Abstract
Abstract The effects of breathing high concentrations of oxygen on treadmill performance time, the exercise and postexercise pulse, and the relationship between excess lactic acid and oxygen debt were studied. The breathing of oxygen during the maximal performance test improved the performance time of each test. Oxygen debt was significantly reduced for the first minute of recovery after breathing oxygen during the test. The excess lactic acid was reduced after the first minute of recovery and was found to peak during the third minute of recovery. A linear relationship was observed between excess lactic acid and oxygen debt while breathing air or oxygen during the test.
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