Table 1. Peak vGRF, angles, and moments of the lower extremity measured during drop vertical jumps before and after repeated jumping exercise on a trampoline or on the ground.

	Trampoline		Ground
	Pre-trial	Post-trial	Pre-trial	Post-trial
vGRF (N/kg)	2.40 ± 0.68	2.77 ± 0.87 a	2.21 ± 0.52	2.61 ± 0.61 c
Angles (°)
Hip flexion angle	54.2 ± 12.2	51.2 ± 13.2 b	56.7 ± 12.4	55.0 ± 10.8
Hip adduction angle	−1.1 ± 6.4	0.7 ± 6.4 a	1.8 ± 6.3	1.0 ± 4.8
Knee flexion angle	70.7 ± 14.8	67.5 ± 13.2	72.0 ± 10.3	74.8 ± 10.0
Knee abduction angle	6.1 ± 8.0	6.4 ± 8.8	3.2 ± 3.5	3.3 ± 4.4
Ankle dorsiflexion angle	35.9 ± 7.1	34.5 ± 6.8	33.2 ± 6.6	35.0 ± 5.9 c
Joint moments (Nm/kg)
Hip extensor moment	2.63 ± 2.55	3.16 ± 3.07 b	2.08 ± 0.74	2.74 ± 0.94 c
Hip abductor moment	1.15 ± 1.00	1.05 ± 0.89	0.84 ± 0.41	1.00 ± 0.53
Knee extensor moment *	1.51 ± 0.60	1.67 ± 0.72 b	1.43 ± 0.48	1.53 ± 0.43
Knee adductor moment	0.61 ± 0.34	0.70 ± 0.40	0.56 ± 0.29	0.62 ± 0.30
Ankle plantar flexor moment	2.06 ± 0.50	2.03 ± 0.51	2.03 ± 0.62	2.01 ± 0.39

vGRF: vertical ground reaction force. ^* Significant difference at p<0.05 comparing trials post repeated jumping exercise on a trampoline and on the ground. ^a Significant difference at p<0.01 comparing trials before and after repeated jumping exercise on a trampoline. ^b Significant difference at p<0.05 comparing trials before and after repeated jumping exercise on a trampoline. ^c Significant difference at p<0.01 comparing trials before and after the repeated jumping exercise on the ground.