KINES 300 Lecture Notes - Lecture 23: Erector Spinae Muscles, Inverted Pendulum

• School: American River College
• Department: Kinesiology
• Course: KINES 300
• Professor: Kiefer

Document Summary

Static balance: ankle, hip and stepping strategies. Ankle strategy- used when perturbation is slow, low amplitude and foot contact surface is firm and wide. Muscles recruited distal to proximal to prevent fall. Ex: perturbation pushes person backward: ta fires, then quads, then abs. Ex: perturbation pushes person forward: gastroc fires, then. Hip strategy- used when perturbation is fast, large amplitude and foot hamstrings, then erector spinae contact surface is narrow or unstable. Muscles recruited proximal to distal to prevent fall. Ex: perturbation pushes person backwards- go into hip extension. Ex: perturbation pushes person forwards- go into hip flexion. Step strategy- used to prevent a fall when perturbations are fast, large amplitude or other strategies fail. Moves bos to catch up with com. The basic unit to describe gait is a cycle or stride. Initial contact (heel contact/strike): the moment when the foot hits the ground. Push off (toe off): the moment when the foot is off the ground.