ISU KNR 482 - FORCE PLATFORM (6 pages)

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FORCE PLATFORM



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FORCE PLATFORM

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Lecture Notes


Pages:
6
School:
Illinois State University
Course:
Knr 482 - Advanced Biomechanics Of Human Movement
Advanced Biomechanics Of Human Movement Documents

Unformatted text preview:

ILLINOIS STATE UNIVERSITY School of Kinesiology and Recreation KNR 482 FORCE PLATFORM A force platform is an electrical instrument to measure force exerted against the platform Our force platform is interfaced to a computer to display and record force platform output The force output typically presents force on the vertical axis and time on the horizontal axis The graph is known as a forcetime curve The forces of interest to us are those exerted by the force platform back against the body These are called ground reaction forces GRFs GRFs are measured in three orthogonal directions at 90 to each other vertical Fz antero posterior Fy and medial lateral Fx The vertical force is the force exerted up on the body affecting acceleration in the vertical direction The antero posterior force curve provides information on braking and propulsion phases of the body in the anterior posterior direction The medial lateral force affects sidewards motion of the body Four variables quantifying the GRF are of interest Force magnitude force timing rate of force application and impulse Each of these variables is plausibly related to injury and each of these may directly affect the level of skill performance Force magnitude The average force applied and the size of peak forces are both of interest Average force during skill performance is a general indicator of the force to which the body is exposed Peak forces reflect the maximum loads applied during skill performance We report it in N kg Force scaled to mass Force timing is important as this variable reflects coordination of the skill and it also represents how much time the body has to adjust to an imposed load Measured in seconds Rate of force application reflects the interaction of the above factors Rate of force application often referred to as loading rate is measured as the slope of the force time curve Frequently loading rate is measured during the rise of the GRF curve to a peak value Measured in BW s Impulse represents the



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