In a 4-week trial, 24 healthy men did sprint interval training (SIT); half received one low-dose hyperbaric oxygen (HBO) session immediately after each workout, the others did SIT alone. Both groups improved aerobic fitness and lost fat, but the SIT+HBO group gained significantly more anaerobic power—higher peak and mean sprint power relative to body weight. There were no clear added benefits for aerobic capacity, sleep quality, or heart-rate recovery. The study is small, so bigger controlled trials are needed to confirm these findings and figure out how HBO adds to sprint training <view study>