Table 3.

Changes in selected biochemical indicators of blood and physical fitness in young soccer players in the supplemented group (GS) and placebo (GP) in the T2, T3, and T4 time points of the research program.

Group	GS			ICC	α	GP			ICC	α	Inter-Actions	p	pη2	OP
Time-Point	T2	T3	T4			T2	T3	T4
25(OH)D (ng/mL)	24.1 ± 5.23	26.6 ± 6.35	41.7 ± 6.95 *,†	0.18	0.76	24.8 ± 4.77	26.2 ± 4.52	39.5 ± 6.91 *,†	0.11	0.69	time	<0.001	0.82	1.00
Ca (mg/dL)	10.0 ± 0.32	9.8 ± 0.30 *	9.9 ± 0.31	0.74	0.79	10.0 ± 0.15	9.8 ± 0.28 *	9.7 ± 0.28 *	0.59	0.75	time	0.001	0.27	0.93
P (mg/dL)	4.31 ± 0.52	4.13 ± 0.57	4.03 ± 0.79	0.78	0.81	4.23 ± 0.55	3.99 ± 0.49	3.83 ± 0.32 *	0.58	0.68	time	0.012	0.18	0.78
PTH (ng/mL)	33.9 ± 11.64	41.0 ± 11.83 *	31.8 ± 7.74 †	0.71	0.81	31.0 ± 19.11	38.8 ± 10.41 *	33.5 ± 13.54	0.77	0.83	time	0.003	0.23	0.88
PACER (m)	2518 ± 145.5	2491 ± 188.8	2380 ± 138.9 *	0.84	0.94	2434 ± 237.4	2459 ± 285.8	2456 ± 196.6	0.90	0.92	group × time	0.011	0.19	0.79
VO2max (ml/kg/min)	59.2 ± 1.91	59.0 ± 2.60	57.7 ± 1.57 *,†	0.78	0.91	58.4 ± 3.54	58.5 ± 3.98	58.4 ± 2.73	0.89	0.91	-	-	-	-
10m (s)	1.75 ± 0.04	1.76 ± 0.04	1.72 ± 0.06 *,†	0.56	0.66	1.71 ± 0.05	1.71 ± 0.04	1.71 ± 0.06	0.74	0.78	-	-	-	-
30m (s)	4.24 ± 0.17	4.24 ± 0.11	4.15 ± 0.12 *,†	0.76	0.89	4.18 ± 0.13	4.14 ± 0.10	4.08 ± 0.11 *,†	0.82	0.93	time	<0.001	0.42	0.99
SJ (cm)	36.9 ± 3.59	37.9 ± 3.39	37.3 ± 3.95	0.72	0.80	38.9 ± 4.76	37.9 ± 3.68	38.5 ± 3.95	0.82	0.86	-	-	-	-
CMJ (cm)	43.7 ± 4.91	44.2 ± 3.66	45.6 ± 4.03	0.80	0.88	44.7 ± 4.95	44.9 ± 4.26	46.1 ± 3.44	0.86	0.90	time	0.031	0.15	0.65
10 jumps (cm)	38.8 ± 4.24	39.3 ± 3.82	40.9 ± 3.44 *	0.71	0.82	39.9 ± 3.67	39.4 ± 2.93	39.9 ± 2.10	0.82	0.84	-	-	-	-

* Significantly different from T2; † significantly different from T3; GS—supplemented group; GP—placebo group; P—phosphorus; PTH—parathyroid hormone; SJ—squat jump; CMJ—counter movement jump, pη2—partial eta squared, OP—observed power; ICC—interclass correlation coefficient; α—Cronbach’s alpha.