PHTY210 Lecture Notes - Lecture 16: Aponeurosis, Soleus Muscle, Motion Control
Document Summary
Discuss the differences between walking and running: phases of walking, running vs walking, single limb support task - no double support. "float" period: also called "flight phase, neither foot in contact with the ground, running cycle is quicker, 0. 7 sec vs walking - 1 sec, ratio of stance to swing (shorter stance phase, running stance:swing 35:65, walking stance:swing 60:40. Increased joint rom: greater impact forces, greater eccentric muscle contraction. Joint moments (5m/s: hip = 6 x greater than walking, knee = 6 x greater than walking, ankle = 2-3 x greater than walking. Increased step length: reduced step width (3cm) Iliacus activity increases in preparation for swing: diminishes as advancing body serves as a knee extensor, ankle, diminishes, "push off" largely recoil tension in aponeurosis and tendon. Stretch-shortening cycle: distribution of forces on the foot, highest pressure in area of forefoot, peak grf in mid stance - when forefoot is on the ground.
