Appendix A. Results for three different explanatory variables, for three different subjects, processed using three different filtering approaches: (1) unfiltered, (2) filtering the entire trial, through impact, and (3) the linear extrapolation technique described by Knudson and Bahamonde (2001). The extrapolation and unfiltered technique resulted in results that were very similar.
| Racquet Trajectory Before Impact (°o) |
| Subject |
Filtered |
Extrapolated |
Unfiltered |
| 1 |
27.54 |
28.38 |
28.38 |
| 2 |
34.01 |
31.54 |
31.30 |
| 3 |
41.70 |
37.67 |
37.71 |
| Racquet Horizontal Velocity Before Impact (°m/s) |
| Subject |
Filtered |
Extrapolated |
Unfiltered |
| 1 |
19.20 |
19.81 |
19.20 |
| 2 |
8.58 |
10.37 |
10.34 |
| 3 |
10.22 |
12.22 |
12.13 |
| Racquet Vertical Velocity Before Impact (°m/s) |
| Subject |
Filtered |
Extrapolated |
Unfiltered |
| 1 |
9.58 |
10.33 |
10.37 |
| 2 |
7.65 |
8.01 |
7.99 |
| 3 |
7.05 |
7.16 |
7.16 |
