Figure 5. Simple logarithmic regression analysis between the Aquatic Cycling Rating of Perceived Exertion and some of the different physiological variables along all the maximum load incremental test. VO₂: oxygen uptake taking in account bodyweight (ml/kg/min); VE: pulmonary ventilation (L/min); Heart rate (beats per minute); Blood lactate (mM); Aquatic Cycling Scale RPE: overall body rating perceived exertion from the Aquatic Cycling Scale.