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Increased working capacity with hyperoxia in humans.

J Plet1, P K Pedersen, F B Jensen

  • 1Institute of Physical Education, Odense University, Denmark.

European Journal of Applied Physiology and Occupational Physiology
|January 1, 1992
PubMed
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Breathing enriched oxygen (hyperoxia) significantly improved endurance performance and maximal oxygen uptake (VO2max) in women, but not men. Hyperoxia reduced exercise intensity and metabolic acidosis, enhancing endurance time.

Area of Science:

  • Exercise Physiology
  • Sports Science
  • Human Performance

Background:

  • Maximal oxygen uptake (VO2max) is a key indicator of aerobic fitness.
  • Understanding factors influencing endurance performance is crucial for athletes and researchers.
  • The effects of breathing enriched oxygen mixtures on physiological responses during exercise are not fully elucidated.

Purpose of the Study:

  • To investigate the impact of breathing 55% oxygen (hyperoxia) versus normal air (normoxia) on maximal oxygen uptake (VO2max).
  • To assess the influence of hyperoxia on submaximal endurance performance and physiological responses during cycling exercise.

Main Methods:

  • Six young women and five men performed cycle-ergometer tests under normoxic and hyperoxic conditions.
  • Measurements included maximal oxygen uptake (VO2max), maximal heart rate, endurance time to exhaustion, oxygen uptake, respiratory quotient, pulmonary ventilation (VE), and blood lactate concentration.

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  • Exercise was performed at 80% of normoxic VO2max for endurance testing.

    • Main Results:

    • Hyperoxia significantly increased VO2max by 12% in women (P < 0.01) and maximal heart rate, but not in men.
    • Endurance time to exhaustion was 41% longer in hyperoxia compared to normoxia (P < 0.025) for both sexes.
    • Hyperoxia led to lower pulmonary ventilation (VE) and blood lactate concentration, especially later in the exercise, and a more efficient ventilatory compensation for metabolic acidosis.

    Conclusions:

    • Breathing enriched oxygen enhances endurance performance and maximal oxygen uptake, particularly in women.
    • Reduced ventilatory demand and metabolic acidosis under hyperoxia contribute to improved endurance.
    • Significant individual variations suggest other contributing mechanisms beyond those measured.