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Validity of treadmill- and track-based individual calibration methods for estimating free-living walking speed and VO2 using the Actigraph accelerometer591.86 kB
Published VersionCC BY V4.0, Open Access
Journal article
Validity of treadmill- and track-based individual calibration methods for estimating free-living walking speed and VO2 using the Actigraph accelerometer
BMC Sports Science, Medicine & Rehabilitation, Vol.7, pp.1-11
2015
PMCID: PMC4660796
PMID: 26613044
Abstract
Background: For many patients clinical prescription of walking will be beneficial to health and accelerometers can be used to monitor their walking intensity, frequency and duration over many days. Walking intensity should include establishment of individual specific accelerometer count, walking speed and energy expenditure (VO 2) relationships and this can be achieved using a walking protocol on a treadmill or overground. However, differences in gait mechanics during treadmill compared to overground walking may result in inaccurate estimations of free-living walking speed and VO 2. The aims of this study were to compare the validity of track-and treadmill-based calibration methods for estimating free-living level walking speed and VO 2 and to explain between-method differences in accuracy of estimation. Methods: Fifty healthy adults [32 women and 18 men; mean (SD): 40 (13) years] walked at four predetermined speeds on an outdoor track and a treadmill, and completed three 1-km self-paced level walks while wearing an Actigraph monitor and a mobile oxygen analyser. Speed-and VO 2-to-Actigraph count individual calibration equations were computed for each calibration method. Between-method differences in calibration equation parameters, prediction errors, and relationships of walking speed with VO 2 and Actigraph counts were assessed. Results: The treadmill-calibration equation overestimated free-living walking speed (on average, by 0.7 km · h −1) and VO 2 (by 4.99 ml · kg −1 · min −1), while the track-calibration equation did not. This was because treadmill walking, from which the calibration equation was derived, produced lower Actigraph counts and higher VO 2 for a given walking speed compared to walking on a track. The prediction error associated with the use of the treadmill-calibration method increased with free-living walking speed. This issue was not observed when using the track-calibration method. Conclusions: The proposed track-based individual accelerometer calibration method can provide accurate and unbiased estimates of free-living walking speed and VO 2 from walking. The treadmill-based calibration produces calibration equations that tend to substantially overestimate both VO 2 and speed.
Details
- Title
- Validity of treadmill- and track-based individual calibration methods for estimating free-living walking speed and VO2 using the Actigraph accelerometer
- Authors
- Anthony Barnett (Author) - Australian Catholic UniversityEster Cerin (Author) - Deakin UniversityCorneel Vandelanotte (Author) - Central Queensland UniversityAya Matsumoto (Author) - Baker Heart and Diabetes InstituteDavid Jenkins (Author) - The University of Queensland
- Publication details
- BMC Sports Science, Medicine & Rehabilitation, Vol.7, pp.1-11
- Publisher
- BioMed Central
- Date published
- 2015
- DOI
- 10.1186/s13102-015-0024-7
- ISSN
- 2052-1847; 2052-1847
- PMID
- 26613044; PMC4660796
- Copyright note
- © 2015 Barnett et al. 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.
- Organisation Unit
- University of the Sunshine Coast, Queensland; School of Health and Sport Sciences - Legacy; School of Health and Behavioural Sciences - Legacy
- Language
- English
- Record Identifier
- 99488705902621
- Output Type
- Journal article
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