Fig. 6From: The comfort and safety of a novel rolling mechanical indentation device for the measurement of lumbar trunk stiffness in young adults a Force Displacement Curve. Typical force-displacement curves for levels L5, L3 and L1 (Participant #43). b Calculation of Terminal Stiffness. Terminal stiffness is calculated by dividing the maximum applied force (F) by the maximal displacement (D)Back to article page