Table 3. Changes in strength and sprint measures from pre- to post-intervention (mean ± SD).

Variables	Pre	Post	Hedge's g (95% CI)	Changes	Significant
20-m sprint (sec)
P-SSIT	3.41 ± 0.26	3.24 ± 0.24	-0.65 (-1.55 to 0.25) Moderate	↓	0.001
NP-SST	3.45 ± 0.23	3.25 ± 0.19	-0.91 (-1.83 to 0.01) Moderate	↓	0.007
CON	3.48 ± 0.18	3.48 ± 0.19		↔	1.000
Post-test comparisons	PSSIT vs. CON		-1.06 (-2.00 to -0.13) Moderate	↓	0.048
	NP-SSIT vs. CON		-1.16 (-2.11 to -0.21) Moderate	↓	0.050
	P-SSIT vs. NP-SSIT		-0.04 (-0.92 to 0.83) Trivial	↔	1.000
4x9-m shuttle run sec)
P-SSIT	9.49 ± 0.50	9.20 ± 0.54	-0.53 (-1.43 to 0.36) Small	↓	0.002
NP-SST	9.47 ± 0.51	9.22 ± 0.53	-0.46 (-1.35 to 0.43) Small	↓	0.001
CON	9.51 ± 0.50	9.51 ± 0.46		↔	1.000
Post-test comparisons	PSSIT vs. CON		-0.59 (-1.49 to 0.30) Small	↓	0.001
	NP-SSIT vs. CON		-0.56 (-1.45 to 0.33) Small	↓	0.001
	P-SSIT vs. NP-SSIT		-0.04 (-0.91 to 0.84) Trivial	↔	1.000
Maximal strength (kg)
P-SSIT	236.5 ± 66.3	248.5 ± 64.2	0.18 (-0.70 to 1.05) Trivial	↑	0.001
NP-SST	233.0 ± 58.8	240.5 ± 54.7	0.13 (-0.75 to 1.00) Trivial	↑	0.045
CON	229.0 ± 59.6	230.5 ± 60.3		↔	1.000
Post-test comparisons	PSSIT vs. CON		0.28 (-0.61 to 1.16) Small	↑	0.007
	NP-SSIT vs. CON		0.17 (-0.71 to 1.04) Trivial	↑	0.031
	P-SSIT vs. NP-SSIT		0.13 (-0.75 to 1.00) Trivial	↔	1.000

P-SSIT: programming volume-loads including progressive; NP-SSIT: nonprogressive; CON: control.