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Physical activity declines in COPD while exercise capacity remains stable: A longitudinal study over 5 years


Sievi, Noriane A; Brack, Thomas; Brutsche, Martin H; Frey, Martin; Irani, Sarosh; Leuppi, Jörg D; Thurnheer, Robert; Kohler, Malcolm; Clarenbach, Christian F (2018). Physical activity declines in COPD while exercise capacity remains stable: A longitudinal study over 5 years. Respiratory Medicine, 141:1-6.

Abstract

BACKGROUND AND OBJECTIVE Daily physical activity (PA) and exercise capacity are reduced in patients with COPD. Whether the natural longitudinal course of both appears synchronically or one precedes the other is currently unclear. The aim was to assess the longitudinal relationship between exercise capacity and physical activity and their changes over time in patients with COPD. METHODS In a longitudinal observation-study of heterogeneous COPD patients, recruited from pulmonary outpatient clinics or hospital settings, we annually investigated two exercise capacity tests (1-min sit to stand test (STS) and 6 min walking test (6MWT)) and daily physical activity assessed by number of steps per day for minimum one, up to seven years. Univariable and multivariable mixed effect models were used to investigate the annual change in STS, 6MWD and number of steps per day. RESULTS 202 COPD patients (17% COPD risk group (considers symptoms and future exacerbation risk to grade disease severity) A, 49% B, 4% C and 34% D) with a mean (min/max) follow-up time of 2.4 (0.9/6.8) years were annually assessed. The number of steps per day decreased significantly over time (annual mean (95% CI) of -451.0 (-605.3/-296.6) steps, p < 0.001) while STS and 6MWD remained stable. CONCLUSION Our findings suggest that COPD patients are increasingly impaired in their daily PA while exercise capacity remains stable during the study period. Thus, the longitudinal decline in PA seems not to be explained by a concomitant reduction in exercise tolerance. CLINICAL TRIAL REGISTRATION www.Clinicaltrials.Gov, NCT01527773.

Abstract

BACKGROUND AND OBJECTIVE Daily physical activity (PA) and exercise capacity are reduced in patients with COPD. Whether the natural longitudinal course of both appears synchronically or one precedes the other is currently unclear. The aim was to assess the longitudinal relationship between exercise capacity and physical activity and their changes over time in patients with COPD. METHODS In a longitudinal observation-study of heterogeneous COPD patients, recruited from pulmonary outpatient clinics or hospital settings, we annually investigated two exercise capacity tests (1-min sit to stand test (STS) and 6 min walking test (6MWT)) and daily physical activity assessed by number of steps per day for minimum one, up to seven years. Univariable and multivariable mixed effect models were used to investigate the annual change in STS, 6MWD and number of steps per day. RESULTS 202 COPD patients (17% COPD risk group (considers symptoms and future exacerbation risk to grade disease severity) A, 49% B, 4% C and 34% D) with a mean (min/max) follow-up time of 2.4 (0.9/6.8) years were annually assessed. The number of steps per day decreased significantly over time (annual mean (95% CI) of -451.0 (-605.3/-296.6) steps, p < 0.001) while STS and 6MWD remained stable. CONCLUSION Our findings suggest that COPD patients are increasingly impaired in their daily PA while exercise capacity remains stable during the study period. Thus, the longitudinal decline in PA seems not to be explained by a concomitant reduction in exercise tolerance. CLINICAL TRIAL REGISTRATION www.Clinicaltrials.Gov, NCT01527773.

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Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > University Hospital Zurich > Clinic for Pneumology
Dewey Decimal Classification:610 Medicine & health
Language:English
Date:August 2018
Deposited On:03 Jan 2019 13:29
Last Modified:03 Jan 2019 13:40
Publisher:Elsevier
ISSN:0954-6111
OA Status:Closed
Publisher DOI:https://doi.org/10.1016/j.rmed.2018.06.013
PubMed ID:30053953

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