The Transtheoretical model’s processes of change in the heart of a physical activity intervention: A series of n-of-1

The objectives were a) to test whether a Processes of Change (POC)-personalized Transtheoretical model (TTM)-based intervention could increase physical activity (PA) among inactive adults, and b) examine the increased level TTM theoretical constructs. following hypotheses formulated: 1) PA levels will be significantly higher during after in comparison baseline measures; 2) targeted POCs intervention; 3) non stay stable, 4) self-efficacy decisional balance intervention. A series N-of-1 with (1 2-week)-B(10-week)-A'(2-week) design conducted 12 adults. Behavioral counselors used behavior change techniques target constructs supervise PA. Interventions individualized based on 5 lowest pre-intervention level. Device-based subjective along measures collected weekly online. data analyzed piecewise linear models. visual analysis was run Device, self-reported available for five, seven five participants, respectively. significant six participants found phase B A2. device-measured observed two study. substantial POC from all observed. This study provides first evidence behavioral psychological effects POC-personalized TTM-based