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A just-in-time adaptive intervention to enhance physical activity in the SMARTFAMILY2.0 trial

Fiedler, Janis ORCID iD icon 1; Seiferth, Caroline; Eckert, Tobias 1; Woll, Alexander ORCID iD icon 1; Wunsch, Kathrin 1
1 Institut für Sport und Sportwissenschaft (IfSS), Karlsruher Institut für Technologie (KIT)


Just-in-time adaptive interventions (JITAIs) are a promising technology-based approach for health behavior change. This examination aimed to evaluate whether a JITAI after a period of inactivity can enhance physical activity (PA) in the subsequent hour depending on whether the JITAI has been answered (“engaged” condition) compared to when the trigger was not answered (“not engaged” condition). Data of the 3-week intervention period of the SMARTFAMILY2.0 trial was used for analysis. A total of 80 participants (n = 47 adults, 23 female; n = 33 children, 15 female) with 907 JITAI triggers were included in this examination. A JITAI was sent when the participant has been inactive for at least 60 min as indicated by accelerometry. Two multilevel models were calculated for metabolic equivalents (MET) and step count with measurements (Level 1) nested in participants (Level 2) under consideration of the covariates weekday/weekend, time of the day, and adult/child. Results indicated significantly higher MET (β = 0.08, p = .014) and step (β = 0.08, p = .022) counts in the subsequent hour for the engaged condition compared to the not engaged condition within-persons (Level 1). ... mehr

Zugehörige Institution(en) am KIT Institut für Sport und Sportwissenschaft (IfSS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 2157-3913, 2157-3905
KITopen-ID: 1000153286
Erschienen in Sport, Exercise, and Performance Psychology
Verlag American Psychological Association
Band 12
Heft 1
Seiten 43–57
Nachgewiesen in Dimensions
Web of Science
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