Objective: To assess the FitBit FlexTM as a low-intensity, low cost physical activity (PA) intervention for pediatric cancer survivors (PSCs). Additionally, we aimed to assess the impact of social support (SS) for PA on moderate to vigorous physical activity (MVPA), and the feasibility/acceptability of survivors wearing a FitBit FlexTM. It was hypothesized that wearing a FitBit FlexTM and increased SS would increase rates of MVPA/step count and that survivors and their families would report high feasibility/acceptability of FitBit FlexTM use. Methods: Utilizing an N-of-1 design, participants and one of their parents were randomized by day for 30 days to wear or not wear the FitBit FlexTM. SS for PA was measured using the Social Support for Exercise Survey. Acceptability and feasibility were assessed using a Feedback Questionnaire and examining protocol compliance. Results: Twelve PCSs (Mage = 13.6 years; 33% male; 67% Caucasian) completed the study. Participants engaged in less MVPA than recommended. Additionally, the FitBit FlexTM intervention negatively impacted rates of MVPA and step counts. SS did not have an impact on rates of MVPA. Participants were adherent to wear time and study protocol. Acceptability and feasibility were high. Conclusions: Rates of PA are a concern among PCSs and interventions are needed to promote positive behavior change. Future research should aim to better understand the role that electronic devices and SS can play within this specific population to help promote increased PAPsycholog
