A Non-Interventional, Cross-Sectional Study to Evaluate Factors Relating to Daily Step Counts and Physical Activity in Japanese Patients with Chronic Obstructive Pulmonary Disease: STEP COPD

Masakazu Ichinose, Yoshiaki Minakata, Takashi Motegi, Tsuneyuki Takahashi, Munehiro Seki, Satoko Sugaya, Nobuya Hayashi, Ichiro Kuwahira, Masakazu Ichinose, Yoshiaki Minakata, Takashi Motegi, Tsuneyuki Takahashi, Munehiro Seki, Satoko Sugaya, Nobuya Hayashi, Ichiro Kuwahira

Abstract

Purpose: Patients with chronic obstructive pulmonary disease (COPD) have decreased physical activity (PA) compared with healthy adults. As lower PA is associated with increased mortality, improving PA is an important objective for COPD management. This large-scale, multicenter, non-interventional, cross-sectional study examined the activity status of COPD patients in Japan and explored factors related to PA.

Patients and methods: Outpatients aged ≥40 years with confirmed COPD diagnosis and pulmonary function test data were enrolled. Primary study outcomes were measurement of daily steps (over 14 consecutive days, using an activity monitor), assessment of activity time by activity intensity (using metabolic equivalents [METs]), and evaluation of correlation between PA and patient characteristics. Secondary outcomes included further investigation of the influence of patient characteristics on PA.

Results: Data from 417 patients with Global Initiative for Chronic Obstructive Lung Disease (GOLD) stages I (29.5%), II (43.9%), III (23.5%), and IV (3.1%) were evaluated. Median (Q1, Q3) daily step count was 3440.8 (1831.3, 5709.3). Median (Q1, Q3) durations of PA at ≥3 (moderate-to-vigorous) and ≥2 METs (light-to-vigorous) were 18.7 (6.5, 41.3) and 186.9 (126.9, 259.2) minutes, respectively. For >30% of patients, time spent in ≥3 METs activity was ≤10 minutes. Unemployment was significantly correlated with reduced activity time (≥3 and ≥2 METs) and step count. Severe GOLD stage was significantly correlated with reduced activity time (≥3 and ≥2 METs). High modified Medical Research Council (mMRC) dyspnea score was significantly correlated with reduced activity time (≥3 METs) and step count. Patients tended to overestimate the time spent in activities requiring ≥2 METs in their subjective reports compared with activity monitor measurements.

Conclusion: Reduced PA was observed in the Japanese COPD patients with the majority of them being GOLD stage I/II. Employment status, GOLD stage, and mMRC dyspnea score could help identify patients at risk of reduced PA.

Clinical trial registration: NCT03642613 (ClinicalTrials.gov); UMIN000032962 (UMIN-CTR, umin.ac.jp).

Keywords: COPD; activity monitor; physical activity; pulmonary function; step counts.

Conflict of interest statement

Masakazu Ichinose has received honoraria for speaking from AstraZeneca, GSK, and Nippon Boehringer Ingelheim. Yoshiaki Minakata has received personal fees from AstraZeneca K.K. and Nippon Boehringer Ingelheim outside the submitted work. Takashi Motegi has received personal fees from AstraZeneca K.K. for the submitted work, and personal fees from Nippon Boehringer Ingelheim outside the submitted work. Ichiro Kuwahira has received honoraria for speaking from AstraZeneca, GSK, Nippon Boehringer Ingelheim, and Meiji Seika Pharma. Munehiro Seki, Satoko Sugaya, and Nobuya Hayashi are employees of AstraZeneca K.K. The authors report no other conflicts of interest in this work.

© 2020 Ichinose et al.

Figures

Figure 1
Figure 1
Patient disposition.
Figure 2
Figure 2
Daily activity. (A) The frequency of steps for the AMC-FAS population. (B) Activity time for physical activity at ≥3.0 METs. (C) Activity time for physical activity at ≥2.0 METs.
Figure 3
Figure 3
Correlations between the total activity time in patients achieving ≥2 METs and patient-reported durations of activities equivalent to ≥2 METs.

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