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Simple standard equation for daily step count in Japanese patients with chronic obstructive pulmonary disease

PURPOSE: The improvement of physical activity in patients with COPD is an important issue. However, no standard for the recommended number of steps for patients with COPD has been determined. We conducted a retrospective observational study to create a simple standard equation for the daily step cou...

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Autores principales: Nakanishi, Masanori, Minakata, Yoshiaki, Tanaka, Rie, Sugiura, Hisatoshi, Kuroda, Hikaru, Yoshida, Makoto, Yamamoto, Nobuyuki
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Dove 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6724423/
https://www.ncbi.nlm.nih.gov/pubmed/31564845
http://dx.doi.org/10.2147/COPD.S218705
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author Nakanishi, Masanori
Minakata, Yoshiaki
Tanaka, Rie
Sugiura, Hisatoshi
Kuroda, Hikaru
Yoshida, Makoto
Yamamoto, Nobuyuki
author_facet Nakanishi, Masanori
Minakata, Yoshiaki
Tanaka, Rie
Sugiura, Hisatoshi
Kuroda, Hikaru
Yoshida, Makoto
Yamamoto, Nobuyuki
author_sort Nakanishi, Masanori
collection PubMed
description PURPOSE: The improvement of physical activity in patients with COPD is an important issue. However, no standard for the recommended number of steps for patients with COPD has been determined. We conducted a retrospective observational study to create a simple standard equation for the daily step count, which makes it easier to determine whether each subject is attaining his/her predicted value or not. PATIENTS AND METHODS: Stable outpatients diagnosed with COPD whose physical activities had been measured using a triaxial accelerometer for more than 2 weeks were recruited from 5 institutes in Japan. Factors associated with the step count were detected by multivariate regression analysis. After the data were transformed to a normalized distribution, a multivariate linear regression equation was created using stepwise regression. RESULTS: One hundred sixty-two patients aged 72.3 (7.2) years and of FEV1 %pred 59.2 (22.8) % were recruited. Among the parameters, age, mMRC dyspnea scale and inspiratory capacity (IC) were detected by the stepwise method. The created standard equation was “Step count = (−0.079×[age]−1.595×[mMRC]+2.078×[IC]+18.149)(3)”. The correlations between the calculated values and the measured values were observed, and fixed, and proportional biases between them were also observed. When patients with <6500 steps/day were selected, no systematic bias between them could be detected. CONCLUSION: A simple standard equation for Japanese patients with COPD was created using age, mMRC and IC, and could provide an individual-predicted value, especially for patients with <6500 steps/day.
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spelling pubmed-67244232019-09-27 Simple standard equation for daily step count in Japanese patients with chronic obstructive pulmonary disease Nakanishi, Masanori Minakata, Yoshiaki Tanaka, Rie Sugiura, Hisatoshi Kuroda, Hikaru Yoshida, Makoto Yamamoto, Nobuyuki Int J Chron Obstruct Pulmon Dis Original Research PURPOSE: The improvement of physical activity in patients with COPD is an important issue. However, no standard for the recommended number of steps for patients with COPD has been determined. We conducted a retrospective observational study to create a simple standard equation for the daily step count, which makes it easier to determine whether each subject is attaining his/her predicted value or not. PATIENTS AND METHODS: Stable outpatients diagnosed with COPD whose physical activities had been measured using a triaxial accelerometer for more than 2 weeks were recruited from 5 institutes in Japan. Factors associated with the step count were detected by multivariate regression analysis. After the data were transformed to a normalized distribution, a multivariate linear regression equation was created using stepwise regression. RESULTS: One hundred sixty-two patients aged 72.3 (7.2) years and of FEV1 %pred 59.2 (22.8) % were recruited. Among the parameters, age, mMRC dyspnea scale and inspiratory capacity (IC) were detected by the stepwise method. The created standard equation was “Step count = (−0.079×[age]−1.595×[mMRC]+2.078×[IC]+18.149)(3)”. The correlations between the calculated values and the measured values were observed, and fixed, and proportional biases between them were also observed. When patients with <6500 steps/day were selected, no systematic bias between them could be detected. CONCLUSION: A simple standard equation for Japanese patients with COPD was created using age, mMRC and IC, and could provide an individual-predicted value, especially for patients with <6500 steps/day. Dove 2019-08-30 /pmc/articles/PMC6724423/ /pubmed/31564845 http://dx.doi.org/10.2147/COPD.S218705 Text en © 2019 Nakanishi et al. http://creativecommons.org/licenses/by-nc/3.0/ This work is published and licensed by Dove Medical Press Limited. The full terms of this license are available at https://www.dovepress.com/terms.php and incorporate the Creative Commons Attribution – Non Commercial (unported, v3.0) License (http://creativecommons.org/licenses/by-nc/3.0/). By accessing the work you hereby accept the Terms. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed. For permission for commercial use of this work, please see paragraphs 4.2 and 5 of our Terms (https://www.dovepress.com/terms.php).
spellingShingle Original Research
Nakanishi, Masanori
Minakata, Yoshiaki
Tanaka, Rie
Sugiura, Hisatoshi
Kuroda, Hikaru
Yoshida, Makoto
Yamamoto, Nobuyuki
Simple standard equation for daily step count in Japanese patients with chronic obstructive pulmonary disease
title Simple standard equation for daily step count in Japanese patients with chronic obstructive pulmonary disease
title_full Simple standard equation for daily step count in Japanese patients with chronic obstructive pulmonary disease
title_fullStr Simple standard equation for daily step count in Japanese patients with chronic obstructive pulmonary disease
title_full_unstemmed Simple standard equation for daily step count in Japanese patients with chronic obstructive pulmonary disease
title_short Simple standard equation for daily step count in Japanese patients with chronic obstructive pulmonary disease
title_sort simple standard equation for daily step count in japanese patients with chronic obstructive pulmonary disease
topic Original Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6724423/
https://www.ncbi.nlm.nih.gov/pubmed/31564845
http://dx.doi.org/10.2147/COPD.S218705
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