Special Needs to Prescribe Exercise Intensity for Scientific Studies
Figure 4
Schematic representation of first- and second- turn points of selected variables (La blood lactate concentration; VE: ventilation; VE/VO2: equivalent for oxygen uptake; VE/VCO2: equivalent for carbon dioxide output; HR: heart rate; : breathing frequency) and distinct phases (Ph 1–3) of energy supply determined from young healthy male subjects. Ph 1: no increase of blood lactate concentration above baseline during constant load exercise. Ph 2: increased but steady state blood lactate concentration during constant load exercise. Ph 3: continuous increase of blood lactate concentration during constant load exercise leading to early termination of exercise.