TABLE 2.
Association of athletic performance with vitamin D metabolites by multiple regression analyses* in indoor players (n = 16).
| Physical fitness test variables | Total 25-(OH)D (ng/mL) | 24,25-(OH)2D3 (ng/mL) | 3-epi-25-(OH)D3 (ng/mL) | 1,25(OH)2D (pg/ml) | ||||
|---|---|---|---|---|---|---|---|---|
| ß (95% CI) | p-value | ß (95% CI) | p-value | ß (95% CI) | p-value | ß (95% CI) | p-value | |
| VO2max (ml/kg/min) | 0.194 (−0.447–0.835) | 0.55 | 0.173 (−0.470–0.817) | 0.60 | 0.050 (−0.602–0.703) | 0.88 | −0.373 (−0.980–0.233) | 0.23 |
| Handgrip strength L (kg) | 0.456 (−0.010–0.923) | 0.055 | 0.305 (−0.194–0.804) | 0.23 | 0.615 (0.202–1.028) | 0.004 | −0.338 (−0.831–0.155) | 0.18 |
| Handgrip strength R (kg) | 0.461 (−0.003–0.926) | 0.052 | 0.415 (−0.061–0.892) | 0.088 | 0.612 (0.198–1.026) | 0.004 | −0.480 (−0.939–−0.020) | 0.041 |
| Jump height (cm) | 0.540 (0.099–0.980) | 0.016 | 0.550 (0.113–0.990) | 0.014 | 0.701 (0.327–1.074) | <0.001 | −0.378 (−0.863–0.107) | 0.13 |
| Peak force (N) | 0.287 (-0.214–0.789) | 0.26 | 0.339 (-0.154–0.832) | 0.18 | 0.460 (−0.005–0.925) | 0.052 | −0.339 (−0.832–0.153) | 0.18 |
| Peak velocity [m/s] | 0.518 (0.070–0.970) | 0.024 | 0.534 (0.092–0.980) | 0.018 | 0.673 (0.286–1.060) | <0.001 | −0.421 (−0.896–0.054) | 0.083 |
| Peak power (W) | 0.538 (0.096–0.980) | 0.017 | 0.536 (0.094–0.980) | 0.018 | 0.766 (0.430–1.103) | <0.001 | −0.393 (−0.875–0.089) | 0.11 |
| RSImod (m/s) | 0.511 (0.060–0.960) | 0.026 | 0.547 (0.108–0.990) | 0.015 | 0.599 (0.179–1.018) | 0.005 | −0.302 (−0.802–0.197) | 0.24 |
| Peak force (N/kg) | 0.153 (-0.365–0.670) | 0.56 | 0.331 (-0.163–0.826) | 0.19 | 0.108 (−0.413–0.628) | 0.69 | −0.339 (−0.832–0.154) | 0.18 |
| Peak power (W/kg) | 0.681 (0.298–1.065) | <0.001 | 0.716 (0.350–1.081) | <0.001 | 0.784 (0.459–1.109) | <0.001 | −0.477 (−0.938–−0.017) | 0.042 |
| Peak propulsive force/kg (N/kg) | 0.183 (-0.331–0.698) | 0.48 | 0.372 (-0.115–0.858) | 0.13 | 0.119 (−0.401–0.639) | 0.65 | −0.353 (−0.843–0.137) | 0.16 |
| AVG propulsive force/kg (N/kg) | 0.616 (0.203–1.029) | 0.003 | 0.716 (0.350–1.082) | <0.001 | 0.530 (0.086–0.970) | 0.019 | −0.376 (−0.862–0.109) | 0.13 |
| Peak propulsive power/kg (W/kg) | 0.686 (0.305–1.067) | <0.001 | 0.725 (0.364–1.086) | <0.001 | 0.776 (0.446–1.106) | <0.001 | −0.482 (−0.941–−0.023) | 0.040 |
| AVG propulsive power/kg (W/kg) | 0.631 (0.225–1.038) | 0.002 | 0.719 (0.356–1.083) | <0.001 | 0.703 (0.331–1.076) | <0.001 | −0.469 (−0.932–−0.007) | 0.047 |
Statistically significant variables were adjusted for age, body mass, and body fat; ß, unstandardized coefficient; 95%CI, confidence interval; VDBP, vitamin D binding protein; VO2max, maximal oxygen uptake; L, left; R, right; CMJ, countermovement vertical jump; AVG, average. Bold values are statistically significant.