers to, in UTC. FIT stores it as seconds since the FIT epoch (December 31, 1989, 00:00:00 UTC); decoders usually expose it as a regular date.

  • timestampMsUint16ms

    Millisecond part of the timestamp.

  • timeUint16[]ms

    Times between consecutive beats.

  • mesgNumString

    Global message number identifying the kind of message. Decoders use it to know which profile to apply to the data.

Other health and monitoring messages

See all the FIT messages