Continuous and intermittent exercise responses in individuals with chronic obstructive pulmonary disease

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Title Continuous and intermittent exercise responses in individuals with chronic obstructive pulmonary disease
Author Sabapathy, Surendran; Kingsley, Rebecca Anne; Schneider, Donald Anthony; Adams, Lewis; Morris, Norman
Journal Name Thorax
Editor J. A. Wedzicha
Year Published 2004
Place of publication United Kingdom
Publisher BMJ Publishing Group
Abstract Background: While the acute physiological responses to continuous exercise have been well documented in individuals with chronic obstructive pulmonary disease (COPD), no previous study has examined the response to intermittent exercise in these patients. Methods: We examined the physiological responses of 10 individuals with moderate COPD (forced expiratory volume in 1 second 52 (15)% predicted) who performed both an intermittent (1 min exercise and rest intervals) and a continuous cycle ergometer test on separate days. Both intermittent and continuous exercise tests were performed at the same power output, calculated as 70% of the peak power attained during an incremental exercise test. Results: Intermittent exercise was associated with significantly lower values for oxygen uptake, carbon dioxide output, expired ventilation, heart rate, plasma lactate concentration, and ratings of breathlessness than continuous exercise. Subjects were able to complete a significantly greater total amount of work during intermittent exercise (71 (32) kJ) than during continuous exercise (31 (24) kJ). The degree of dynamic lung hyperinflation (change in end expiratory lung volume) was significantly lower during intermittent exercise (0.23 (0.07) l) than in continuous exercise (0.52 (0.13) l). Conclusions: The greater amount of work performed and lower measured physiological responses achieved with intermittent exercise may allow for greater peripheral training adaptations in individuals with more limited lung function. The results suggest that intermittent exercise may be superior to continuous exercise as a mode of training for patients with COPD.
Peer Reviewed Yes
Published Yes
Publisher URI http://dx.doi.org/10.1136/thx.2004.026617
Alternative URI http://group.bmj.com/
Copyright Statement Copyright remains with the authors 2004. The attached file is posted here with permission of the copyright owners for your personal use only. No further distribution permitted. For information about this journal please refer to the publisher's website or contact the authors.
Volume 59
Issue Number 12
Page from 1026
Page to 1031
ISSN 0040-6376
Date Accessioned 2005-03-17
Date Available 2009-01-19
Language en_AU
Research Centre Griffith Health Institute; Heart Foundation Research Centre
Faculty Griffith Health Faculty
Subject PRE2009-Exercise Physiology; PRE2009-Respiratory Diseases
URI http://hdl.handle.net/10072/5549
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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