Table 4.
Correlations between anthropometric parameters, physical activity level, values of maximum rate of oxygen uptake, and serum concentrations of measured parameters after consecutive stages.
| Related Variables | Stage ID | Stage ID&BEET |
|---|---|---|
| PA versus VO2max (mL/kg/min) | r = 0.692, p = 0.001 | r = 0.632, p = 0.004 |
| FFM% versus VO2max (mL/kg/min) | r = 0.496, p = 0.026 | r = 0.471, p = 0.042 |
| FFM% versus LDH (U/L) | r = 0.434, p = 0.056 | r = 0.511, p = 0.021 |
| FFM% versus β-carotene (µmol/L) | r = −0.610, p = 0.004 | r = −0.555, p = 0.011 |
| LDH (U/L) versus β-carotene (µmol/L) | r = −0.468, p = 0.037 | r = −0.479, p = 0.033 |
| ∆LDH (U/L) versus ∆MDA (nmol/L) | r = 0.588, p = 0.006 | r = 0.465, p = 0.045 |
| ∆β-carotene (µmol/L) versus ∆VO2max (mL/kg/min) | r = 0.130, p = 0.584 | r = −0.500, p = 0.029 |
| ∆β-carotene (µmol/L) versus ∆AOPP (µmol/L) | r = 0.278, p = 0.235 | r = 0.623, p = 0.003 |
| ∆LDH (U/L) versus ∆VO2max (mL/kg/min) | r = 0.239, p = 0.311 | r = −0.518, p = 0.028 |
| ∆MDA (nmol/L) versus ∆VO2max (mL/kg/min) | r = 0.108, p = 0.651 | r = −0.472, p = 0.036 |
| LDH (U/L) versus CK (U/L) | r = 0.404, p = 0.078 | r = 0.620, p = 0.004 |
| ∆PA versus ∆GPx-3 (U/mL) | r = −0.171, p = 0.472 | r = 0.471, p = 0.036 |
| MDA (nmol/L) versus GPx-3 (u/mL) | r = −0.033, p = 0.891 | r = 0.447, p = 0.048 |
| ∆LDH (U/L) versus ∆GPx-3 (u/mL) | r = −0.011, p = 0.964 | r = 0.600, p = 0.007 |
| ∆LDH (U/L) versus ∆GPx-1 (u/g HGB) | r = 0.011, p = 0.963 | r = 0.467, p = 0.044 |
| ∆CP (u/L) versus ∆IL-6 (pg/mL) | r = −0.230, p = 0.360 | r = −0.486, p = 0.041 |
| GPx-3 (u/mL) versus Selenium (µg/L) | r = 0.456, p = 0.043 | r = 0.196, p = 0.408 |
| GPx-3 (u/mL) versus AOPP (µmol/L) | r = 0.528, p = 0.017 | r = 0.223, p = 0.345 |
| CP (u/L) versus Copper (µg/L) | r = 0.518, p = 0.019 | r = 0.229, p = 0.332 |
| CP (u/L) versus AOPP (µmol/L) | r = −0.445, p = 0.049 | r = 0.195, p = 0.411 |
| Vit. E (mg/L) versus Vit. A (mg/L) | r = 0.521, p = 0.019 | r = 0.566, p = 0.009 |
| ∆Vit. E (mg/L) versus ∆Vit. A (mg/L) | r = 0.553, p = 0.011 | r = 0.520, p = 0.019 |
Δ: The change represents: ID minus B measurement after the stage ID or ID&BEET minus ID measurement after the stage ID&BEET—respectively; bold values denote statistical significance at the p < 0.05 level; B: Baseline parameters; ID: The first stage of the study (implementation of dietary recommendations); ID&BEET: The second stage of the study (implementation of dietary recommendations and beetroot juice supplementation); FM%: Fat mas percent; FFM%: Fat free mass percent; VO2max: Maximum rate of oxygen uptake; PA: Mean physical activity level; Vit.: Vitamin; GPx-1: Erythrocyte glutathione peroxidase activity; HGB: Hemoglobin; GPx-3: Serum glutathione peroxidase activity; CP: Ceruloplasmin; AOPP: Advanced oxidation protein products; MDA: Malondialdehyde; 8-oxodG: 8-oxo-7.8-dihydro-2′-deoxyguanosine; cr.: Creatinine; IL-6: Interleukin 6; LDH: Lactate dehydrogenase; CK: Creatine kinase.