The Motion Analysis Corp. lifting analysis application measures the critical biomechanical parameters when lifting an object like a box. It supplies a complete kinematic report and comparison measures. The information can be used to compare the technique and power generation among people and to changes over time. This guide will step through the procedures to operate LiftTrak and generate the computations and reports.
What you need
Motion Analysis Corp. Motion Capture system. 39 Retroreflective Markers and configured as shown below:
|1||T1||On top of the spinious process of the first thoracic vertebra.|
|2||L.C7||1cm to the left of the C7 vertebra.|
|3||R.C7||1cm to the right of the C7 vertebra.|
|4||T10||On top of the spinious process of the 10th thoracic vertebra.|
|5||L.T9||1cm to the left of the spinious process of the T9 vertebra.|
|6||R.T9||1cm to the right of the spinious process of the T9 vertebra.|
|7||L2||On top of the spinious process of the 2nd lumbar vertebra.|
|8||L.L1||1cm to the left of the spinious process of the L1 vertebra.|
|9||R.L2||1cm to the right of the spinious process of the L1 vertebra.|
|10||L5||On top of the spinious process of the 5th lumbar vertebra.|
|11||L.L4||1cm to the left of the spinious process of the L4 vertebra.|
|12||R.L5||1cm to the right of the spinious process of the L4 vertebra.|
|13||R.Shoulder||End of the Clavicle (collar bone) - top of shoulder|
|14||R.Elbow||Lateral epicondyle of the humerus. Outside of elbow.|
|15||R.Elbow.Med||Medial epicondyle of the humerus. Inside of elbow.|
|16||R.Wrist||Styloid Process of the Ulna. Wrist on fingerside.|
|17||L.Shoulder||End of the Clavicle - top of shoulder|
|18||L.Elbow||Lateral epicondyle of the humerus|
|19||L.Elbow.Med||Medial epicondyle of the humerus|
|20||L.Wrist||Styloid Process of the ulna|
|21||R.ASIS||Over the right front of the hip|
|22||L.ASIS||Over the left front of the hip|
|23||L.PSIS||Over the most posterior potrusion of the right portion of the pelvis.|
|24||L.PSIS||Over the most posterior potrusion of the left portion of the pelvis.|
|25||R.Thigh||About 1/3 the distance from hip joint to knee joint|
|26||R.Knee||On the Lateral Condyle|
|27||R.Shank||About 1/3 the distance from knee joint to ankle joint|
|28||R.Ankle||On the Lateral Malleolus|
|29||R.Heel||Centered on the heel|
|30||R.Toe||Over the base of the second toe|
|31||L.Thigh||About 2/3 the distance from hip joint to knee joint|
|32||L.Knee||On the Lateral Condyle|
|33||L.Shank||About 2/3 the distance from knee joint to ankle joint|
|34||L.Ankle||On the Lateral Malleolus|
|35||L.Heel||Centered on the heel|
|36||L.Toe||Over the base of the second toe|
Data Collection Setup
Data collection for LiftTrak is similar to most standard collections. There are some settings for calibration and data collection that you should use that will help ease the process. Learn about the recommended data collection settings in Data Collection Setup.
You should already be familiar with how to collect 3D data using Cortex. However, LiftTrak requires some specific collection procedures to ensure correct calculations. Trial Collection describes the recommended workflow to collect your trials.
Running the LiftTrak Application
Now that the trials are collected, data are clean and events selected, you can use the LiftTrak Application to perform the calculations and generate the reports. Click to watch the Video Tutorial on how to use the LiftTrak Application:
To run LiftTrak, Click Applications>LiftTrak Complete the Subject Information fields for the lifter: Now Select the Trials that you want to process with LiftTrak, and click on the Generate Reports button. The Kinematics graphs will be populated for the last selected trial. Check that the graphs are filled and do not have errors. If you want, you can print out these reports by right clicking in the presentation graphs pane and selecting File>Print Graph Image. Open the MS Excel program and select the trial that you want to view. The Excel workbook will have three tabs. A listing of the data will be on the first tab, with the Graphs and WebReport on the other tabs. Here is an example report in Excel:
A green check box and a red check box will indicate within or outside normative ranges.
Cole, M. H., & Grimshaw, P. N. (2005). Compressive loads on the lumbar spine during lifting: 4D WATBAK versus inverse dynamics calculations. Applied Bionics and Biomechanics, 2(3-4), 149-160.
Faber, G. S., Kingma, I., & van Dieen, J. H. (2010). Bottom-up estimation of joint moments during manual lifting using orientation sensors instead of position sensors. Journal of Biomechanics, 43(7), 1432-1436.
Milosavljevic, S., Pal, P., Bain, D., & Johnson, G. (2008). Kinematic and temporal interactions of the lumbar spine and hip during trunk extension in healthy male subjects. European Spine Journal, 17(1), 122-128.
Plamondon, A., Gagnon, M., & Desjardins, P. (1996). Validation of two 3-D segment models to calculate the net reaction forces and moments at the L5/S1 joint in lifting. Clinical Biomechanics, 11(2), 101-110.
Potvin, J. R., & Bent, L. R. (1997). NIOSH equation horizontal distances associated with the Liberty Mutual (Snook) lifting table box widths. Ergonomics, 40(6), 650-655.
Preuss, R. A., & Popovic, M. R. (2010). Three-dimensional spine kinematics during multidirectional, target-directed trunk movement in sitting. Journal of Electromyography and Kinesiology, 20(5), 823-832.