Skip to main content

01.09.2009 | Original Article | Ausgabe 1/2009

European Journal of Applied Physiology 1/2009

Oxygen deficits and oxygen delivery kinetics during submaximal intensity exercise in humans after 14 days of head-down tilt-bed rest

European Journal of Applied Physiology > Ausgabe 1/2009
C. Capelli, A. Adami, G. Antonutto, M. Cautero, E. Tam


Beat-by-beat \( \dot{Q} \)aO2 and breath-by-breath \( \dot{V} \)O2 were assessed in ten male subjects (24 ± 3.5 years; 78 ± 7.7 kg; 182 ± 5.6 cm) during cycling exercise at 50 W before and after a 14-day period of head-down tilt-bed rest (HDTBR). O2 deficit (DefO2) was calculated as the difference between the volume of O2 that would have been consumed if a steady state had been immediately attained minus that actually taken up during exercise. \( \dot{Q} \)aO2 kinetics was described fitting the data with a non-linear mono-exponential model with time delay. Mean response times (MRT) of \( \dot{V} \)O2 and \( \dot{Q} \)aO2 kinetics were then calculated. DefO2 and MRT of \( \dot{V} \)O2 response did not change after HDTBR, whereas MRT of \( \dot{Q} \)aO2 kinetics increased. The invariance of \( \dot{V} \)O2 kinetics after HDTBR suggests that, although \( \dot{Q} \)aO2 response became slower after HDTBR, it did not affect the kinetics of peripheral gas exchange, which probably remained under the control of local muscular mechanisms.

Bitte loggen Sie sich ein, um Zugang zu diesem Inhalt zu erhalten

e.Med Interdisziplinär

Mit e.Med Interdisziplinär erhalten Sie Zugang zu allen CME-Fortbildungen und Premium-Inhalten der Fachzeitschriften, inklusive eines Print-Abos.

Weitere Produktempfehlungen anzeigen
Über diesen Artikel

Weitere Artikel der Ausgabe 1/2009

European Journal of Applied Physiology 1/2009Zur Ausgabe
  1. Das kostenlose Testabonnement läuft nach 14 Tagen automatisch und formlos aus. Dieses Abonnement kann nur einmal getestet werden.

Neu im Fachgebiet Arbeitsmedizin