UMass Amherst KIN 430 - Biomechanics Lab B (5 pages)

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Biomechanics Lab B



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Biomechanics Lab B

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Pages:
5
School:
University of Massachusetts Amherst
Course:
Kin 430 - Biomechanics

Unformatted text preview:

Emily Weimer Biomechanics Laboratory B Linear Kinematics Introduction The purpose of this laboratory was to analyze the relationships between various kinematic variables including linear position displacement and velocity These variables were all studied during steady state human locomotion By looking at the linear position using a marker placed near the participant s body center of mass we were able to calculate and analyze the displacement velocity and acceleration We looked at the two different human locomotion patterns walking and running After obtaining the data we were able to calculate the velocity values during difference formulas including First Central Difference Method Forward Difference Method and Backward Difference Method Methods Participants placed a position marker near their center of mass presumably around the sacrum and then were asked to walk and run at their comfortable speed across the force platform Using the force platform ensured that the movements were captured by the motion analysis system Qualysis Participants were instructed to maintain a steady speed while walking or running through the camera s field of view The video cameras used in our laboratory recorded the participant s motion at 240 Hz Throughout motion the Qualysis system was able to determine the 3D position of the position marker placed on the sacrum throughout the duration of movement Following the in lab portion the data for complete stride of both walking and running was extracted We were able to differentiate this data to analyze an estimate of the instantaneous velocity over the full stride cycle for both walking and running Using the velocity data that we calculated we could then create an estimate of the instantaneous acceleration again for the full stride of both walking and running The formulas that were used were 1 First Central Difference Method v x x 2 t 2 Forward Difference Method v x x t 3 Backward Difference Method vn xn xn 1 t v velocity at time i x position at



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