Table 4.
Changes in selected blood biochemical and physical performance indicators in young footballers in the group with optimal (ODG, n = 18) and suboptimal (SDG, n = 17) 25(OH)D blood serum concentration before (PRE) and after (POST) testing program.
| ODG (n = 18) | SDG (n = 17) | |||||
| Variable | PRE | POST | PRE | POST | Interaction | ES |
| WBC (103/µL) | 5.61 ± 0.69 | 6.45 ± 0.93 † | 6.26 ± 1.26 | 6.77 ± 1.66 | Time | 0.21 |
| RBC (104/ µL) | 5.18 ± 0.29 | 5.25 ± 0.35 | 5.10 ± 0.29 | 5.33 ± 0.35 # | TimeGroup x time | 0.320.13 |
| HGB (g/dL) | 15.19 ± 0.43 | 15.48 ± 0.75 | 14.81 ± 0.81 | 15.53 ± 0.74 # | Time | 0.41 |
| HCT (%) | 45.32 ± 1.57 | 45.97 ± 1.98 | 44.21 ± 2.09 | 45.95 ± 2.36 # | Time | 0.33 |
| PLT (103/µL) | 221.89 ± 33.99 | 230.22 ± 34.38 | 245.94 ± 41.22 | 242.76 ± 38.93 | - | - |
| TC (mg/dL) | 144.44 ± 19.23 | 146.56 ± 19.54 | 137.06 ± 22.08 | 139.47 ± 21.31 | - | - |
| HDL-C (mg/dL) | 56.22 ± 9.15 | 54.44 ± 9.19 | 56.35 ± 9.61 | 57.00 ± 8.04 | - | - |
| LDL-C (mg/dL) | 74.78 ± 15.98 | 71.72 ± 12.74 | 68.65 ± 20.62 | 64.41 ± 17.84 | - | - |
| TG (mg/dL) | 67.56 ± 26.50 | 102.56 ± 49.94 | 59.53 ± 11.71 | 85.24 ± 36.62 † | Time | 0.40 |
| ALT (U/L) | 20.83 ± 5.52 | 21.17 ± 9.17 | 18.06 ± 5.04 | 17.53 ± 5.57 | - | - |
| AST (U/L) | 30.78 ± 8.00 | 24.17 ± 5.42 † | 27.53 ± 8.88 | 21.76 ± 5.67 # | Time | 0.52 |
| CK (U/L) | 445.33 ± 253.51 | 207.50 ± 135.75 # | 367.12 ± 216.82 | 172.24 ± 76.33 # | Time | 0.52 |
PRE-POST differences at: † p < 0.01, # p < 0.001; ES—effect size; ODG—optimal 25(OH)D concentration group; SDG—suboptimal 25(OH)D concentration group; WBC—white blood cells; RBC—red blood cells; HGB—haemoglobin; HCT—haematocrit; PLT—thrombocytes; TC—total cholesterol; HDL-C—high-density cholesterol; LDL-C—low-density cholesterol; TG—triglycerides; ALT—alanine aminotransferase; AST—aspartate aminotransferase; CK—creatine kinase.