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Table 2 Mean (SD) maximum anatomical joint angles in degrees.

From: Lower trunk kinematics and muscle activity during different types of tennis serves

Serve type

Flat

Top-spin

Slice

Motion*

AV

AI

AV

AI

AV

AI

Extension#

19.3

(11.9)

27.5

(10.9)

19.3

(10.6)

31.9

(17.2)

20.0

(10.1)

26.9

(7.6)

Left lateral Flexion#

16.0

(4.1)

12.3

(5.2)

15.5

(5.4)

10.9

(4.8)

15.4

(5.3)

12.4

(8.4)

Left Twisting

7.9

(4.3)

6.8

(3.8)

6.8

(4.1)

5.4

(0.96

5.5

(3.8)

4.3

(3.1)

Right Twisting

5.6

(4.6)

4.2

(1.8)

6.1

(6.9)

4.1

(0.6)

11.2

(12.7)

4.1

(3.1)

  1. * Significant difference among different motions (p < 0.01).
  2. # Significant difference between AV (advanced) and AI (advanced intermediate) groups (p < 0.05).