lifespan notes 4 - Module13Chapter12 Gait Motordevelopment...

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Module 13 – Chapter 12  Gait  Complex locomotor skils  Motor development  Reflexive (B-2wk) Preadapted (2wk-1yr) Fundamental Patterns (1-7 yrs)  Context specific (7-11yrs)  Skillful (11+yrs)  Locomotor skill development  Walk – continuous flex’n & extens’n with at least 1 foot always in contact with ground  Run – continuous cycle of flex-ext 50-50 phasing, airborne phase  Jump –take- off 2 feet land on 2 feet  Gallop –forward step, then chased (run) off by lagging leg  Hop – continuous jumping cycle on one leg  Leap –take off from 1 foot on other with length longer than run  Skip – step the hop, use alternate lead leg  Slide – side step, then pushed aside by lagging leg  Walking or gait- unique among locomotor skills  Do behaviors emerge in SET order?  Dynamical systems theory says : no  Premise is skill develops when necessarily mediums exist not a script  Organism constraint (cant handle speed or weight… ) 
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Environment  Task  What is the weakest link… Weight speed force balance  As shaped by OET  Philippson Step (Gait) Cycle  Heel strike to next heel strike on same leg (continous stepping already achieved)  Mid-stance: weight seems to be transferred  Pushoff: where you push off the ground  with other foot  Stance phase 60-602% heel strike, mid stance, to push off begins   Toe off swing start: leaves the ground it begins to swing  Swing ends: foot stops swing then…  Heel stikes  Swing phase 38-40%- from pushoff ends to heel strikes again   Between stance and swing is double support double knee lock  Adult pattern of walking  Legs/feet:  Foot contact: heel strike, heel-toe  Dynamic base: straight ft placement  Step-width: narrow  Knee action  Loading @ground contact: double-support, double knee lock  Weight transfer: flexion absorbs impact  Knee-extension: initiates push off 
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