An Analysis of the Factors Which Distinguish Tennis Players of Different Serving Abilities Page: 13
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13
30.5 cm to the right of the center mark. The experimental
set-up was as illustrated in Figure 1.
At the completion of each trial, the linear coordinates
of the point of ball contact on the court with respect to an
origin established at the center of the target area were
measured and recorded.
Data Acquisition Procedures
The motion of the subject, the racquet, and the ball
was analyzed for five successful serves (good serves) and
five unsuccessful serves (fault serves). Only fault serves
which cleared the net were evaluated, so that values for
accuracy could be computed. Analysis was done from the
initial time, taken to be when the subject's racquet was at
the lowest point in the vertical direction upon beginning
the service motion, to the final time, when the subject's
racquet was at the lowest point in the vertical direction
after ball contact. This was done with the aid of a
Lafayette 16mm Analyzer (Lafayette Instrument Co.,
Lafayette, IN) in conjunction with a Numonics Electronic
Graphics Digitizer (Model 1200, Numonics Corporation, North
Wales, PA), which was interfaced to a Tektronix 4052
Graphics Calculator (Tektronix Inc., Beverton, OR). The
x- and y- coordinates of the skin overlying the projected
image of the following landmarks were digitized and recorded
for each film frame:
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Riley-Hagan, Margaret. An Analysis of the Factors Which Distinguish Tennis Players of Different Serving Abilities, thesis, August 1985; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc504417/m1/20/: accessed April 26, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .