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No it doesn't. It uses HRV measurement
"The Firstbeat method detects periods of stress, recovery, and physical activity from the HRV measurement."
"For the most reliable recovery analysis, sleep time is suggested"
"Quick recovery tests can be applied during awake time in cases when easily performable checks for recovery status are needed. The tests can be conducted routinely each morning,
before a training session or when preparing to a match. ""Recovery assessments should always be started before hard training periods. "
hippy
I think it just looks at the session you've just done.
I do brick sessions. Often a second session results in the recovery time being less. Simply because that session had less volume/intensity. It isnt adding them up.