Hamstring Claw (Supine)
Setup
1: Lie supine with ankles positioned in cuffs at level of lateral malleolus, hips at 45° flexion and knees at 15° flexion
2: Adjust housing height and subject position so the cuffs are at the level of the lateral malleolus with knee and hip angles as detailed
3: Ensure the cuff is flush with the back of the leg, providing good contact and the sensor arm is at right angles to tibia/shank
4: For light test and training forces (ie up to ~ 16kg for an 80kg subject) fixation of the pelvis will not be required. For greater forces, a strap or hip thrust bar can be used to fix the pelvis and prevent a 'bridge' type movement
Cues
1: Test unilaterally
2: Keep pelvis still and spine neutral while extending the test leg from the hip in a claw type action, maintaining the knee flexion angle
3: Extend proximal thigh to squeeze the lower calf into the cuff pad, building pressure while maintaining trunk and leg posture
4: Feel fatigue/work in the gluteals and upper hamstring
5: Build to maximum force over 5 seconds
