LiftTrak Operations Guide

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:

Lifttrak Marker Set
MARKERCOMMENTS
1T1On top of the spinious process of the first thoracic vertebra.
2L.C71cm to the left of the C7 vertebra.
3R.C71cm to the right of the C7 vertebra.
4T10On top of the spinious process of the 10th thoracic vertebra.
5L.T91cm to the left of the spinious process of the T9 vertebra.
6R.T91cm to the right of the spinious process of the T9 vertebra.
7L2On top of the spinious process of the 2nd lumbar vertebra.
8L.L11cm to the left of the spinious process of the L1 vertebra.
9R.L21cm to the right of the spinious process of the L1 vertebra.
10L5On top of the spinious process of the 5th lumbar vertebra.
11L.L41cm to the left of the spinious process of the L4 vertebra.
12R.L51cm to the right of the spinious process of the L4 vertebra.
13R.ShoulderEnd of the Clavicle (collar bone) - top of shoulder
14R.ElbowLateral epicondyle of the humerus. Outside of elbow.
15R.Elbow.MedMedial epicondyle of the humerus. Inside of elbow.
16R.WristStyloid Process of the Ulna. Wrist on fingerside.
17L.ShoulderEnd of the Clavicle - top of shoulder
18L.ElbowLateral epicondyle of the humerus
19L.Elbow.MedMedial epicondyle of the humerus
20L.WristStyloid Process of the ulna
21R.ASISOver the right front of the hip
22L.ASISOver the left front of the hip
23L.PSISOver the most posterior potrusion of the right portion of the pelvis.
24L.PSISOver the most posterior potrusion of the left portion of the pelvis.
25R.ThighAbout 1/3 the distance from hip joint to knee joint
26R.KneeOn the Lateral Condyle
27R.ShankAbout 1/3 the distance from knee joint to ankle joint
28R.AnkleOn the Lateral Malleolus
29R.HeelCentered on the heel
30R.ToeOver the base of the second toe
31L.ThighAbout 2/3 the distance from hip joint to knee joint
32L.KneeOn the Lateral Condyle
33L.ShankAbout 2/3 the distance from knee joint to ankle joint
34L.AnkleOn the Lateral Malleolus
35L.HeelCentered on the heel
36L.ToeOver 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.

Trial Collection

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:

Lifttrak Print Report

A green check box and a red check box will indicate within or outside normative ranges.

References

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.