Report copyright - FeasibilityE˚cacyAHearRate Variability Beedback ......78 Applied Psychophysiology and Biofeedback (2020) 45:75–86 1 3 Participantsself-administeredHRV-BviatheMeru HealthappusingaHeartMath®Bluetoothphotoplethys-mography(PPG)sensor,whichwassenttoeachparticipant
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