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Validity of treadmill- and track-based individual calibration methods for estimating free-living walking speed and VO(2) using the Actigraph accelerometer
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 spe...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
BioMed Central
2015
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4660796/ https://www.ncbi.nlm.nih.gov/pubmed/26613044 http://dx.doi.org/10.1186/s13102-015-0024-7 |
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author | Barnett, Anthony Cerin, Ester Vandelanotte, Corneel Matsumoto, Aya Jenkins, David |
author_facet | Barnett, Anthony Cerin, Ester Vandelanotte, Corneel Matsumoto, Aya Jenkins, David |
author_sort | Barnett, Anthony |
collection | PubMed |
description | 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 pre-determined 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. |
format | Online Article Text |
id | pubmed-4660796 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | BioMed Central |
record_format | MEDLINE/PubMed |
spelling | pubmed-46607962015-11-27 Validity of treadmill- and track-based individual calibration methods for estimating free-living walking speed and VO(2) using the Actigraph accelerometer Barnett, Anthony Cerin, Ester Vandelanotte, Corneel Matsumoto, Aya Jenkins, David BMC Sports Sci Med Rehabil Research Article 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 pre-determined 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. BioMed Central 2015-11-25 /pmc/articles/PMC4660796/ /pubmed/26613044 http://dx.doi.org/10.1186/s13102-015-0024-7 Text en © Barnett et al. 2015 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. |
spellingShingle | Research Article Barnett, Anthony Cerin, Ester Vandelanotte, Corneel Matsumoto, Aya Jenkins, David Validity of treadmill- and track-based individual calibration methods for estimating free-living walking speed and VO(2) using the Actigraph accelerometer |
title | Validity of treadmill- and track-based individual calibration methods for estimating free-living walking speed and VO(2) using the Actigraph accelerometer |
title_full | Validity of treadmill- and track-based individual calibration methods for estimating free-living walking speed and VO(2) using the Actigraph accelerometer |
title_fullStr | Validity of treadmill- and track-based individual calibration methods for estimating free-living walking speed and VO(2) using the Actigraph accelerometer |
title_full_unstemmed | Validity of treadmill- and track-based individual calibration methods for estimating free-living walking speed and VO(2) using the Actigraph accelerometer |
title_short | Validity of treadmill- and track-based individual calibration methods for estimating free-living walking speed and VO(2) using the Actigraph accelerometer |
title_sort | validity of treadmill- and track-based individual calibration methods for estimating free-living walking speed and vo(2) using the actigraph accelerometer |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4660796/ https://www.ncbi.nlm.nih.gov/pubmed/26613044 http://dx.doi.org/10.1186/s13102-015-0024-7 |
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