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Related Experiment Videos

Exercise after acute hyperbaric oxygenation: is there an ergogenic effect?

A L Webster1, D G Syrotuik, G J Bell

  • 1Faculty of Physical Education and Recreation, University of Alberta, Canada.

Undersea & Hyperbaric Medicine : Journal of the Undersea and Hyperbaric Medical Society, Inc
|October 28, 1998
PubMed
Summary
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One hour of 100% oxygen at 2.0 atm abs (hyperbaric oxygen therapy) did not improve maximal oxygen consumption (VO2max) or exercise performance. Muscle oxygenation showed minor changes, indicating no significant ergogenic effect.

Area of Science:

  • Exercise Physiology
  • Hyperbaric Medicine
  • Sports Science

Background:

  • Hyperbaric oxygen therapy (HBOT) involves breathing pure oxygen at increased atmospheric pressure.
  • The potential ergogenic effects of HBOT on exercise performance are not fully understood.
  • Previous research has yielded mixed results regarding HBOT's impact on physiological responses during exercise.

Purpose of the Study:

  • To investigate the impact of a 1-hour exposure to 100% oxygen at 2.0 atm abs on subsequent exercise performance.
  • To assess the effects of HBOT on maximal oxygen consumption (VO2max), ventilation threshold (VT), and lactate threshold (LT).
  • To evaluate changes in muscle oxygenation (%Mox) during incremental exercise following HBOT.

Main Methods:

  • Participants underwent two baseline incremental cycle ergometer tests (T1, T2).

Related Experiment Videos

  • A third test (T3-HBO2) was performed after a 1-hour exposure to 100% oxygen at 2.0 atm abs.
  • Near-infrared spectroscopy (NIRS) monitored vastus lateralis muscle oxygenation during T2 and T3-HBO2.

    • Main Results:

    • No significant differences were found in VO2max, VT, or LT between baseline tests and the test post-HBOT.
    • Muscle oxygenation (%Mox) showed no significant difference between T2 and T3-HBO2, except at 235 W where it was elevated post-HBOT.
    • The observed elevation in muscle oxygenation at 235 W did not translate to improved overall exercise performance.

    Conclusions:

    • A 1-hour exposure to 100% oxygen at 2.0 atm abs does not provide an ergogenic benefit for subsequent incremental exercise performance.
    • HBOT did not significantly enhance key physiological markers of exercise capacity like VO2max, VT, or LT.
    • While minor changes in muscle oxygenation were noted, they did not lead to performance improvements, suggesting limited utility of this HBOT protocol for enhancing exercise capacity.