Article (Published version) (423 Kb) - 
Limited access to UNIGE
Highlights
More informations
Home
Titles listEffects of acceleration in the Gz axis on human cardiopulmonary responses to exercise
Titles listEffects of acceleration in the Gz axis on human cardiopulmonary responses to exercise
Scientific Article
unige:25868 
 |
Effects of acceleration in the Gz axis on human cardiopulmonary responses to exercise |
|
| Authors | ||
| Published in | European Journal of Applied Physiology. 2011, vol. 111, no. 12, p. 2907-17 | |
| Abstract | 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. | |
| Keywords | 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 | |
| Identifiers | PMID: 21437604 | |
| Full text | ||
| Structures | ||
| Research group | Métabolisme énergétique (642) | |
| 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. 2907-17. https://archive-ouverte.unige.ch/unige:25868 |
195 hits 
1 download 
Contact an author
Update