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Pulmonary ⩒O2 and other gas-exchange responses during the incremental step test for a male participant. The vertical dashed line indicates VT2 occurrence and the inclined dashed line illustrates isocapnic disturbance and ventilatory compensation. The progression for this male swimmer ranged from 67 to 100%⩒O2peak, and time performance range was 265–161-s, respectively, from the first to the seventh step.
