# UMass Amherst KIN 430 - BiomechLabB (2 pages)

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## BiomechLabB

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## BiomechLabB

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Pages:
2
School:
University of Massachusetts Amherst
Course:
Kin 430 - Biomechanics
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Biomechanics Laboratory B Linear Kinematics Introduction The purpose of this laboratory is to demonstrate the relationships between linear position displacement and velocity during steady state human locomotion Using the linear position of a marker placed close to the whole body center of mass the displacement and velocity and acceleration can be computed and analyzed Finite difference formulas First Central Difference Method and Forward and Backward Difference Methods will be used to calculate the velocity values Methods Subjects Some students will be asked to run and walk through the motion capture field with a reflective marker placed on the sacrum Several trials will be performed covering a range of speeds Equipment Qualysis motion analysis system Procedures The participants will be asked to walk and run across the force platform in the center of the lab which will assure that the participant s movements are captured by the motion analysis system The participants will attempt to maintain a steady speed while passing through the field of view of the cameras The digital video cameras will record the motion at 240 Hz 240 samples per section The Qualysis system will automatically determine the three dimensional position of the sacral marker throughout the capture volume For this lab we will assume that the marker on the sacrum provides a good estimate of the motion of the center of mass a reasonable assumption Following the lab the data for a complete stride of walking and a complete stride of running will be posted to the class blog in MS Excel format The CM positional data can be differentiated to produce an estimate of the instantaneous velocity over the full stride This will require three formulas 1 First Central Difference Method vi xi 1 xi 1 2 t 2 Forward Difference Method v1 x2 x1 t 3 Backward Difference Method vn xn xn 1 t vi velocity at time i xi 1 position at time i 1 xi 1 position at time i 1 t change in time time interval n number of data points

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