The Association of Physical Activity, Heart rate and Sleep from an Activity Tracker with Weight loss during a 6-month Personalized Combined Lifestyle Intervention: a Retrospective Analysis

Personalizing lifestyle interventions by self-monitoring with wearable sensors can enhance adherence and improve intervention outcomes. It is unknown whether measures from a wearable device can detect lifestyle changes during an intervention. Therefore, the association between individual weight loss with continuous measures from a Fitbit was examined during a personalized SLIMMER combined lifestyle intervention.A retrospective analysis was performed to assess the association of various Fitbit (Charge 4) measures and self-monitoring behaviors on achieved weight loss during a personalized version of SLIMMER. In this study, 61 people with overweight or obesity were included and were followed one month before the start and six months during a personalized SLIMMER program. Personalization included ambulatory monitoring with an activity tracker and smart scale. Fitbit data was pre-processed to ensure sufficient day- and night- wear-time. Body weight was assessed at the study start and end. Physical activity (PA), heart rate, and sleep were selected from Fitbit output.