Figure 4. Effect plot image of the relationship between physiologic variables and the Aquatic Cycling RPE along the load incremental test. VO₂: oxygen uptake taking in account bodyweight (ml/kg/min); VE: pulmonary ventilation (L/min); BL: blood lactate (mM); bpm: beats per minute; RPE: overall body rating perceived exertion from the Aquatic Cycling Scale.