title: Breathing patterns during eccentric exercise.
abstract: Eccentric (ECC) work is interesting for rehabilitation purposes because it is more efficient than concentric (CON). This study assessed respiratory patterns and electromyographic activity (EMG) during ECC and CON cycling, both at similar power outputs and VO2 in eight healthy male subjects. Measurements include ventilation (VE), tidal volume (Vt), breathing frequency (Fb), arterial blood gases, and vastus lateralis (VL) and biceps brachii (BB) EMG. At the same mechanical power, VO2 and VE were fivefold lower in ECC as was VL EMG while BB EMG, Vd/Vt, PaO2 and PaCO2, were not different between modalities. At the same VO2, there was no difference in VE but Vt was lower and Fb higher in ECC. VL EMG was not different between modalities while BB EMG was higher in ECC. The latter observation suggests that ECC cycling may result in arm bracing and restricted chest expansion. Since hyperpnea is a known trigger of exaggerated dynamic hyperinflation, the prescription of ECC cycling for patient rehabilitation requires further assessment.
authors.affiliation: Department of Sport Medicine and Functional Explorations, University-Hospital (CHU), Hôpital G. Montpied, Clermont-Ferrand, France; INRA, UMR 1019, CRNH-Auvergne, Clermont-Ferrand, France; University Clermont 1, UFR Médecine, Clermont-Ferrand, France; Department of Rehabilitation and Physical Medicine, University-Hospital (CHU), Hospital G. Montpied, Clermont-Ferrand, France; Clermont University, Blaise Pascal University, Laboratory of Metabolic Adaptations to Exercise in Physiological and Pathological Conditions (AME2P, EA 3533), CRNH Auvergne BP 10448, F-63000 Clermont-Ferrand, France.
authors.forename: J B
authors.initials: JB
authors.lastname: Lechauve
authors.affiliation: Faculty of Health Sciences, University of Ottawa, 451 Smyth Road (3028B), Ottawa, ON K1H 8M5, Canada.
authors.forename: H
authors.initials: H
authors.lastname: Perrault
authors.affiliation: Medecine Faculty, Grenoble University, France.
authors.forename: B
authors.initials: B
authors.lastname: Aguilaniu
authors.affiliation: Strasbourg University, Physical and Rehabilitation Medicine Department, Strasbourg University Institute of Rehabilitation Clémenceau, France; EA 3072 "Mitochondrie, stress oxydant et protection musculaire", Strasbourg, France.
authors.forename: M E
authors.initials: ME
authors.lastname: Isner-Horobeti
authors.affiliation: Clermont University, Blaise Pascal University, Laboratory of Metabolic Adaptations to Exercise in Physiological and Pathological Conditions (AME2P, EA 3533), CRNH Auvergne BP 10448, F-63000 Clermont-Ferrand, France.
authors.forename: V
authors.initials: V
authors.lastname: Martin
authors.affiliation: Department of Rehabilitation and Physical Medicine, University-Hospital (CHU), Hospital G. Montpied, Clermont-Ferrand, France.
authors.forename: E
authors.initials: E
authors.lastname: Coudeyre
authors.affiliation: Department of Sport Medicine and Functional Explorations, University-Hospital (CHU), Hôpital G. Montpied, Clermont-Ferrand, France; INRA, UMR 1019, CRNH-Auvergne, Clermont-Ferrand, France; University Clermont 1, UFR Médecine, Clermont-Ferrand, France. Electronic address: rrichard@chu-clermontferrand.fr.
authors.forename: R
authors.initials: R
authors.lastname: Richard
mesh_terms: D000328:Adult; D001784:Blood Gas Analysis; D004562:Electrocardiography; D004576:Electromyography; D015444:Exercise / Q000502:physiology*; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D008297:Male; D009119:Muscle Contraction / Q000502:physiology; D018482:Muscle, Skeletal / Q000502:physiology; D010101:Oxygen Consumption; D012119:Respiration; D013147:Spirometry; D055815:Young Adult
keywords: Eccentric cycling; Electromyography; Operating lung volumes; Ventilation