Table 3 Swing velocity, head movement, and step width during stance, load, foot contact, pre-swing, and ball contact

Swing velocity (mph)

41.0 ± 4.5

43.6 ± 4.9^†

46.1 ± 4.8^*†

0.706

48.9 ± 5.6

53.7 ± 6.9^*

59.0 ± 8.8^*†

0.686

Head movement ST to FC (cm)

11.2 ± 2.4

11.3 ± 2.7

9.3 ± 2.4^*†

0.188

9.9 ± 1.7

7.8 ± 1.9^*

8.2 ± 1.4^*

0.370

Head movement FC to BC (cm)

7.8 ± 1.0

8.5 ± 1.2

6.5 ± 1.1^*†

0.436

6.2 ± 1.2

4.7 ± 1.0^*

3.8 ± 0.6^*†

0.731

Step width at Stance (cm)

40.5 ± 3.0

38.7 ± 2.8

41.8 ± 2.8^†

0.300

44.1 ± 3.3

45.8 ± 3.0

47.0 ± 3.7

0.166

Step width at FC (cm)

49.1 ± 5.3

50.4 ± 3.9

52.8 ± 4.3^*

0.219

56.0 ± 5.1

59.0 ± 4.6

59.7 ± 4.1

0.180