10-13-09 GAIT

10-13-09 GAIT - Cadence The number of steps per unit of...

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Cadence
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The number of steps per unit of time Usually expressed as the number of steps per minute Average cadence is 110-120 steps per minute Actual cadence may vary and is often decreased in patients
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Displacement of the Center of Gravity
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Vertical Displacement Approximately two inches – up and down in total Highest point – single limb support – single weight bearing on L leg, COG goes to L Lowest point – double support Lateral Displacement Approximately two inches Follows the weight bearing extremity 3 dimensional – during the gait cycle the COG alternates spiraling to left and the right A patient must have adequate balance in order to tolerate displacement of the center of gravity without falling – difficulty ambulating (walking)
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Moment or Torque
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A tendency of a joint to move in a certain direction This is due to the influences of the COG and the ground reaction forces. This explains the need, in some parts of the gait cycle, to use minimal muscle contraction to achieve the desired position of the lower extremity. When we study the gait cycle we will refer to the moment or torque as the NM or normal moment . If you have the moment, you don’t need the muscles. If you have the same moment there is no muscle. Opposite of the moment you need the muscle
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Discrepancies
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There have been numerous studies and analyses of the gait cycle There are slight variations in ROM values For the purpose of this class we will use the ROM values in our text “Physical Rehabilitation” Chapter 10 Actual patients may ambulate with slight discrepancies in ROM. That is what makes their gait pattern unique to them. – Average person bends to 60 ° when walking; could be 45°
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Determinants of Gait
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The purpose of the determinants of gait: Energy absorption – too much weight bearing activity Conservation of energy – want to use as few muscles as possible so you can conserve (save) energy The goal is for the individual to ambulate efficiently and smoothly with the least risk of injury
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Pelvic Rotation (Horizontal Plane)
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There is right and left rotation of the pelvis on a horizontal plane of approximately 4º There is a total of 8º of horizontal pelvic rotation during the gait cycle. Like the twist
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This note was uploaded on 02/11/2010 for the course AHS 151 taught by Professor Bialstok during the Fall '09 term at Nassau CC.

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10-13-09 GAIT - Cadence The number of steps per unit of...

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