TABLE 4.

EFFECTS OF PLYOMETRIC TRAINING ON VERTICAL LANDING FORCE, JUMP HEIGHT, RANGE OF KNEE FLEXION, AND LANDING TIME IN REPEATED COUNTERMOVEMENT JUMP (RCMJ). DATA ARE PRESENTED AS THE MEAN (± SD) AND EFFECT SIZE (ES)

Test	Parameter	Group	Pre	Post	Change		ES
					Absolute	%
RCMJ	GRF/BW (NN-1)	SJG	3.76 ± 0.60	3.88 ± 0.53	0.12	3.2	0.2
		RJG	3.83 ± 0.61	3.47 ± 0.55*†‡	-0.36	-9.4	0.6
		CON	3.73 ± 0.58	3.79 ± 0.57	0.6	1.6	0.1
	h (cm)	SJG	36.1 ± 6.4	41.4 ± 5.1*‡	5.3	14.7	0.9
		RJG	37.3 ± 5.3	43.6 ± 5.5*‡	6.3	16.8	1.1
		CON	35.1 ± 5.8	35.8 ± 5.9	0.7	2.0	0.1
	KF (°)	SJG	85.5 ± 3.6	83.9 ± 4.1*	-1.6	-1.9	0.5
		RJG	84.1 ± 3.1	87.5 ± 3.4*†‡	3.4	4.0	1.0
		CON	85.9 ± 3.3	85.1 ± 3.5	-0.8	-0.9	0.2
	LT (s)	SJG	0.216 ± 0.028	0.198 ± 0.021*‡	-0.018	-8.3	0.7
		RJG	0.205 ± 0.022	0.225 ± 0.021*†‡	0.020	9.8	0.7
		CON	0.215 ± 0.027	0.218 ± 0.027	0.003	1.4	0.1

Note: RCMJ = repeated countermovement jump; VGRF = vertical landing force; h = jump height; KF = range of knee flexion during landing; LT = landing time. SJG = single jump group; RJG = repeated jumps group; CON = control group.

^*Significant difference from pre-training values (p < 0.01).

^†Significantly different change than in SJG (p < 0.05).

^‡Significantly different change than in CON (p < 0.05)