Table 4 Repetitive jumping I.

From: Jumping performance and muscle–tendon characteristics of Maasai men of East Africa

 

Maasai (n = 9)

Controls (n = 8)

95% C.I

P

Maximal repetitive jumping

 Jump height (cm)

30.4 ± 6.2

29.7 ± 4.6

 − 3.7, 5.1

0.795

 Jump height/BW (cm/kg)

0.54 ± 0.11

0.44 ± 0.07

0.0, 0.2

0.044*

 Contact time (ms)

302 ± 47

223 ± 63

22, 136

0.011*

 Jumping frequency (Hz)

1.26 ± 0.05

1.41 ± 0.13

 − 0.2, − 0.1

0.015*

Submaximal repetitive jumping

 Jump height (cm)

13.9 ± 3.9

13.9 ± 5.2

 − 4.7, 4.7

0.988

 Jump height/BW (cm/kg)

0.25 ± 0.01

0.20 ± 0.02

0.03, 0.07

0.216

 Contact time (ms)

288 ± 24

207 ± 38

49, 113

0.001*

 Jumping frequency (Hz)

1.61 ± 0.11

1.91 ± 0.35

 − 0.6, − 0.1

0.029*

Kinematics. maximal repetitive jumping

 Maximal hip joint angle (°)

127.7 ± 12.6

141.8 ± 10.2

 − 26.1, − 2.2

0.024*

 Maximal knee joint angle (°)

109.7 ± 7.3

126.4 ± 12.8

 − 27.3, − 6.1

0.004*

 Maximal ankle joint angle (°)

25.0 ± 3.8 DF

21.7 ± 5.9 DF

 − 1.8, 8.4

0.178

Kinematics. submaximal repetitive jumping

 Maximal hip joint angle (°)

146.1 ± 8.8

161.0 ± 9.3

 − 24.4, − 5.5

0.004*

 Maximal knee joint angle (°)

121.0 ± 7.3

141.2 ± 10.9

 − 29.7, − 10.8

0.001*

 Maximal ankle joint angle (°)

21.8 ± 5.2 DF

14.0 ± 8.1 DF

0.9, 14.8

0.030*

  1. Group mean ± SD. 95% confidence interval (C.I.) for differences between means.
  2. Data presented for both maximal and submaximal repetitive jumping at self-selected frequency. Data presented as an average of a number of cycles. Joint angles are presented as maximal flexion (hip and knee joint) and maximal dorsiflexion (ankle joint) during the landing relative to in situ joint position (hip joint and knee joint 180°; ankle joint 0°). DF denotes dorsiflexion.
  3. *Denotes significant group difference.
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