Physiological response to eccentric and concentric cycling in patients with chronic obstructive pulmonary disease

Applied Physiology, Nutrition, and Metabolism, e-First Articles. 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; Wmax), moderate-intensity eccentric (ECC-M: 50% Wmax), and high-intensity eccentric (ECC-H: 100% Wmax) cycling. Average power output, oxygen consumption (V̇O2), minute ventilat ion (VE), respiratory frequency (fR), oxygen saturation (SpO2), 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 V̇O2 (–52% ± 14%), VE (–47% ± 16%), fR (–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 patie nts 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 pa...
Source: Applied Physiology, Nutrition, and Metabolism - Category: Physiology Authors: Source Type: research