Statistical analysis
The statistical analysis was performed using the SPSS v21.0 software (SPSS Inc., Chicago, IL). Data are presented as mean ± SD in the table and the text. The normality of the distribution was realized using the Shapiro-Wilk test.
A two-way analyses of variance (ANOVA) [4 (Group) × 2 (Training)] was used. When significant, pairwise comparisons were assessed using the Bonferroni post-hoc test. Partial eta squared (ƞp2 ) was calculated to assess the practical significance of the findings.ƞp2 between 0 and 0.059 represent small effect, between 0.06 and 0.13 represent moderate effect and over 0.13 represent large effect.
Δ (%) = ((Post-training – Pre-training) / Post-training) × 100
Significant difference was set at p≤0.05.
Table 1. Evolution of information processing, selective attention, reaction time and score of sleep quality between before and after the training intervention for the control group (CG), the aerobic training plus vitamin D supplementation group (ATDG), the vitamin D supplementation group (VDG) and the aerobic training group (ATG).