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

Lapointe, Josyanne; Comtois, Alain-Steve; Romain, Ahmed-Jérôme et Bernard, Paquito (2023). « The Transtheoretical model's processes of change in the heart of a physical activity intervention: A series of n-of-1 ». Psychology of Sport and Exercise, p. 102430.

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

Type: Article de revue scientifique
Mots-clés ou Sujets: Accelerometry, Behavior change techniques, Processes of change, Self-efficacy, Single case experimental study
Unité d'appartenance: Faculté des sciences > Département des sciences de l'activité physique
Déposé par: Paquito Bernard
Date de dépôt: 23 mars 2023 07:49
Dernière modification: 23 mars 2023 07:49
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