Variable Heights Influence Lower Extremity Biomechanics and Reactive Strength Index during Drop Jump: An Experimental Study of Male High Jumpers
Table 3
Mean values (±SD) with the Bonferroni correction of variables for DJs.
S. no.
Variables
Drop height
0.3 m
0.45 m
0.6 m
0.75 m
1
vGRF (N/kg)
35.32 ± 8.97
44.84 ± 9.53
52.31 ± 10.1#
59.99 ± 11.82+^
2
vGRFep (N/kg)
57.01 ± 13.15^#
47.7 ± 14.94
38.87 ± 10.32
35.7 ± 14.09
3
Hip extension moment (Nm/kg)
1.52 ± 0.68^
1.66 ± 0.98
1.6 ± 0.86
1.84 ± 1.1
4
Knee extension moment (Nm/kg)
3.17 ± 0.52
3.49 ± 0.53
3.74 ± 0.64
3.61 ± 0.77
5
Ankle plantarflexion moment (Nm/kg)
3.09 ± 0.61
3.34 ± 1.08
3.35 ± 0.46
3.46 ± 0.73
6
Lower limbs’ support moment (Nm/kg)
7.78 ± 0.69
8.49 ± 1.32
8.69 ± 1
8.91 ± 1.36
7
Eccentric power of the hip joint (Nm/s)
−16.55 ± 11.41#
−21.92 ± 12.65#
−31.39 ± 20.8#
−46.34 ± 31.15+^
8
Eccentric power of the knee joint (Nm/s)
−15.47 ± 5.28+^#
−20.09 ± 6.43#
−27.2 ± 8.19#
−33.57 ± 10.56+^
9
Eccentric power of the ankle joint (Nm/s)
−7.93 ± 4.72^#
−11.28 ± 7.62#
−16.07 ± 6.24
−18.21 ± 7.66+
10
Concentric power of the hip joint (Nm/s)
9.2 ± 4.33
10.38 ± 4.43#
14.33 ± 5.51#
19.73 ± 7.65+
11
Concentric power of the knee joint (Nm/s)
18.9 ± 2.3
21.33 ± 3.31#
20.8 ± 5.72
20.6 ± 5.4+
12
Concentric power of the ankle joint (Nm/s)
21.99 ± 4.54
24.02 ± 7.07
23.1 ± 3.1
22.97 ± 4.93
13
RSI (m/s)
0.15 ± 0.03
0.17 ± 0.04
0.16 ± 0.03
0.16 ± 0.04
vGRF: the peak of vertical ground reaction force; vGRFep: the peak of vertical ground reaction force in the extension phase; RSI: reactive strength index. indicates a significant difference relative to 0.3 m (), + indicates a significant difference relative to 0.45 m (), ^ indicates a significant difference relative to 0.6 m (), and # indicates a significant difference relative to 0.75 m ().
