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Lecture 6

KIN 427 Lecture 6.docx

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University of Waterloo
KIN 427
Stuart Mc Gill

KIN 427 Lecture 6- January 24, 2013 Quantified activities from chapter 4: exercises walking sitting etc etc. -- - look at charts and match exercises to people's tolerance - extensor exercise→ best is to get belly off the floor so they have control over posture of spine and not hyper extending (bird dog is 1/2 the load of superman exercise) walking speed: speed-mall strolling vs. fast walking - hitch hike - swing at shoulders→ fascia→ elasticity is stimulated→ stretch elastic and it springs back to opposite glut (like german soldiers) - walking slowly is more stressful on back→ therefore there are benefits of walkign faster - walking→ role of swinging arms to reduce joint load Lumar spine posture- should and can it be modified?--> scannell and mcgill→ can physical therapist change someones' spine mechanics -posture refers to the lumbar spine position in relaxed standing - every position has elastic equilibrium→ completely unloaded→ therfore want to find that elastic equilibrium positions for rehab - spine neutral zone happens to be in slight standing extension - hypolordosis= sit more in the greatest elastic stress - hyper= stand in elastic stretch -manual therapy approaches can change posture→ physical exercise can help! Other mechanisms Intra-abdominal pressure - we close glottis → creates hydrolic jack to unload spine→ larger belly can help spine into extension -but blood pressure sky rockets→ pop vessels etc. - can't build up intra-abdominal pressure if you don't have muscles there! - turns out that considered the muscles, it actually increase flexion! - but it does help with spine stiffness - intra-abdominal pressure didn't solve but it added to how we understand - it doesn't help bear more load but it help it become more robust to bear load summary: there is no magical mechanisms- simply understand biomechanics , functional anatomy, motor control and physiology (good kinesiology!) section summary: - when do ligaments become loaded? - think about how to avoid injury (avoid deviated postures) Chapter 1 - convex side is the tensile side, concave side is the compressed side - older adults more weak in tensile side and young children are more weak in compressive side (buckling fracture - failure graph ligament failure- load rate dependency - if you load ligament slowly→ avulsion→ the actually bone breaks (liklihood of slow loading breaks ligament is unl
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