14 - Posture, Respiration, Swallowing

14 - Posture, Respiration, Swallowing - Kinesiology...

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Foundations of Occupation: Foundations of Occupation: Kinesiology Kinesiology Lecture 14 Lecture 14 Posture Posture Respiration Respiration Swallowing Swallowing Summer 2010 Summer 2010
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Posture Posture
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Goals for Posture Goals for Posture Control the body’s orientation in  space Maintain center of mass over  base of support through muscle  activation Stabilize the head so that one’s  gaze can be oriented  appropriately to the environment
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Posture Posture “Static” Posture: Body and segments  are aligned and  maintained in certain  positions Dynamic Posture: Body or segments are  moving
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Postural Control… Postural Control… …a person’s ability to maintain stability  of the body and segments in response  to forces that challenge or threaten to  disturb the structural equilibrium of the  body. Postural Control Postural sway Reactive responses Anticipatory responses
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Optimal” Posture Optimal” Posture “Ideal” posture results in…  optimal reduction of energy  expenditure reduction of stress on structures reduction of loads in supporting  ligaments and muscles
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Ideal  Ideal  Posture Posture (In standing) (In standing) Plumb Line  Plumb Line 
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Posture and the  Posture and the  Line of Gravity Line of Gravity Defined as the action line  of the gravitational force  on the body  Not perfectly stationary Location of LOG in  relation to axis of rotation  determines gravitational  torque
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Analysis of LOG in  Analysis of LOG in  Ideal Posture Ideal Posture Ideal posture: body segments are aligned  so that torques and stresses on body  segments are minimized Results in gravitational forces (torque)  throughout body that must be  counteracted by another force  (active/passive).
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Analysis of LOG in  Analysis of LOG in  Ideal Posture Ideal Posture Head  - LOG anterior to atlanto-occipital joint = flexion  moment Trunk  - when vertebral curves are in alignment, LOG  passes through middle  However, usually a slight flexion moment Hip  - LOG posterior to axis of rotation = ?
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