Journal
RESPIRATORY PHYSIOLOGY & NEUROBIOLOGY
Volume 276, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.resp.2020.103414
Keywords
COPD; Eccentric exercise; Pulmonary rehabilitation; Exercise training; Muscle strength
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Funding
- Research Institute of the McGill University Health Centre
- Foundation of the Montreal Chest Institute
- Edith Strauss Rehabilitation Research
- Canadian Institutes of Health Research (CIHR) Systematic Biology Training
- Chercheurs-Boursiers Junior 1
- Fonds de Recherche du Quebec-Sante
- William Dawson Research Scholars Award
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Objectives: To compare eccentric (ECC) and conventional concentric (CON) cycle training on quadriceps muscle strength in advanced COPD. Secondary objective was to assess functional capacity. Methods: A parallel-group, assessor-blind, randomized trial was conducted. Severe COPD patients were randomized to either an ECC (n = 13) or CON (n = 11) cycling program for 30-min, 3 times/week for 10 weeks. ECC group trained at similar to 4-fold higher power than the CON group at similar relative heart rate intensity. Results: Isometric and isokinetic quadriceps peak torque improved after ECC but not CON; between group difference was significant for isometric peak muscle force (p < 0.05). Peak cycling power and endurance time increased in both groups (p < 0.05). Dyspnea at peak cycling power improved only after ECC training (p < 0.05). Sensory intensity ratings of dyspnea and leg fatigue were significantly lower (p< 0.05) during ECC compared with CON at equivalent relative heart rate intensities. Conclusions: ECC could be an effective alternative and/or adjunct modality to pulmonary rehabilitation in severely ventilatory limited COPD patients.
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