Fig 2. Measurement procedure for the four lower limb muscles.

LatGas, lateral gastrocnemius; MedHam, medial hamstrings; RecFem, rectus femoris; Adds, hip adductors. The red arrow indicates the direction of joint movement during stretch. Instrumentation: (1) three inertial measurement units (joint angle measurement); (2) surface electromyography (muscle activation measurement); and (3) a six degrees of freedom force/torque sensor attached to a shank or foot orthosis (torque measurement); (4) support frame. Modified from [30] with permission (S2 Fig).