## 2 Materials and Methods
### Procedures
#### 2.3.2 Bioimpedance Assessment  
R and Xc were measured using a BIA 101 Anniversary Sport Edition analyzer (Akern SrI, Florence, Italy) that emitted a 400 \(\mu\)A alternating sinusoidal current at 50 kHz [36]. This device was previously calibrated with a known impedance circuit provided by the manufacturer. The system measurement errors were determined by an accuracy resistor (0.1% tolerance) and capacitor (tolerance 1%), where <1 \(\Omega\) for R and <2% for Xc. The repeatability and accuracy of the real-time measurements of R and Xc allowed the smallest changes to be recorded, with 1 \(\Omega\) accuracy for R and Xc. \begin{table}
\begin{tabular}{c c c c c c c c c c c c c c c c c} \hline \hline \multicolumn{1}{c}{} & \multicolumn{4}{c}{**HR Ukrainian**} & \multicolumn{4}{c}{**HR Intensity Zones (min and \%)**} & \multicolumn{4}{c}{**HR** Intensity Zones (min and \%)**} \\ \cline{3-14} \multicolumn{1}{c}{**Subjects**} & \multicolumn{4}{c}{**HR\({}_{\text{min}}\)**} & \multicolumn{4}{c}{**Very Light**} & \multicolumn{4}{c}{**Light**} & \multicolumn{4}{c}{**Moderate**} & \multicolumn{4}{c}{**High**} & \multicolumn{4}{c}{**Very High**} & \multicolumn{4}{c}{**Maximum**} & \multicolumn{4}{c}{**Total Session**} & \multicolumn{4}{c}{**RFE–15-Point**} & \multicolumn{4}{c}{**Water Intake**} \\  & & & & **Min-50 Min** & **(01-100 Min)** & **(01-120 Min)** & **(01-120 Min)** & **(01-140 Min)** & **(01-160 Min)** & **(01-160 Min)** & **(01-160 Min)** & **(01-160 Min)** & **(01-160 Min)** & **(01-160 Min)** & **(01-160 Min)** & **(01-160 Min)** \\ \hline \multicolumn{1}{c}{} & \multicolumn{4}{c}{**Hours**} & \multicolumn{4}{c}{**\%**} & \multicolumn{4}{c}{**Hours**} & \multicolumn{4}{c}{**\%**} & \multicolumn{4}{c}{**Hours**} & \multicolumn{4}{c}{**\%**} & \multicolumn{4}{c}{**Hours**} & \multicolumn{4}{c}{**\%**} & \multicolumn{4}{c}{**Hours**} & \multicolumn{4}{c}{**\%**} & \multicolumn{4}{c}{**Hours**} \\ \hline
1 & 61 & 72 & 132 & 189 & 0.20 & 19.9 & 0.24 & 21.2 & 0.24 & 15.9 & 0.27 & 17.9 & 0.29 & 19.2 & 0.09 & 6.0 & 2.31 & 15.0 & 1.40 \\
2 & 56 & 71 & 134 & 190 & 0.19 & 12.6 & 0.49 & 32.5 & 0.35 & 22.2 & 0.20 & 13.2 & 0.16 & 10.6 & 0.12 & 7.9 & 2.31 & 16.0 & 1.20 \\
3 & 52 & 63 & 129 & 183 & 0.16 & 10.7 & 0.33 & 22.0 & 0.35 & 22.3 & 0.23 & 0.20 & 13.2 & 0.16 & 0.12 & 7.9 & 2.31 & 16.0 & 1.20 \\
4 & 56 & 68 & 128 & 90 & 215 & 13.0 & 0.40 & 27.8 & 0.29 & 20.1 & 0.19 & 13.2 & 0.23 & 16.0 & 0.11 & 7.6 & 2.24 & 17.0 & 2.25 \\
5 & 53 & 61 & 117 & 180 & 0.12 & 7.9 & 0.27 & 17.8 & 0.33 & 21.7 & 0.35 & 21.0 & 0.18 & 11.8 & 2.32 & 12.0 & 2.25 \\
6 & 55 & 65 & 122 & 177 & 0.01 & 6.8 & 0.15 & 10.2 & 0.24 & 16.3 & 0.24 & 0.37 & 25.2 & 0.25 & 17.0 & 22.7 & 13.0 & 1.60 \\
7 & 58 & 66 & 129 & 184 & 0.20 & 13.2 & 0.50 & 19.9 & 0.33 & 21.9 & 0.24 & 15.9 & 0.28 & 18.5 & 0.16 & 10.6 & 2.31 & 15.0 & 1.60 \\ \hline Average & 55.9 & 66.6 & 127.3 & 184.7 & 0.18 & 12.3 & 0.32 & 21.6 & 0.29 & 19.8 & 0.26 & 17.4 & 0.28 & 18.9 & 0.14 & 10.0 & 2.29 & 14.7 & 1.7 \\ SD & 3.0 & 4.0 & 55.9 & 5.2 & 0.06 & 4.5 & 0.10 & 7.1 & 0.04 & 3.2 & 0.06 & 4.3 & 0.07 & 4.7 & 0.05 & 3.7 & 0.02 & 1.7 & 0.4 \\ \hline \multicolumn{1}{c}{} & \multicolumn{4}{c}{**HR, heart rate: RPF, rate of perceived exertion.**} & \multicolumn{4}{c}{**\%**} & \multicolumn{4}{c}{**\%**} & \multicolumn{4}{c}{**\%**} & \multicolumn{4}{c}{**\%**} & \multicolumn{4}{c}{**\%**} & \multicolumn{4}{c}{**\%**} & \multicolumn{4}{c}{**\%**} & \multicolumn{4}{c}{**\%**} & \multicolumn{4}{c}{**\%**} & \multicolumn{4}{c}{**\%**} \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Individual values of training session details. All players were instructed to take a cold shower (as cold as tolerable) for 10-15 min post-training, in order to reduce cutaneous blood flow and temperature and remove accumulated electrolytes [37], reducing a possible bias in the analysis caused by a change in body temperature.