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. 2021 Jun 29;57(5):485–493. doi: 10.4085/1062-6050-0416.20

Figure 3.

Figure 3

An example of a passive-resistance torque-angle curve relationship during passive stretching. Passive stiffness was defined as the change in passive-resistance torque (ΔPRT) divided by the change in range of motion (ΔROM; ΔPRT/ΔROM) and was expressed as the slope of the torque-angle curve in the middle (STF80%) and end (STFmax) of joint ROM.