期刊
APPLIED PHYSIOLOGY NUTRITION AND METABOLISM
卷 45, 期 11, 页码 1232-1237出版社
CANADIAN SCIENCE PUBLISHING
DOI: 10.1139/apnm-2020-0149
关键词
COPD; muscle dysfunction; endurance exercise; eccentric exercise; cycle ergometer; rehabilitation
资金
- National Commission for Scientific and Technological Research of Chile (CONICYT) [11150293]
We aimed to compare the cardiorespiratory, metabolic, and perceptual responses to high- and moderate-intensity eccentric cycling versus moderate-intensity concentric cycling in chronic obstructive pulmonary disease (COPD) patients. Ten patients with moderate COPD (forced expiratory volume in 1 s (FEV1) = 68.6% +/- 20.4% of predicted; 68.3 +/- 9.1 years) performed 30 min of moderate-intensity concentric (CONC-M: 50% maximum workload; W-max), moderate-intensity eccentric (ECC-M: 50% W-max), and high-intensity eccentric (ECC-H: 100% W-max) cycling. Average power output, oxygen consumption ((V)over dotO(2)), minute ventilation (VE), respiratory frequency (f(R)), oxygen saturation (SpO(2)), heart rate (HR), systolic and diastolic blood pressure (SBP and DBP), rate of perceived exertion (RPE), and dyspnea were measured during cycling. Compared with CONC-M, lower (V)over dotO(2) (-52% +/- 14%), VE (-47% +/- 16%), f(R) (-21% +/- 14%), HR (-14% +/- 16%), SBP (-73% +/- 54%), RPE (-36% +/- 26%), and dyspnea (-41% +/- 37%) were found during ECC-M. During ECC-H, a similar metabolic demand to CONC-M was found. However, average power output was 117% +/- 79% higher during ECC-H. Eccentric cycling can be safely performed by COPD patients and induced lower cardiorespiratory, metabolic, and perceptual responses than concentric exercise when performed at the same workload. Novelty Moderate- and high-intensity eccentric cycling can be performed by COPD patients. Moderate-intensity eccentric cycling showed lower cardiorespiratory, metabolic, and perceptual demand than concentric cycling at the same workload in COPD patients. Even at double workload, eccentric cycling induces lower cardiorespiratory, metabolic, and perceptual demand than moderate-intensity concentric cycling.
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