Motor Control Lecture 10_Student Version.pptx

Motor Control Lecture 10_Student Version.pptx - Motor...

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Motor Control and Learning Lecture #10 Control of Posture Jessica Rodriguez, MS
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Posture “A composite of the positions of all the joints of the body at any given time” Standing (most information) Seated Lying
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Standing Posture Ideal posture: Stable, maintains the body’s mass over its base of support The body is designed to stand with very little _muscular effort_ Minimizes stress and strain on tissue Statically Dynamically
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How Do We Control Posture? Automatic Responses Responses are typical, but can be ___adapted__________ Short latency( small of time to proses the information) Involve more complex neural circuits Multiple input – multiple output relationships Postural adjustments are automatic responses Not hard-wired, but __pre-programmed_____ Can be re-shaped or re-programmed
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What is Postural Control? Three distinct aspects: Postural orientation Purposely position the body in a certain way to perform a task Postural equilibrium Maintain balance Anticipatory postural adjustments Pre-emptive corrections to posture to correct for voluntary movement of limbs
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Postural Orientation Purposefully positioning body to accomplish a task Provide stability for arm or leg movement Keep _head steady__while performing a task Consider a football receiver running and tracking a ball thrown to them Complex task – consider involvement of biarticular muscles Hold upper arm horizontal, flex and extend elbow
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Postural Equilibrium Maintain balance Equilibrium means keeping weight vector within base of support Typical base of support = ___1ft^2___ Stability means we are either at equilibrium or can use muscle activity to return to equilibrium
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Inverted Pendulum Think of center of pressure as the apex of a cone: If your center of gravity travels outside of the cone, you will fall
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Postural Limits of Stability
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