Hyperbaric chambers provide 100% pure oxygen to the body. What are the purported benefits described?

• A. They cool the injury to reduce swelling.
• B. They replace the need for rest after injury.
• C. They help with callus formation.
• D. More oxygen diffuses to the injured area, reducing swelling and increasing blood flow and white blood cell activity, thus reducing recovery time.

Answer: (D)

The key idea is that giving 100% oxygen under pressure increases the amount of oxygen dissolved in the blood, so more oxygen can diffuse into damaged tissues. That extra oxygen supports cellular energy production and metabolism in areas where blood flow is compromised, helping the healing process. It can also help reduce swelling because high oxygen tensions can cause vasoconstriction in normal vessels, which lowers edema while the injured tissue still receives ample oxygen. Additionally, the higher oxygen availability boosts white blood cell activity, improving their ability to kill bacteria and manage inflammation. All of these factors together can shorten recovery time. The other options describe things that aren’t how hyperbaric oxygen works: cooling isn’t the mechanism here, oxygen therapy isn’t meant to replace rest, and callus formation is a bone-specific healing process not the general aim of HBOT.