Stress levels computed by the watch, as exposed to Garmin Health SDK applications.
timestampDateTimeMoment 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.
Length of the interval covered by each value of the arrays in the message, in seconds.
Stress level for each interval, from 0 to 100. Negative values flag off-wrist periods, excess motion, not enough data or recovery from exercise.
mesgNumStringGlobal message number identifying the kind of message. Decoders use it to know which profile to apply to the data.