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Visual3D

Visual3D. Inverse Dynamics and Joint Power Analysis. Marker and Force Data. marker data come in a .C3D file created by Vicon, Motion Analysis, Qualysis or similar motion capture system SIMI and APAS may also be used but data must be placed in a ASCII (.FSV) file by, for example, BioProc2/3

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Visual3D

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  1. Visual3D Inverse Dynamics and Joint Power Analysis

  2. Marker and Force Data • marker data come in a .C3D file created by Vicon, Motion Analysis, Qualysis or similar motion capture system • SIMI and APAS may also be used but data must be placed in a ASCII (.FSV) file by, for example, BioProc2/3 • force data come with the .C3D file but may also be collected and placed in an ASCII (.FSV) file by BioProc2/3 • data may be streamed directly to Visual3D using newest version of Visual3D and compatible motion capture system, e.g., Nexus Biomechanics Laboratory, School of Human Kinetics

  3. Creating the Model • first a static trial is loaded to create the model (you can use a movement trial) • a previous model may be used for a similar marker set • model is customized for each participant (mass and height etc.) • ideally markers are located at each joint but these markers do not have to be included in the movement (dynamic) trials • should save the model file (.MDH) separately for use with other trials or experimental conditions of the same person • new models must be created for each new marker set • modeling is done using graphical user interface (GUI) Biomechanics Laboratory, School of Human Kinetics

  4. create segments create landmarks enter body mass and height Model Building Screen Biomechanics Laboratory, School of Human Kinetics

  5. Movement Trials • one or more movement trials may be loaded into same workspace (.CMO), essential if trials are to be averaged • model is applied to each trial • trial may be viewed with bones or geometrical solids for each segment • ground reaction forces should be checked • errors in force platform locations and parameters may be checked and changed in necessary Biomechanics Laboratory, School of Human Kinetics

  6. static trials movement trials tags to identify experimental conditions Workspace Screen Biomechanics Laboratory, School of Human Kinetics

  7. Event Labeling • if events were not created by motion capture software they can be added automatically (via a pipeline) or manually with Visual3D • special events used for reports can also be added • e.g., Begin, End, Impact • events may be checked for accuracy using GUI Biomechanics Laboratory, School of Human Kinetics

  8. signals and events tab edit events signal tree body at current event signal histories with events marked Signal and Event Processing Screen Biomechanics Laboratory, School of Human Kinetics

  9. Data Processing Pipeline • a pipeline may be applied to process the data for inverse dynamics, energy or moment power analyses • a script may be used to perform these operations • a typical script (.V3S) includes interpolation and data filtering • special forces may be added such as moving force platforms or pedal forces Biomechanics Laboratory, School of Human Kinetics

  10. • commands • pipeline • options • import signals • load/save scripts Pipeline Form Biomechanics Laboratory, School of Human Kinetics

  11. Graphical Reports • reports including graphs of the various kinematics and kinetics are created last • special filters may be used to display only certain types of trials, e.g., right vs. left leg starts, barefoot vs. shod gait, loaded vs. unloaded lifts • these categories are created in the workspace area • basic reports (.RGT) may be loaded or created and saved for later repeated use graphs may be exported for presentation Biomechanics Laboratory, School of Human Kinetics

  12. contents of pages report pages graphical or tabular reports Reporting Screen Biomechanics Laboratory, School of Human Kinetics

  13. Export Data to MatLab or BioProc3 • kinematic or kinetic data may be exported in .C3D or ASCII files • BioProc3 has capability of computing total, internal and external work, angular impulses and work done by individual bursts of power • script is used to create ASCII file for BioProc3 • MatLab can compute foot clearance Biomechanics Laboratory, School of Human Kinetics

  14. BioProc3: External/Internal/Total Work • external work • internal work • total work Biomechanics Laboratory, School of Human Kinetics

  15. BioProc3: Work Done in Bursts • work done • which moment of force • peak power • peak moment • mean power • total work done Biomechanics Laboratory, School of Human Kinetics

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