2.5. Statistical Analysis
All statistical analyses were performed using SPSS version 25.0 (IBM Corp., Armonk, NY, USA) for Windows. Data are reported as the mean ± standard deviation. The normality of the distribution of all acquired data was verified using the Shapiro–Wilk W-test prior to the parametric tests. To verify the difference in efficacy between each supplement, which was the main purpose of the present study, metabolic function, skeletal muscle oxygenation, and cardiac function were analyzed using one-way analysis of variance (ANOVA) with repeated measures. Two-way ANOVA with repeated measures was used to assess the presence of interactions (supplement × time) and the main effects (supplement or time) on RPE, blood lactate, and antioxidant biomarkers. When ANOVA revealed a significant interaction or main effect within the trial (supplement), a Bonferroni post hoc test was used to identify within-trial differences at each time point. The level of significance was set a priori at 