Is measurement error altered by participation in a physical activity intervention?

Winkler, Elisabeth, Waters, Lauren, Eakin, Elizabeth, Fjeldsoe, Brianna, Owen, Neville and Reeves, Marina (2013) Is measurement error altered by participation in a physical activity intervention?. Medicine and Science in Sports and Exercise, 45 5: 1004-1011. doi:10.1249/MSS.0b013e31827ccf7d

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Author Winkler, Elisabeth
Waters, Lauren
Eakin, Elizabeth
Fjeldsoe, Brianna
Owen, Neville
Reeves, Marina
Title Is measurement error altered by participation in a physical activity intervention?
Journal name Medicine and Science in Sports and Exercise   Check publisher's open access policy
ISSN 0195-9131
Publication date 2013-05
Year available 2013
Sub-type Article (original research)
DOI 10.1249/MSS.0b013e31827ccf7d
Open Access Status File (Author Post-print)
Volume 45
Issue 5
Start page 1004
End page 1011
Total pages 8
Place of publication Philadelphia, PA, United States
Publisher Lippincott Williams & Wilkins
Collection year 2014
Language eng
Formatted abstract
Purpose: There is no “gold standard” measure for moderate to vigorous physical activity (MVPA); some error is inherent to self-report and device-based measures. Few studies have examined agreement between self-report and device-based measures in the intervention trial context or whether the difference between measures is influenced by intervention participation.

Methods: MVPA was measured at baseline and after 6 months by Active Australia Survey (AAS) and by the GT1M accelerometer (>=1952 counts per minute) in the intervention (n = 135) and usual care control (n = 141) participants of a randomized trial targeting weight loss by MVPA increases and energy intake reductions in adults with type 2 diabetes. Agreement (for each group at each assessment) was examined using the Bland–Altman approach and regression-based modeling. Because the differences between MVPA measures varied with average values ([AAS + GT1M] / 2), they were examined as a percentage of average physical activity. t-tests were used to assess unadjusted group differences and changes over time. ANCOVA models tested intervention effects on measurement error at follow-up, adjusted for baseline.

Results: Agreement worsened, and variability in the difference measures became greater, as the average amount of MVPA increased. Measurement error differed significantly between groups at follow-up (P = 0.010) but not at baseline (P = 0.157) and changed significantly within the intervention group (P = 0.001) but not the control group (P = 0.164). There was a statistically significant effect of the intervention on measurement error (P = 0.026).

Conclusions: Measurement error of self-report relative to the accelerometer appeared to be affected by intervention. Because measurement error cannot be definitively attributed to self-report or accelerometer, it would be prudent to measure both in future studies.
Keyword Validity
Randomized controlled trial
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Cancer Prevention Research Centre Publications
Official 2014 Collection
School of Public Health Publications
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Citation counts: TR Web of Science Citation Count  Cited 3 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 3 times in Scopus Article | Citations
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