Fig 1.
Mean foot position on ad and deuce court side immediately before ball toss.
Table 1.
Peak and terminal kinematic variables of interest for the ad and deuce service side.
Fig 2.
Subgroup analysis of side differences in upper torso range of motion between foot-up and foot-back players (95% CI).
Table 2.
Upper torso ROM in foot-up and foot-back players.
Fig 3.
Upper torso rotation at start, maximum backward rotation (clockwise), and impact on ad and deuce court side.
A) red line: mirror image transferred from the ad court kinematics to the deuce court (total ROM: 126.7°, counter-rotation ROM: 50.9°); B) red line: mirror image transferred from the deuce court kinematics to the ad court (total ROM: 130.5°, counter-rotation ROM: 44.7°).
Fig 4.
Mean ball displacement and upper torso rotation at impact.