Fig. 1

Evolution during the 30-min work periods of continuous and intermittent exercises of heart rate and ventilation (a), and tidal volume and breathing frequency (b). Parameters are expressed as mean and standard deviations at each minute of the tests. HR: heart rate; \( \dot{V} \)_E: ventilation; Bf: breathing frequency: VT: tidal volume. For intermittent exercise lasting one hour, only data from the 30 min of work were analyzed (recovery periods have not been taken into account into the graph). ^*Post-hoc P < 0.05 between a time-point and the previous one during a same test; ^#Post-hoc P < 0.05 between both tests at a same time-point