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Title: Measuring change in trials of physical activity interventions: a comparison of self-report questionnaire and accelerometry within the PACE-UP trial
Authors: 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
Keywords: Walking;Intervention;Primary care;MVPA;Accelerometry;IPAQ;GPPAQ
Issue Date: 22-Jan-2019
Publisher: BMC
Citation: The international journal of behavioral nutrition and physical activity, 2019, 16 (10), pp. 1 - 11
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 12months and completed IPAQ for the same 7-day periods. Main outcomes were weekly minutes, all in ≥10min 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, 12month 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.
Appears in Collections:Dept of Health Sciences Research Papers

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