2.6. Statistics
The results of the study are presented in tables as the medians and interquartile ranges (Me (Q1–Q3)). The change in the range of selected parameters (Δ) within the study groups was calculated by subtracting the values in the 2nd term from the values in the 1st term of the study. The normality of distribution was tested using the Shapiro–Wilk test. The significance of differences between the values recorded before and after the completion of the intervention for each study group was performed using Wilcoxon’s non-parametric paired-order test. The significance of the differences between the post-training change in values of the studied parameters between groups was calculated using the U-Mann–Whitney test. The correlation was calculated using Spearman’s rank-sum test. The results were statistically analyzed using Dell Statistica data analysis software (version 13, software.dell.com, Dell Inc., Round Rock, TX, USA). Test results were considered significant starting from a significance level of 