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Research ArticleOriginal Research

Sedentary Behavior Is an Independent Predictor of Mortality in Subjects With COPD

Karina C Furlanetto, Leila Donária, Lorena P Schneider, José R Lopes, Marcos Ribeiro, Karen BP Fernandes, Nidia A Hernandes and Fabio Pitta
Respiratory Care May 2017, 62 (5) 579-587; DOI: https://doi.org/10.4187/respcare.05306
Karina C Furlanetto
Laboratory of Research in Respiratory Physiotherapy (LFIP), Department of Physiotherapy
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Leila Donária
Laboratory of Research in Respiratory Physiotherapy (LFIP), Department of Physiotherapy
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Lorena P Schneider
Laboratory of Research in Respiratory Physiotherapy (LFIP), Department of Physiotherapy
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José R Lopes
Laboratory of Research in Respiratory Physiotherapy (LFIP), Department of Physiotherapy
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Marcos Ribeiro
Laboratory of Research in Respiratory Physiotherapy (LFIP), Department of Physiotherapy
Department of Medicine, Universidade Estadual de Londrina (UEL), Londrina, Brazil.
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Karen BP Fernandes
Biological and Health Sciences Research Center, Universidade Norte do Paraná (UNOPAR), Londrina, Paraná, Brazil.
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Nidia A Hernandes
Laboratory of Research in Respiratory Physiotherapy (LFIP), Department of Physiotherapy
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Fabio Pitta
Laboratory of Research in Respiratory Physiotherapy (LFIP), Department of Physiotherapy
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  • For correspondence: [email protected]
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Abstract

BACKGROUND: The terms sedentary behavior and physical inactivity have been confusingly mixed. Although the association between physical inactivity and mortality has been shown previously in subjects with COPD, this association had not yet been investigated with regard to sedentarism. The aim of this work was to investigate the impact of sedentary behavior on mortality of subjects with COPD and to propose a cutoff point of sedentarism with prognostic value.

METHODS: In this retrospective cohort study, sedentary behavior was assessed with 2 activity monitors (DynaPort and Sensewear armband) in 101 subjects with COPD from 2006 to 2011. Vital status was then ascertained in 2015. The following 6 variables of sedentary behavior were analyzed: average of metabolic equivalent of task (MET)/d (reflecting intensity); time spent/d lying, sitting, and lying + sitting (reflecting duration of sedentary postures); and time spent/d in activities requiring <1.5 MET and <2 MET (reflecting intensity and duration of sedentary time). Cutoff points for sedentarism and their respective prognostic values were investigated for each variable.

RESULTS: Forty-one subjects (41%) died over a median (interquartile range) follow-up period of 62 (43–88) months. After adjusting for potential confounders in the Cox regression model, cutoff points from variables that combine duration of sedentary time and intensity <1.5 MET or <2 MET were associated with the increased risk of mortality. The strongest independent cutoff for predicting mortality was ≥8.5 h/d spent in sedentary activities <1.5 MET (area under the curve 0.76; hazard ratio 4.09, 95% CI 1.90–8.78; P < .001).

CONCLUSIONS: Sedentary behavior was an independent predictor of mortality in subjects with COPD, even adjusting for moderate-to-vigorous physical activity and a number of other variables. Mortality was higher in subjects with COPD who spend ≥8.5 h/d in activities requiring <1.5 MET. These findings may open room for future studies aiming at decreasing sedentary time as a promising strategy to reduce mortality risk in subjects with COPD.

  • chronic obstructive pulmonary disease
  • sedentary lifestyle
  • physical activity
  • mortality
  • longitudinal studies
  • survival analysis

Footnotes

  • Correspondence: Fabio Pitta PhD, Departamento de Fisioterapia, CCS, Hospital Universitário de Londrina, Av. Robert Koch, 60, Vila Operaria, 86038-350, Londrina, Paraná, Brazil. E-mail: fabiopitta{at}uol.com.br.
  • This work was supported by Fundação Araucária and CNPq, Brazil. Dr Furlanetto and Ms Donária are supported by PhD grants from CAPES/Brazil. Dr Pitta is supported by a research grant from CNPq/Brazil. The authors have disclosed no conflicts of interest.

  • Dr Furlanetto presented a version of this work at the European Respiratory Society Annual Congress 2016, held September 3–7, 2016, in London, UK.

  • Copyright © 2017 by Daedalus Enterprises
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Respiratory Care: 62 (5)
Respiratory Care
Vol. 62, Issue 5
1 May 2017
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Sedentary Behavior Is an Independent Predictor of Mortality in Subjects With COPD
Karina C Furlanetto, Leila Donária, Lorena P Schneider, José R Lopes, Marcos Ribeiro, Karen BP Fernandes, Nidia A Hernandes, Fabio Pitta
Respiratory Care May 2017, 62 (5) 579-587; DOI: 10.4187/respcare.05306

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Sedentary Behavior Is an Independent Predictor of Mortality in Subjects With COPD
Karina C Furlanetto, Leila Donária, Lorena P Schneider, José R Lopes, Marcos Ribeiro, Karen BP Fernandes, Nidia A Hernandes, Fabio Pitta
Respiratory Care May 2017, 62 (5) 579-587; DOI: 10.4187/respcare.05306
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Keywords

  • chronic obstructive pulmonary disease
  • sedentary lifestyle
  • physical activity
  • mortality
  • longitudinal studies
  • survival analysis

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