Table 4.

Repetitive jumping I.

	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*

Group mean ± SD. 95% confidence interval (C.I.) for differences between means.

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.

*Denotes significant group difference.