Fig. 1

Schema showing the concept of rightward shift of V-slope (RtShift) and the determination of ventilatory anaerobic threshold (VAT) based on RtShift. At the outset of exercise, V-slope B shifts rightward to varying degrees (Str, slope transient) before it becomes stable in a line parallel to the R = 1 line (S1). At VAT, the V-slope deflects upward to continue its ascent (S2). V-slope A is shown as a control without any RtShift. The distance (b–a) is the rightward shift of V-slope. When adjustment is made for the initial resting shift, the distance (c–a) is subtracted