The influence of inspired oxygen on the oxygen uptake response to ramp exercise

  • Michael L. Walsh
  • Eric W. Banister
Original Article


The relation between\(\dot VO_2 \) and work rate (WR) was examined in seven male subjects who performed ramp (1 W·3 s−1) two-legged cycle ergometry to exhaustion while inspiring either hypoxic (12% O2), normoxic (21% O2), or hyperoxic (40% O2) air. The anaerobic threshold was estimated from respiratory gas exchange data and is thus referred to as the respiratory gas exchange threshold (RGET). Prior to the RGET, the\(\Delta \dot VO_2 /\Delta WR\) was greater under normoxic [mean (SD); 10. 19(1.04) ml O2·min−1·W−1] and hyperoxic [10.44 (0.72)] conditions compared with hypoxia [9.34 (0.89)]. Above the RGET, the\(\Delta \dot VO_2 /\Delta WR\) for hypoxia [8.91 (0.63)], normoxia [10.40 (0.77)], and hyperoxia [11.08 (0.48)] were all significantly different from each other. These data indicated that for two-legged, cycle, ramp ergometry in normoxia below the RGET, both the\(\Delta \dot VO_2 /\Delta WR\) and response time was constant. Above the RGET, the normoxic\(\dot VO_2 \) response was the net result of a declining\(\Delta \dot VO_2 /\Delta WR\) and a longer response time to the unsteady state character of a ramp exercise protocol.

Key words

Oxygen uptake kinetics Exercise Hypoxia Hyperoxia Efficiency 


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Copyright information

© Springer-Verlag 1995

Authors and Affiliations

  • Michael L. Walsh
    • 1
  • Eric W. Banister
    • 1
  1. 1.School of KinesiologySimon Fraser UniversityBurnabyCanada

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