Fig. 2

Absolute differences between the actual and intended repetitions in reserve (RIR) for different prescription approaches (%1RM-RTF, RTF-velocity, and RIR-velocity) at two relative loads (60%1RM and 80%1RM) and two intended RIR targets (2RIR and 4RIR). Solid horizontal lines represent the mean absolute error for each approach, and individual data points are displayed. Letters “a” and “b” indicate significant differences (p ≤ 0.05) compared to the RTF-velocity and RIR-velocity relationships, respectively