Does hyperbaric oxygen exposure affect high-intensity, short-duration exercise performance?

Area of Science:

• Sports Medicine
• Physiology
• Hyperbaric Medicine

Background:

• Hyperbaric oxygen (HBO) therapy involves breathing pure oxygen at elevated pressures.
• This increases plasma oxygen content, potentially affecting physiological responses during exercise.
• The impact of acute HBO on high-intensity exercise performance remains unclear.

Purpose of the Study:

• To investigate the effects of acute hyperbaric oxygen exposure on physiological responses.
• To determine the impact of acute HBO on maximal lower and upper extremity exercise performance.
• To assess performance in short-term, high-intensity exercise following HBO exposure.

Main Methods:

• Two double-blinded, randomized experiments were conducted.
• Experiment 1: 9 subjects performed maximal treadmill running for 1-2 minutes.
• Experiment 2: 9 different subjects performed maximal repetitive bench presses for 1-2 minutes.
• Subjects received either 1-hour HBO (100% O2 at 2.0 ATA) or sham exposure (ambient air at 1.2 ATA) before exercise.

Main Results:

• No significant differences were found in postexercise blood lactate concentrations.
• Peak heart rate and ratings of perceived exertion were not significantly affected.
• Performance metrics, including treadmill running time and number of bench press lifts, showed no significant changes.
• Acute HBO exposure did not alter key physiological markers or performance outcomes.

Conclusions:

• Acute hyperbaric oxygen exposure does not appear to enhance physiological responses or performance.
• High-intensity exercise performance (running, lifting) was unaffected by pre-exercise HBO.
• Unlike other oxygen-increasing methods, acute HBO shows no significant benefit for subsequent intense physical activity.