title: Dynamic stability of locomotor respiratory coupling during cycling in humans.
abstract: We explored the locomotor respiratory coupling (LRC) during a 50-min constant-load submaximal cycling exercise. A 4-week recombinant human erythropoietin (r-HuEPO) treatment improved participants' aerobic capabilities, but did not elicit significant changes in LRC. The distributions of the respiratory frequency over pedalling frequency ratios were systematically bimodal, with a preferred use of 1/3 and 1/2, and a progressive shift of the higher mode from 1/3 towards 1/2 with exercise duration. These results are interpreted in the framework of the sine circle map as the result of coordination dynamics between the physiological subsystems involved in the breathing pedalling cooperation.
authors.affiliation: Université Montpellier 1, 700, av. du Pic St Loup, 34090 Montpellier, France.
authors.forename: Sébastien
authors.initials: S
authors.lastname: Villard
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Casties
authors.forename: Denis
authors.initials: D
authors.lastname: Mottet
mesh_terms: D001642:Bicycling / Q000502:physiology*; D004921:Erythropoietin / Q000008:administration & dosage; D015444:Exercise / Q000502:physiology*; D006801:Humans; D008168:Lung / Q000502:physiology; D008297:Male; D008959:Models, Neurological; D009043:Motor Activity / Q000187:drug effects / Q000502:physiology*; D017711:Nonlinear Dynamics; D010101:Oxygen Consumption / Q000187:drug effects; D011994:Recombinant Proteins; D012119:Respiration; D013997:Time Factors
chemical_list: D011994:Recombinant Proteins; D004921:Erythropoietin