Table 2.
Kinematic parameters of the racket tip
Kinematics of the racket tip
Drive volley
(Mean ± SD)
Groundstroke
(Mean ± SD)
p-value
Effect size
Velocity at impact
(m/s)
Horizontal velocity
21.79 ± 1.90
24.63 ± 2.44
.00
*
1.30
Vertical velocity
13.05 ± 1.52
10.91 ± 1.55
.00
*
1.39
Resultant velocity
25.46 ± 1.87
26.99 ± 2.42
.01
*
0.71
Swing duration of each phase
(s)
Preparation
0.11 ± 0.03
0.15 ± 0.04
.01
*
1.07
Early Acceleration
0.03 ± 0.01
0.02 ± 0.01
.17
0.33
Late Acceleration
0.01 ± 0.00
0.01 ± 0.00
.17
0.32
Early Follow-through
0.01 ± 0.00
0.01 ± 0.00
.04
*
1.00
Late Follow-through
0.04 ± 0.01
0.03 ± 0.01
.04
*
0.72
Average Velocity
(m/s)
Preparation
1.98 ± 0.70
1.95 ± 0.59
.82
0.05
Early Acceleration
6.01 ± 2.09
6.59 ± 2.04
.16
0.28
Late Acceleration
15.97 ± 2.91
17.39 ± 2.33
.03
*
0.54
Early Follow-through
15.19 ± 1.89
16.71 ± 2.02
.01
*
0.78
Late Follow-through
6.61 ± 1.34
7.91 ± 1.99
.03
*
0.77
* p < 0.05