The associations between the response efficacy and objective and subjective change in physical activity and diet in the Information and Risk Modification trial.
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Wou, C., Silarova, B., Griffin, S., & Usher-Smith, J. (2018). The associations between the response efficacy and objective and subjective change in physical activity and diet in the Information and Risk Modification trial.. Public health, 165 26-33. https://doi.org/10.1016/j.puhe.2018.09.006
Objectives Many health promotion campaigns and interventions focusing on improving health-related behaviours have been based on targeting response-efficacy. This is based on the assumption that response efficacy is an important modifiable determinant of behaviour change. This study aimed to quantify the association between response efficacy and objective and subjective measures of physical activity and diet. Study design Prospective cohort analysis of data from a randomised controlled trial Methods 953 participants were assessed for response efficacy at baseline and 12 weeks following randomisation to interventions to increase physical activity and improve diet. Subjective measures were collected via a self-report questionnaire which included two questions used to derive the Cambridge Index of physical activity and questions about daily or weekly fruit and vegetable, whole grain, meat and fish intake, based on dietary guidelines to lower cardiovascular risk. Objective measures were quantified using accelerometer and plasma carotenoids. Results The mean change in response efficacy for physical activity was +0.5 (SD 2.0) and for diet was +0.5 (SD 2.1). There were no clinically or statistically significant associations between baseline or change in response efficacy and objective and subjective measures of physical activity or objective measures of diet. There was a small statistically significant association between baseline response efficacy and change in self-reported whole grain consumption, but this is unlikely to be clinically significant. Conclusions Response efficacy is not a fundamental determinant of diet and physical activity and should not be the main focus of interventions targeting these behaviours.
Humans, Cardiovascular Diseases, Exercise, Diet, Prospective Studies, Health Knowledge, Attitudes, Practice, Health Behavior, Adult, Aged, Aged, 80 and over, Middle Aged, Health Promotion, Female, Male, Self Report
European Commission (279233)
Department of Health (via National Institute for Health Research (NIHR)) (NF-SI-0515-10119)
British Heart Foundation (RG/13/13/30194)
Embargo Lift Date
External DOI: https://doi.org/10.1016/j.puhe.2018.09.006
This record's URL: https://www.repository.cam.ac.uk/handle/1810/286212
Attribution 4.0 International
Licence URL: https://creativecommons.org/licenses/by/4.0/