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The maximal oxygen uptake (V̇_O2,peak) during dynamic muscular exercise is commonly taken as a crucial determinant of the ability to sustain high‐intensity exercise. Considerably less attention, however, has been given to the rate at which V̇_O2 increases to attain this maximum (or to its submaximal requirement), and even less to the kinetic features of the response following exercise.

Six, healthy, male volunteers (aged 22 to 58 years), each performed 13 exercise tests: initial ramp‐incremental cycle ergometry to the limit of tolerance and subsequently, on different days, three bouts of square‐wave exercise each at moderate, heavy, very heavy and severe intensities. Pulmonary gas exchange variables were determined breath by breath throughout exercise and recovery from the continuous monitoring of respired volumes (turbine) and gas concentrations (mass spectrometer).

For moderate exercise, the …