Exploring of two different equated instability resistance training programs on measure of physical fitness and lower limb asymmetry in pre-pubertal weightlifters

Table 2 Pre-and-post-intervention values of IRT1 (low-intensity high-volume instability resistance training [2 sets × 8 repetitions 20%1RM], n = 16) and IRT2 (moderate-intensity low-volume instability resistance training [2 sets × 4 repetitions 40%1RM], n = 16) in strength, power, and balance tests

Variable	Group	Baseline			Follow-up		Δ%	Sig.	ES
Variable	Group	M	SD		M	SD	Δ%	Sig.	ES
Strength and power variables
1RM (kg)	IRT1	36.06*		4.91	45.94*	3.66	27.40	< 0.001	2.24
1RM (kg)	IRT2	30.69		2.94	40.75	5.00	32.78	< 0.001	2.39
SLH (Dominant; cm)	IRT1	170.63		19.74	182.19*	15.81	6.77	0.003	0.63
SLH (Dominant; cm)	IRT2	158.44		21.58	167.81	17.41	5.91	0.015	0.47
SLH (Non-dominant; cm)	IRT1	145.00		22.21	162.81	17.22	12.28	< 0.001	0.87
SLH (Non-dominant; cm)	IRT2	138.13		14.24	151.88	15.80	9.95	< 0.001	0.89
3 H (cm)	IRT1	449.38		30.87	516.25*	42.56	14.88	< 0.001	1.75
3 H (cm)	IRT2	423.13		39.79	469.69	64.56	11.00	0.001	0.85
Lower inter-limb asymmetry	IRT1	15.09		7.31	10.66	5.16	-29.36	0.015	0.68
Lower inter-limb asymmetry	IRT2	12.29		6.20	9.41	4.20	-23.43	0.103	0.53
Balance variables
CoP SA (mm²)	IRT1	1940.17	718.80		548.21*	164.47	-71.74	< 0.001	2.60
CoP SA (mm²)	IRT2	2158.47	799.11		692.80	216.02	-67.90	< 0.001	2.44
CoP X (mm)	IRT1	2110.29	660.59		1687.12	608.50	-20.05	0.019	0.65
CoP X (mm)	IRT2	2134.54	668.69		1690.68	613.69	-20.79	0.014	0.67
CoP Y (mm)	IRT1	2110.78	540.92		1728.89	477.35	-18.09	0.002	0.73
CoP Y (mm)	IRT2	2247.15	706.96		1936.52	603.05	-13.82	0.008	0.46
CoP V (mm/s)	IRT1	63.61	16.74		50.76	15.20	-20.20	0.005	0.78
CoP V (mm/s)	IRT2	66.37	18.61		60.34	13.27	-9.09	0.166	0.36

Notes. * Statistically significant difference between baseline or follow-up measurement groups. 1RM: one repetition maximum; SLH Dominant: single leg hop test with the dominant leg; SLH Non-Dominant: single leg hop test with the non-dominant leg; 3 H: triple hop test; CoP SA: surface area of the center of pressure oscillation; CoP X: lateral displacement of the center of pressure oscillation; CoP Y: anteroposterior displacement of the center of pressure oscillation; CoP V: center of pressure oscillation velocity; M: mean; SD: standard deviation; Sig: p-value of the significance of the posthoc test (pre-post); ES: Effect size (Cohen’s d)

ISSN: 2052-1847