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Measuring change in trials of physical activity interventions: a comparison of self-report questionnaire and accelerometry within the PACE-UP trial

Limb, ES; Ahmad, S; Cook, DG; Kerry, SM; Ekelund, U; Whincup, PH; Victor, CR; Iliffe, S; Ussher, M; Fox-Rushby, J; et al. Limb, ES; Ahmad, S; Cook, DG; Kerry, SM; Ekelund, U; Whincup, PH; Victor, CR; Iliffe, S; Ussher, M; Fox-Rushby, J; Furness, C; Ibison, J; DeWilde, S; Harris, T (2019) Measuring change in trials of physical activity interventions: a comparison of self-report questionnaire and accelerometry within the PACE-UP trial. Int J Behav Nutr Phys Act, 16 (1). p. 10. ISSN 1479-5868 https://doi.org/10.1186/s12966-018-0762-5
SGUL Authors: Cook, Derek Gordon De Wilde, Stephen Harris, Teresa Jane Limb, Elizabeth Sarah Ussher, Michael Henry Whincup, Peter Hynes Watson, Cheryl Ann

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Abstract

Background Few trials have compared estimates of change in physical activity (PA) levels using self-reported and objective PA measures when evaluating trial outcomes. The PACE-UP trial offered the opportunity to assess this, using the self-administered International Physical Activity Questionnaire (IPAQ) and waist-worn accelerometry. Methods The PACE-UP trial (N = 1023) compared usual care (n = 338) with two pedometer-based walking interventions, by post (n = 339) or with nurse support (n = 346). Participants wore an accelerometer at baseline and 12 months and completed IPAQ for the same 7-day periods. Main outcomes were weekly minutes, all in ≥10 min bouts as per UK PA guidelines of: i) accelerometer moderate-to-vigorous PA (Acc-MVPA) ii) IPAQ moderate+vigorous PA (IPAQ-MVPA) and iii) IPAQ walking (IPAQ-Walk). For each outcome, 12 month values were regressed on baseline to estimate change. Results Analyses were restricted to 655 (64%) participants who provided data on all outcomes at baseline and 12 months. Both intervention groups significantly increased their accelerometry MVPA minutes/week compared with control: postal group 42 (95% CI 22, 61), nurse group 43 (95% CI 24, 63). IPAQ-Walk minutes/week also increased: postal 57 (95% CI 2, 112), nurse 43 (95% CI -11, 97) but IPAQ-MVPA minutes/week showed non-significant decreases: postal -11 (95% CI -65, 42), nurse -34 (95% CI -87, 19). Conclusions Our results demonstrate the necessity of using a questionnaire focussing on the activities being altered, as with IPAQ-Walk questions. Even then, the change in PA was estimated with far less precision than with accelerometry. Accelerometry is preferred to self-report measurement, minimising bias and improving precision when assessing effects of a walking intervention.

Item Type: Article
Additional Information: © The Author(s). 2019 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
Keywords: Accelerometry, GPPAQ, IPAQ, Intervention, MVPA, Primary care, Walking, 11 Medical And Health Sciences, 13 Education, Public Health
SGUL Research Institute / Research Centre: Academic Structure > Population Health Research Institute (INPH)
Journal or Publication Title: Int J Behav Nutr Phys Act
ISSN: 1479-5868
Language: eng
Dates:
DateEvent
22 January 2019Published
6 December 2018Accepted
Publisher License: Creative Commons: Attribution 4.0
Projects:
Project IDFunderFunder ID
HTA 10/32/02Health Technology Assessment programmehttp://dx.doi.org/10.13039/501100000664
PubMed ID: 30670036
Go to PubMed abstract
URI: http://openaccess.sgul.ac.uk/id/eprint/110451
Publisher's version: https://doi.org/10.1186/s12966-018-0762-5

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