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5. The moment of inertia and center of mass of each segment is needed to perform inverse dynamic analysis. Anthropometric information from Winter (1990) can be used to calculate this information. Using the data in the table below, calculate the mass of the segment, the length of the segment, the position of the center of mass (COM) in the segment, and the moment of inertia about the center of mass for the foot, shank (tibia and fibula), thigh (femur), and HAT. Assume linear segments as shown in the figure.
Segment | Segment mass / Total mass | Segment length / Height | COM position from proximal end of segment / segment length | Radius of gyration about COM / segment length |
|---|---|---|---|---|
Foot | 0.0145 | 0.055 | 0.500 | 0.475 |
Shank | 0.0465 | 0.246 | 0.433 | 0.302 |
Thigh | 0.1000 | 0.245 | 0.433 | 0.323 |
HAT | 0.6780 | 0.470 | 0.626 | 0.496 |
The height of the subject is 1.7526 m, and the mass of the subject is 66.7 kg.
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13. Look at the shapes of the curves for the hip and knee torques in early stance. Please suggest a few explanations for what you observe and propose some possible solutions to correct the problem. (Hints: consider your results for problems 6 and 10. Also, what type of marker and force plate data are you working with?).
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Insert excerpt S8.3 Inverse Dynamics Calculations S8.3 Inverse Dynamics Calculations
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