Scientific article
Open access

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

Published inEuropean journal of applied physiology, vol. 111, no. 12, p. 2907-2917
  • Open Access - Licence nationale Springer
Publication date2011

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 G(z) axis (a (g)) ranging from 0 to 3 g. 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 4.5 g, thus indicating the practical impossibility for humans to stay and work on the biggest Planets of the Solar System.

  • Acceleration
  • Adult
  • Astronauts
  • Blood Pressure/physiology
  • Cardiac Output/physiology
  • Exercise/physiology
  • Exercise Test/methods
  • Gravitation
  • Heart/physiology
  • Heart Rate/physiology
  • Humans
  • Lung/physiology
  • Male
  • Oxygen Consumption/physiology
  • Space Flight
  • Stroke Volume/physiology
Citation (ISO format)
BONJOUR, Julien et al. Effects of acceleration in the Gz axis on human cardiopulmonary responses to exercise. In: European journal of applied physiology, 2011, vol. 111, n° 12, p. 2907–2917. doi: 10.1007/s00421-011-1917-0
Main files (1)
Article (Published version)
ISSN of the journal1439-6319

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