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Title: A basis for harmonisation of accelerometer physical activity outcomes in epidemiology
Authors: Rowlands, A
Plekhanova, T
Yates, T
Mirkes, E
Davies, M
Khunti, K
Edwardson, C
First Published: 2019
Publisher: Human Kinetics
Citation: Journal for the Measurement of Physical Behaviours, 2019, In Press
Abstract: Introduction: To capitalise on the increasing availability of accelerometry data for epidemiological research it is desirable to compare and/or pool data from surveys worldwide. This study aimed to establish whether free-living physical activity outcomes can be considered equivalent between three research-grade accelerometer brands worn on the dominant and non-dominant wrist. Of prime interest were the average acceleration (ACC) and the intensity gradient (IG); these two metrics describe the volume and intensity of the complete activity profile, further they are comparable across populations making them ideal for comparing and/or pooling activity data. Methods: Forty-eight adults wore a GENEActiv, Axivity and ActiGraph on both wrists for up to 7-days. Data were processed using opensource software (GGIR) to generate physical activity outcomes, including ACC and IG. Agreement was assessed using pairwise 95% equivalence tests (±10% equivalence zone) and intra-class correlation coefficients (ICC). Results: ACC was equivalent between brands when measured at the non-dominant wrist (ICC>0.93), but approximately 10% higher when measured at the dominant wrist (GENEActiv and Axivity only, ICC>0.83). The IG was equivalent irrespective of monitor brand or wrist (ICC>0.88). After adjusting ACC measured at the dominant wrist by -10% (GENEActiv and Axivity only), ACC was also within (or marginally outside) the 10% equivalence zone for all monitor pairings. Conclusion: If average acceleration is decreased by 10% for studies deploying monitors on the dominant wrist (GENEActiv and Axivity only), ACC and IG may be suitable for comparing and/or collating physical activity outcomes across accelerometer datasets, regardless of monitor brand and wrist.
ISSN: 2575-6605
eISSN: 2575-6613
Links: TBA
Embargo on file until: 1-Jan-10000
Version: Post-print
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2019, Human Kinetics. Deposited with reference to the publisher’s open access archiving policy. (
Description: Anonymised datasets generated during the current study are available on reasonable request. Requests for access to data should be addressed to the corresponding author at All proposals requesting data access will need to specify how it is planned to use the data, and all proposals will need approval of the co-investigator team before data release.
The file associated with this record is under embargo until publication, in accordance with the publisher's self-archiving policy. The full text may be available through the publisher links provided above.
Appears in Collections:Published Articles, Dept. of Cardiovascular Sciences

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