BioProc2/3

1. BioProc2/3 Analog data processing Part Three Impact, Work and Force Analysis Techniques

2. Introduction • Download bpwin2.zip or bpwin2.exe from CSB website • http://www.csb-scb.com go to Software and then to BioProc2 • http://www.health.uottawa.ca/biomech/csb/Software/bioproc2.htm • installs all necessary device drivers • only needs to be done once • to get latest version use the Update from Internet item in the Help menu Gait & Biomechanics Laboratory, University of Ottawa

3. Force transducer calibration • use Pearson Correlation from Correlation menu • (new) after correlation and regression coefficients are computed you are prompted to apply one of the regression equations to the original data • use Scaling menu from Analysis menu to scale data to any units Gait & Biomechanics Laboratory, University of Ottawa

4. Force platform analyses • use submenu Analyze Force Plate Data from Analysis menu • two plates can be combined (Combine Two Plates) • impulse computed (from integration statistics) • changes in centres of gravity estimated (Centre of Gravity) Gait & Biomechanics Laboratory, University of Ottawa

5. Centre of mass calculations • requires subject to have static initial conditions • can compute takeoff velocity, height after takeoff, lowest and highest positions during period of stance for all three directions, work done and jumping power • (new) high-pass filtering reduces drift Gait & Biomechanics Laboratory, University of Ottawa

6. Angular Impulse • use Work or Angular Impulse Analysis from Integration Statics submenu of Analysis menu • requires data file that contains moments (from Vicon or Visual3D ASCII export) • moments must be in the first half of the data file, second half may contain powers Gait & Biomechanics Laboratory, University of Ottawa

7. External, Internal and Total Work • use Work or Angular Impulse Analysis from Integration Statics submenu of Analysis menu • requires data file that contains moment powers (from Vicon or Visual3D ASCII export) • powers must be in first half or all of the data file • average work, sum of positive and negative work and external, internal and total mechanical work done are computed for each axis • sums for each axis and total for all axes are also computed • calculates percent contributions for each moment Gait & Biomechanics Laboratory, University of Ottawa

8. Moment Power Analysis (Work Bursts) • use Moment Power Analysis from Integration Statics submenu of Analysis menu • requires data file that contains moment powers (from Vicon or Visual3D ASCII export) • computes work bursts and peak moments and powers whenever power changes from positive to negative or moment changes from positive to negative • set a threshold to eliminate small bursts of power Gait & Biomechanics Laboratory, University of Ottawa

9. Impact (GSI and HIC) Analyses • use GSI and HIC (Impacts) from Integration Statics submenu of Analysis menu • needs one channel of acceleration data scaled to g’s or m/s2 • second channel may contain triggering information (no longer used) • computes Gadd Severity Index for head impacts only (i.e., uses a2.5) • (new) average acceleration, A-3 and HIC, integral, delta g and time to peak acceleration • HIC is only done for the maximum allowable time interval Gait & Biomechanics Laboratory, University of Ottawa