Moderate intense physical activity depends on selected Metabolic Equivalent of Task (MET) cut-off and type of data analysis.

<h4>Background</h4>Accelerometry data are frequently analyzed without considering whether moderate-to-vigorous physical activities (MVPA) were performed in bouts of >10 minutes as defined in most physical activity guidelines. We aimed i) to quantify MVPA by using different commonly-ap...

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Autores principales:	Hans van Remoortel, Carlos Augusto Camillo, Daniel Langer, Miek Hornikx, Heleen Demeyer, Chris Burtin, Marc Decramer, Rik Gosselink, Wim Janssens, Thierry Troosters
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2013
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/97cb38e2097f4ac095263a0f04d9ca4b
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spelling	oai:doaj.org-article:97cb38e2097f4ac095263a0f04d9ca4b2021-11-18T08:40:49ZModerate intense physical activity depends on selected Metabolic Equivalent of Task (MET) cut-off and type of data analysis.1932-620310.1371/journal.pone.0084365https://doaj.org/article/97cb38e2097f4ac095263a0f04d9ca4b2013-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/24376804/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Background</h4>Accelerometry data are frequently analyzed without considering whether moderate-to-vigorous physical activities (MVPA) were performed in bouts of >10 minutes as defined in most physical activity guidelines. We aimed i) to quantify MVPA by using different commonly-applied physical activity guidelines, ii) to investigate the effect of bouts versus non-bouts analysis, and iii) to propose and validate a MVPA non-bouts cut-point to classify (in-) active subjects.<h4>Methods</h4>Healthy subjects (n=110;62±6yrs) and patients with Chronic Obstructive Pulmonary Disease (COPD) (n=113;62±5yrs) wore an activity monitor for 7 days. Three Metabolic Equivalent of Task (MET) cut-offs and one individual target (50% VO₂ reserve) were used to define MVPA. First, all minutes of MVPA were summed up (NON-BOUTS). Secondly, only minutes performed in bouts of >10 minutes continuous activity were counted (BOUTS). Receiver operating characteristic (ROC) curve analyses were used to propose and (cross-) validate new MVPA non-bout cut-points based on the criterion of 30 minutes MVPA per day (BOUTS). Likelihood ratios (sensitivity/[1-specificity]) were used to express the association between the proposed MVPA non-bout target and the MVPA bout target of 30 minday⁻¹.<h4>Results</h4>MVPA was variable across physical activity guidelines with lowest values for age-specific cut-offs. Selecting a METs cut-point corresponding to 50% VO₂ reserve revealed no differences in MVPA between groups. MVPA's analyzed in BOUTS in healthy subjects were 2 to 4 fold lower than NON-BOUTS analyses and this was even 3 to 12 fold lower in COPD. The MVPA non-bouts cut-point of 80 minday⁻¹ using a 3 METs MVPA threshold delivered positive likelihood ratios of 5.1[1.5-19.6] (healthy subjects) and 2.3[1.6-3.3] (COPD).<h4>Conclusion</h4>MVPA varies upon the selected physical activity guideline/targets and bouts versus non-bouts analysis. Accelerometry measured MVPA non-bouts target of 80 minday⁻¹, using a 3 METs MVPA threshold, is associated to the commonly-used MVPA bout target of 30 minday⁻¹.Hans van RemoortelCarlos Augusto CamilloDaniel LangerMiek HornikxHeleen DemeyerChris BurtinMarc DecramerRik GosselinkWim JanssensThierry TroostersPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 8, Iss 12, p e84365 (2013)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Hans van Remoortel Carlos Augusto Camillo Daniel Langer Miek Hornikx Heleen Demeyer Chris Burtin Marc Decramer Rik Gosselink Wim Janssens Thierry Troosters Moderate intense physical activity depends on selected Metabolic Equivalent of Task (MET) cut-off and type of data analysis.
description	<h4>Background</h4>Accelerometry data are frequently analyzed without considering whether moderate-to-vigorous physical activities (MVPA) were performed in bouts of >10 minutes as defined in most physical activity guidelines. We aimed i) to quantify MVPA by using different commonly-applied physical activity guidelines, ii) to investigate the effect of bouts versus non-bouts analysis, and iii) to propose and validate a MVPA non-bouts cut-point to classify (in-) active subjects.<h4>Methods</h4>Healthy subjects (n=110;62±6yrs) and patients with Chronic Obstructive Pulmonary Disease (COPD) (n=113;62±5yrs) wore an activity monitor for 7 days. Three Metabolic Equivalent of Task (MET) cut-offs and one individual target (50% VO₂ reserve) were used to define MVPA. First, all minutes of MVPA were summed up (NON-BOUTS). Secondly, only minutes performed in bouts of >10 minutes continuous activity were counted (BOUTS). Receiver operating characteristic (ROC) curve analyses were used to propose and (cross-) validate new MVPA non-bout cut-points based on the criterion of 30 minutes MVPA per day (BOUTS). Likelihood ratios (sensitivity/[1-specificity]) were used to express the association between the proposed MVPA non-bout target and the MVPA bout target of 30 minday⁻¹.<h4>Results</h4>MVPA was variable across physical activity guidelines with lowest values for age-specific cut-offs. Selecting a METs cut-point corresponding to 50% VO₂ reserve revealed no differences in MVPA between groups. MVPA's analyzed in BOUTS in healthy subjects were 2 to 4 fold lower than NON-BOUTS analyses and this was even 3 to 12 fold lower in COPD. The MVPA non-bouts cut-point of 80 minday⁻¹ using a 3 METs MVPA threshold delivered positive likelihood ratios of 5.1[1.5-19.6] (healthy subjects) and 2.3[1.6-3.3] (COPD).<h4>Conclusion</h4>MVPA varies upon the selected physical activity guideline/targets and bouts versus non-bouts analysis. Accelerometry measured MVPA non-bouts target of 80 minday⁻¹, using a 3 METs MVPA threshold, is associated to the commonly-used MVPA bout target of 30 minday⁻¹.
format	article
author	Hans van Remoortel Carlos Augusto Camillo Daniel Langer Miek Hornikx Heleen Demeyer Chris Burtin Marc Decramer Rik Gosselink Wim Janssens Thierry Troosters
author_facet	Hans van Remoortel Carlos Augusto Camillo Daniel Langer Miek Hornikx Heleen Demeyer Chris Burtin Marc Decramer Rik Gosselink Wim Janssens Thierry Troosters
author_sort	Hans van Remoortel
title	Moderate intense physical activity depends on selected Metabolic Equivalent of Task (MET) cut-off and type of data analysis.
title_short	Moderate intense physical activity depends on selected Metabolic Equivalent of Task (MET) cut-off and type of data analysis.
title_full	Moderate intense physical activity depends on selected Metabolic Equivalent of Task (MET) cut-off and type of data analysis.
title_fullStr	Moderate intense physical activity depends on selected Metabolic Equivalent of Task (MET) cut-off and type of data analysis.
title_full_unstemmed	Moderate intense physical activity depends on selected Metabolic Equivalent of Task (MET) cut-off and type of data analysis.
title_sort	moderate intense physical activity depends on selected metabolic equivalent of task (met) cut-off and type of data analysis.
publisher	Public Library of Science (PLoS)
publishDate	2013
url	https://doaj.org/article/97cb38e2097f4ac095263a0f04d9ca4b
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Moderate intense physical activity depends on selected Metabolic Equivalent of Task (MET) cut-off and type of data analysis.

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