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McDonald et al., (1996) Lower limb kinematics during treadmill walking after space flight: implications for gaze stabilization.

McIntyre, & Pfautsch (1982) A kinematic analysis of the baseball batting swing involved in opposite-field and same-field hitting.

1. Using the raw data obtained from the goniometer during this week's class, develop a single-stride phase plane portrait. This means you will need to calculate the velocity. Does this week's phase portrait closely resemble last week's phase portrait for the same movement? Why or why not?

2. Smooth each of the single-stride raw data files using a 50 point Excel window. Stride One consists of the points from 4548-5823. Stride Two consists of the points 5824-7087. Stride Three consists of the points 7088-8857. Next, using your smoothed data, develop a phase plane portrait that contains all three strides overlaid upon one another. In terms of variability, how does your portrait compare to the preflight knee phase portraits presented by McDonald et al.?

3. Using a single trial of the raw data obtained from the goniometer during the in-class jump, develop an angle-angle diagram. Next smooth the single trial that you used to develop your initial angle-angle diagram using a 10 point window. Using the smoothed data, develop an angle-angle diagram that you overlay into your original angle-angle diagram. How does smoothing impact the graph. Was information lost or gained when you smoothed your data? For the knee angle you should use points 1018-3290. For the ankle you should use points 877-3149.

4. In McDonald's et al., work, what would you say was the value of using phase plane portraits?

5. In Mcintyre and Pfautsch work what would you say was the value of using angle-angle diagrams?