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Answer Wiki. As John suggests, divers that ascend too quickly can get an air embolism. Bends (decompression sickness) is slightly different and requires a diver to have been at some depth breathing a nitrogen mixture for some time. You can get an embolism even if you havenât been down long enough to need decompression stops.
Under stressful racing conditions elite swimmers may have a preferred side to breathe and as they swim sub 60 seconds per 100m may need the extra oxygen too. But they are not stuck with single-sided breathing in training as this would cause their stroke to deteriorate. Our advice: Make sure you're not either.