Abstract
Wearable activity trackers (WATs) can facilitate engagement in physical activity. Yet, there may be an additional psychological impact, which can influence their effectiveness. Therefore, the aim of this systematic review was to assess the impact of wrist-based WATs on physical activity and subsequent psychological wellbeing in healthy adults. The review was carried out using PRISMA guidelines and registered on the Open Science Framework (OSF). An initial search was conducted in December 2022 with a follow-up in October 2023. Databases included PsychInfo, PsycArticles, ScienceDirect, Web of Science and SPORTDiscus. Nine studies were selected for inclusion and reviewed. Most studies comprised white adults with an average age of 21.5 to 49 years. Participants were employed or students with a mostly normal BMI. Changes in self-efficacy for exercise, depressive symptoms, mental health and general wellbeing, quality of life and burnout were evaluated. Half the studies reported a WAT-related increase in physical activity engagement. Four studies assessed self-efficacy for exercise, with half observing an improvement post-intervention. Three studies assessed mental health and depressive symptoms with one observing improvement and two observing no change. The remaining studies included measures of burnout and quality of life, where only burnout scores improved 1-month post-intervention. Although the quality of the studies reviewed was acceptable, only 4 included a suitable control/comparison group. Further, the measurement of psychological wellbeing varied considerably. In sum, the results indicate that the effect of WATs on physical activity and subsequent psychological wellbeing is understudied. Further research is required to fully elucidate these relationships.