Hyperbaric Oxygen Effects on Persistent Post-concussive Symptoms

Hyperbaric oxygen (HBO2) at 1.5 ATA (active) group (hyperbaric oxygen-chamber compressed to 1.5 atmosphere absolute and breathing \>99.9% oxygen). Each participant should complete 40 sessions, one session per day, five per week over the course of 3 months.

"Sham treatment includes pressurizing the chamber to 1.2 ATA with air for 5 minutes with noise of circulating air, return the chamber to 1.0 ATA after 5-7 minutes and maintain it at that pressure for until the end of the treatment, with noise of circulating air. Internal control knobs will be concealed. Participants will be instructed to undergo intermittent ear clearing technique during the initial 5 minutes of descent"