A person is performing walking gait trials across a laboratory.At heel strike the hip flexion angular velocity is 0.70 rad/s, kneeflexion angular velocity is 4.15 rad/s, and ankle plantar flexionangular velocity is -0.70 rad/s. Additionally, moment of inertia ofthe hip is 0.70 kgm², moment of inertia of the knee is0.90 kgm², and moment of inertia of the ankle is 1.00kgm². What is the sagittal plane angular momentum of thehip, knee, and ankle joints at heel strike?

• H_hip at heel strike: ____________________

• H_knee at heel strike: ___________________

• H_ankle at heel strike: __________________

Once this person transitions through the stance phase to toe off(e.g. propulsion) the hip flexion angular velocity increases to3.15 rad/s, knee flexion angular velocity is 4.95 rad/s, and ankleplantar flexion angular velocity is –8.10 rad/s. If we assume gaitvelocity is constant during the stance phase, what is the moment ofinertia of the hip (mass of femur = 8.50 kg), knee (mass of shank =2.60 kg), and ankle (mass of foot = 0.82 kg) at toe off?Furthermore, what is the radius of gyration of the hip, knee, andankle at toe off?

• I_hip at toe off: ____________________

• I_knee at toe off: ___________________

• I_ankle at toe off: __________________

• K_hip at toe off: ____________________

• K_knee at toe off: ___________________

• K_ankle at toe off: __________________