Fidelity of delivery of a physical activity intervention:Predictors and consequences

Hardeman, Wendy ORCID:, Michie, Susan, Fanshawe, Tom, Prevost, A. Toby, McLoughlin, Katharine and Kinmonth, Ann Louise (2008) Fidelity of delivery of a physical activity intervention:Predictors and consequences. Psychology and Health, 23 (1). pp. 11-24. ISSN 0887-0446

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Assessing fidelity of behavioural interventions is important, but demanding and rarely done. This study assessed adherence to behaviour change techniques used in an intervention to increase physical activity among sedentary adults (ProActive; N = 365). Transcripts of 108 sessions with a sub-sample of 27 participants were assessed. An independent assessor coded adherence of four 'facilitators' who delivered the intervention to 208 protocol-specified facilitator behaviours (e.g. 'elicit perceived advantages of becoming more active') in four key sessions. Four raters classified the 208 behaviours under 14 techniques (e.g., goal setting, use of rewards) to enable calculation of adherence to techniques. Observed adherence to techniques across participants was modest (median 44%, IQR 35-62%), and lower than that reported by facilitators. Adherence differed between facilitators (range: 26-63%) and decreased across the four sessions (mean drop 9% per session, 95% confidence interval 7-11%). In this small sample facilitator adherence was unrelated to (change in) participants' physical activity or its cognitive predictors: Attitudes, subjective norm, perceived behavioural control and intention. Future research should investigate causal pathways between fidelity indicators and outcomes in larger samples and develop and test less intensive measures of fidelity.

Item Type: Article
Uncontrolled Keywords: behaviour change techniques,fidelity,intervention studies,physical activity
Faculty \ School: Faculty of Medicine and Health Sciences > School of Health Sciences
UEA Research Groups: Faculty of Medicine and Health Sciences > Research Groups > Health Promotion
Faculty of Medicine and Health Sciences > Research Centres > Lifespan Health
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Depositing User: Pure Connector
Date Deposited: 19 Nov 2015 08:20
Last Modified: 19 Oct 2023 01:31
DOI: 10.1080/08870440701615948

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