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Effects of acceleration in the Gz axis on human cardiopulmonary responses to exercise

Bonjour, Julien ; Bringard, Aurélien ; Antonutto, Guglielmo ; Capelli, Carlo ; Linnarsson, Dag ; Pendergast, David ; Ferretti, Guido

In: European Journal of Applied Physiology, 2011, vol. 111, no. 12, p. 2907-2917

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    Titre
    • Effects of acceleration in the Gz axis on human cardiopulmonary responses to exercise
    Auteur
    • Bonjour, Julien. Département de Neurosciences Fondamentales, Université de Genève, Rue Michel Servet 1, 1211, Geneve 4, Switzerland
    • Bringard, Aurélien. Département de Neurosciences Fondamentales, Université de Genève, Rue Michel Servet 1, 1211, Geneve 4, Switzerland
    • Antonutto, Guglielmo. Dipartimento di Scienze e Tecnologie Biomediche, Università di Udine, Udine, Italy
    • Capelli, Carlo. Dipartimento di Scienze Neurologiche e della Visione, Facoltà di Scienze Motorie, Università di Verona, Verona, Italy
    • Linnarsson, Dag. Department of Physiology and Pharmacology, Karolinska Institute, Stockholm, Sweden
    • Pendergast, David. Center for Research in Special Environments, State University of New York, Buffalo, NY, USA
    • Ferretti, Guido. Département de Neurosciences Fondamentales, Université de Genève, Rue Michel Servet 1, 1211, Geneve 4, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • European Journal of Applied Physiology, 2011, vol. 111, no. 12, p. 2907-2917. Springer-Verlag
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:313835
    Summary
    The aim of this paper was to develop a model from experimental data allowing a prediction of the cardiopulmonary responses to steady-state submaximal exercise in varying gravitational environments, with acceleration in the Gz axis (a g) ranging from 0 to 3g. To this aim, we combined data from three different experiments, carried out at Buffalo, at Stockholm and inside the Mir Station. Oxygen consumption, as expected, increased linearly with a g. In contrast, heart rate increased non-linearly with a g, whereas stroke volume decreased non-linearly: both were described by quadratic functions. Thus, the relationship between cardiac output and a g was described by a fourth power regression equation. Mean arterial pressure increased with a g non linearly, a relation that we interpolated again with a quadratic function. Thus, total peripheral resistance varied linearly with a g. These data led to predict that maximal oxygen consumption would decrease drastically as a g is increased. Maximal oxygen consumption would become equal to resting oxygen consumption when a g is around 4.5g, thus indicating the practical impossibility for humans to stay and work on the biggest Planets of the Solar System