KINES 300 Lecture Notes - Lecture 22: Anatomical Terms Of Motion, Ground Reaction Force, List Of Flexors Of The Human Body
22 May 2020
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Major muscles/muscle groups and types of actions during gait. Hip extensors- concentric first, then grf takes over. Post tib- early is eccentric, late is concentric. Ankle plantar flexors work less due to grf and stored. To maintain neutral foot / avoid foot drop. If grf is in front of a joint, joint will extend. If grf is behind a joint, joint will flex. Grf helps our joints to move so muscles don"t have to work as hard. Magnitude of grf = muscle force + body weight. Direction of grf = opposite force vector (gravity) Cop is application point of grf and always moved towards com. First peak = weight acceptable = loading response. Breaking force- first half of stance phase, grf moves posteriorly to stop us. Propulsive force- second half of stance phase grf moves anteriorly to move us forward. Medial-lateral direction : grf moves towards com and is always lateral to com so it moves medially.
