Related Experiment Video
Updated: Jul 7, 2026

Supramaximal Intensity Hypoxic Exercise and Vascular Function Assessment in Mice
Published on: March 15, 2019
Effects of pre-exposure to hyperbaric hyperoxia on high-intensity exercise performance
Shigeo Kawada1, Kohei Fukaya, Masaru Ohtani
1The Department of Human and Engineered Environmental Studies, Graduate School of Frontier Sciences, The University of Tokyo, Chiba Prefecture, Japan. kawada@k.u-tokyo.ac.jp
Hyperbaric hyperoxia (HBO) exposure did not damage DNA or improve exercise performance. Athletes should avoid breathing high-concentration oxygen before competitions, as it may hinder maximal muscle strength and performance.
Area of Science:
- Sports Medicine
- Physiology
- Biochemistry
Background:
- Hyperbaric hyperoxia (HBO) involves breathing 100% oxygen at increased pressure.
- Concerns exist regarding HBO's effects on DNA oxidative damage and athletic performance.
- Understanding these effects is crucial for athlete safety and optimizing training.
Purpose of the Study:
- To determine DNA oxidative damage from HBO exposure.
- To evaluate if HBO pre-exposure enhances high-intensity exercise performance.
- To assess the impact of HBO on muscle fatigue and physiological markers.
Main Methods:
- Healthy subjects underwent HBO exposure (100% O2 at 1.3 ATA for 50 min).
- Urinary 8-hydroxy-2'-deoxyguanosine (8-OHdG) measured DNA damage.
- Maximal isometric knee extensor exercise assessed performance with/without HBO pre-exposure.
Main Results:
- HBO exposure did not significantly alter urinary 8-OHdG levels.
- Isometric knee extensor torque was significantly lower after HBO pre-exposure.
- Lower torque correlated with reduced electromyography and increased muscle ischemia-reperfusion.
Conclusions:
- HBO exposure is safe for DNA and does not enhance high-intensity exercise performance.
- HBO pre-exposure may impair maximal muscle strength and performance in athletes.
- Athletes should avoid pre-competition high-concentration oxygen intake to prevent performance decrements.
Related Concept Videos
Hyperpnea and Hyperventilation
Exercise and Cardiovascular Response
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...
Oxygen Transport in the Blood
Hypoxia
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
Treatment for Pulmonary Arterial Hypertension: Oxygen Therapy for Respiratory Failure
Oxygen therapy is vital in increasing and maintaining blood oxygen levels in PAH patients. As a result, it aids in reducing fatigue, improving...
Exercise and Cardiac Output
Sustained exercise increases the muscles' oxygen demand, which can be met...