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New relative intensity ambulatory accelerometer thresholds for elderly men and women: the Generation 100 study

BACKGROUND: Public health initiatives world-wide recommend increasing physical activity (PA) to improve health. However, the dose and the intensity of PA producing the most benefit are still debated. Accurate assessment of PA is necessary in order to 1) investigate the dose–response relationship bet...

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Autores principales: Zisko, Nina, Carlsen, Trude, Salvesen, Øyvind, Aspvik, Nils Petter, Ingebrigtsen, Jan Erik, Wisløff, Ulrik, Stensvold, Dorthe
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4524358/
https://www.ncbi.nlm.nih.gov/pubmed/26238198
http://dx.doi.org/10.1186/s12877-015-0093-1
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author Zisko, Nina
Carlsen, Trude
Salvesen, Øyvind
Aspvik, Nils Petter
Ingebrigtsen, Jan Erik
Wisløff, Ulrik
Stensvold, Dorthe
author_facet Zisko, Nina
Carlsen, Trude
Salvesen, Øyvind
Aspvik, Nils Petter
Ingebrigtsen, Jan Erik
Wisløff, Ulrik
Stensvold, Dorthe
author_sort Zisko, Nina
collection PubMed
description BACKGROUND: Public health initiatives world-wide recommend increasing physical activity (PA) to improve health. However, the dose and the intensity of PA producing the most benefit are still debated. Accurate assessment of PA is necessary in order to 1) investigate the dose–response relationship between PA and health, 2) shape the most beneficial public health initiatives and 3) test the effectiveness of such initiatives. Actigraph accelerometer is widely used to objectively assess PA, and the raw data is given in counts per unit time. Count-thresholds for low, moderate and vigorous PA are mostly based on absolute intensity. This leads to largely inadequate PA intensity assessment in a large proportion of the elderly, who due to their declining maximal oxygen uptake (VO(2max)) cannot reach the moderate/vigorous intensity as defined in absolute terms. To resolve this issue, here we report relative Actigraph intensity-thresholds for the elderly. METHODS: Submaximal-oxygen-uptake, VO(2max) and maximal heart rate (HR(max)) were measured in 111 70–77 year olds, while wearing an Actigraph-GT3X+. Relationship between VO(2max) percentage (%), counts-per-minute (CPM) and gender (for both the vertical-axis (VA) and vector-magnitude (VM)) and VO(2max)% and HR(max)% was established using a mixed-regression-model. VM-and VA-models were tested against each other to see which model predicts intensity of PA better. RESULTS: VO(2max) and gender significantly affected number of CPM at different PA intensities (p < 0.05). Therefore, intensity-thresholds were created for both men and women of ranging VO(2max) values (low, medium, high). VM-model was found to be a better predictor of PA-intensity than VA-model (p < 0.05). Established thresholds for moderate intensity (46−63 % of VO(2max)) ranged from 669–3367 and 834–4048 CPM and vigorous intensity (64−90 % of VO(2max)) from 1625–4868 and 2012-5423CPM, for women and men, respectively. Lastly, we used this evidence to derive a formula that predicts customized relative intensity of PA (either VO(2max)% or HR(max)%) using counts-per-minute values as input. CONCLUSION: Intensity-thresholds depend on VO(2max), gender and Actigraph-axis. PA intensity-thresholds that take all these factors into account allow for more accurate relative intensity PA assessment in the elderly and will be useful in future PA research. TRIAL REGISTRATION: (ClinicalTrials.gov Identifier: NCT02017847, registered 17. December 2013)
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spelling pubmed-45243582015-08-05 New relative intensity ambulatory accelerometer thresholds for elderly men and women: the Generation 100 study Zisko, Nina Carlsen, Trude Salvesen, Øyvind Aspvik, Nils Petter Ingebrigtsen, Jan Erik Wisløff, Ulrik Stensvold, Dorthe BMC Geriatr Research Article BACKGROUND: Public health initiatives world-wide recommend increasing physical activity (PA) to improve health. However, the dose and the intensity of PA producing the most benefit are still debated. Accurate assessment of PA is necessary in order to 1) investigate the dose–response relationship between PA and health, 2) shape the most beneficial public health initiatives and 3) test the effectiveness of such initiatives. Actigraph accelerometer is widely used to objectively assess PA, and the raw data is given in counts per unit time. Count-thresholds for low, moderate and vigorous PA are mostly based on absolute intensity. This leads to largely inadequate PA intensity assessment in a large proportion of the elderly, who due to their declining maximal oxygen uptake (VO(2max)) cannot reach the moderate/vigorous intensity as defined in absolute terms. To resolve this issue, here we report relative Actigraph intensity-thresholds for the elderly. METHODS: Submaximal-oxygen-uptake, VO(2max) and maximal heart rate (HR(max)) were measured in 111 70–77 year olds, while wearing an Actigraph-GT3X+. Relationship between VO(2max) percentage (%), counts-per-minute (CPM) and gender (for both the vertical-axis (VA) and vector-magnitude (VM)) and VO(2max)% and HR(max)% was established using a mixed-regression-model. VM-and VA-models were tested against each other to see which model predicts intensity of PA better. RESULTS: VO(2max) and gender significantly affected number of CPM at different PA intensities (p < 0.05). Therefore, intensity-thresholds were created for both men and women of ranging VO(2max) values (low, medium, high). VM-model was found to be a better predictor of PA-intensity than VA-model (p < 0.05). Established thresholds for moderate intensity (46−63 % of VO(2max)) ranged from 669–3367 and 834–4048 CPM and vigorous intensity (64−90 % of VO(2max)) from 1625–4868 and 2012-5423CPM, for women and men, respectively. Lastly, we used this evidence to derive a formula that predicts customized relative intensity of PA (either VO(2max)% or HR(max)%) using counts-per-minute values as input. CONCLUSION: Intensity-thresholds depend on VO(2max), gender and Actigraph-axis. PA intensity-thresholds that take all these factors into account allow for more accurate relative intensity PA assessment in the elderly and will be useful in future PA research. TRIAL REGISTRATION: (ClinicalTrials.gov Identifier: NCT02017847, registered 17. December 2013) BioMed Central 2015-08-04 /pmc/articles/PMC4524358/ /pubmed/26238198 http://dx.doi.org/10.1186/s12877-015-0093-1 Text en © Zisko 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
Zisko, Nina
Carlsen, Trude
Salvesen, Øyvind
Aspvik, Nils Petter
Ingebrigtsen, Jan Erik
Wisløff, Ulrik
Stensvold, Dorthe
New relative intensity ambulatory accelerometer thresholds for elderly men and women: the Generation 100 study
title New relative intensity ambulatory accelerometer thresholds for elderly men and women: the Generation 100 study
title_full New relative intensity ambulatory accelerometer thresholds for elderly men and women: the Generation 100 study
title_fullStr New relative intensity ambulatory accelerometer thresholds for elderly men and women: the Generation 100 study
title_full_unstemmed New relative intensity ambulatory accelerometer thresholds for elderly men and women: the Generation 100 study
title_short New relative intensity ambulatory accelerometer thresholds for elderly men and women: the Generation 100 study
title_sort new relative intensity ambulatory accelerometer thresholds for elderly men and women: the generation 100 study
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4524358/
https://www.ncbi.nlm.nih.gov/pubmed/26238198
http://dx.doi.org/10.1186/s12877-015-0093-1
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