## 3 Results
As for depression-dejection, no statistically significant changes over time were indicated, either when considering the whole sample or for the \begin{table}
\begin{tabular}{l l l l l l} \hline  & **Group** & **Phase 1** & **Phase 2** & **Phase 3** & **Statistical Analyses** \\ \hline \multirow{4}{*}{Fatigue} & Control & 1.81 \(\pm\) 1.03 & – & 1.54 \(\pm\) 0.82 & I: t(28) = 1.886; \(p\) = 0.414 \\  & Winter swimmers & 1.20 \(\pm\) 0.80 & 0.49 \(\pm\) 0.44 & 0.34 \(\pm\) 0.26 & II: F(1, 30) = 5.143; \(p\) > 0.001; \(\tau_{\rm Hb}\)\({}^{2}\) = 0.364 \\  & Winter swimmers & 1.20 \(\pm\) 0.80 & 0.49 \(\pm\) 0.44 & 0.34 \(\pm\) 0.26 & III: F(1, 30) = 4.507; \(p\) = 0.042; \(\tau_{\rm Hb}\)\({}^{2}\) = 0.131 \\  & & & & & IVa: F(2, 30) = 12.950; \(p\) = 0.001; \(\tau_{\rm Hb}\)\({}^{2}\) = 0.463 \\  & & & & & IVb: \(\chi^{2}(2,30)\) = 10.72; \(p\) = 0.005 \\ \hline \multirow{4}{*}{Confusion} & Control & 1.45 \(\pm\) 0.70 & – & 1.15 \(\pm\) 0.70 & I: t(28) = 1.690; \(p\) = 0.608 \\  & & & & & II: F(1, 30) = 10.750; \(p\) = 0.003; \(\tau_{\rm Hb}\)\({}^{2}\) = 0.264 \\ \cline{1-1}  & Winter swimmers & 1.08 \(\pm\) 0.51 & 0.82 \(\pm\) 0.57 & 0.79 \(\pm\) 0.42 & III: F(1, 30) = 0.001; \(\tau_{\rm Hb}\)\({}^{2}\) = 0.001 \\ \cline{1-1}  & & & & & IVa: F(2, 30) = 2.814; \(p\) = 0.076; \(\tau_{\rm Hb}\)\({}^{2}\) = 0.158 \\ \hline \multicolumn{4}{l}{1: results of the \(t\)-test with Bonferroni correction (control vs. winter swimmers in phase 1); II: results of general linear model analyses changes in time [phase 1 vs. phase 3] \(\times\) group [winter swimmers vs. control group]; IVa: results of general linear model analyses changes in time for the winter swimmers group [phase 1 vs. phase 2 vs. phase 3]; IVb: results of the Friedman test analyses mood changes in time for the winter swimmers group [phase 1 vs. phase 2 vs. phase 3].} \\ \end{tabular}
\end{table} 
Table 2: _Cont._ \begin{table}
\begin{tabular}{l l l l l} \hline  & **Group** & **Phase 1** & **Phase 3** & **Statistical Analyses** \\ \hline \multirow{2}{*}{Noradrenaline (pmol/L)} & Control & 2010.7 \(\pm\) 271.1 & 2052.8 \(\pm\) 770.83 & I: t(28) = 0.752; \(p\) = 1 \\  & Winter swimmers & 2196.2 \(\pm\) 672.4 & 1827.0 \(\pm\) 571.32 & II: F(1, 30) = 2.436; \(p\) = 0.129; \(\eta_{\rm 2}^{2}\) = 0.075 \\  & Winter swimmers & 106.2 \(\pm\) 25.2 & 95.8 \(\pm\) 31.60 & II: F(1, 30) = 35.851; \(p\) = 0.059; \(\eta_{\rm 2}^{2}\) = 0.114 \\ \hline \multirow{2}{*}{Cortisol (\(\mu\)g/dL)} & Control & 153.8 \(\pm\) 76.2 & 160.1 \(\pm\) 88.53 & U(28) = 74; \(p\) = 0.044; \(\mu\)g = 0.422 \\  & Winter swimmers & 225.6 \(\pm\) 151.8 & 170.6 \(\pm\) 70.89 & II: F(1, 30) = 2.874; \(p\) = 0.100; \(\tau_{\rm Hb}\)\({}^{2}\) = 0.087 \\  & & & & IIE(1, 30) = 4.535; \(p\) = 0.042; \(\tau_{\rm Hb}\)\({}^{2}\) = 0.131 \\ \hline \multirow{2}{*}{Dopamine (pmol/L)} & Control & 250.0 \(\pm\) 0.0 & 250.0 \(\pm\) 0.0 & I: U(28) = 120; \(p\) = 0.349; \(\tau\)rb = 0.062 \\  & Winter swimmers & 225.3 \(\pm\) 25.2 & 250.0 \(\pm\) 0.0 & II: NA \\ \hline \multirow{2}{*}{Serotonin (ng/mL)} & Control & 106.6 \(\pm\) 46.8 & 161.7 \(\pm\) 67.79 & I: U(28) = 116; \(p\) = 0.665; \(\tau\)rb = 0.094 \\  & Winter swimmers & 106.2 \(\pm\) 25.2 & 95.8 \(\pm\) 31.60 & II: F(1, 30) = 16.556; \(p\) \(<\) 0.001; \(\tau_{\rm Hb}\)\({}^{2}\) = 0.356 \\ \cline{1-1}  & & & & IIE(1, 30) = 35.399; \(p\) \(<\) 0.001; \(\tau_{\rm Hb}\)\({}^{2}\) = 0.541 \\ \hline \multirow{2}{*}{Cortisol (\(\mu\)g/dL)} & Control & 13.8 \(\pm\) 5.3 & 12.9 \(\pm\) 4.81 & I: t(28) = 0.395; \(p\) = 1.4 \(\pm\) 0.140 \\  & Winter swimmers & 13.1 \(\pm\) 6.1 & 16.0 \(\pm\) 3.56 & II: F(1, 30) = 2.364; \(p\) = 0.135; \(\eta_{\rm 2}^{2}\) = 0.073 \\ \hline \multicolumn{4}{l}{1: results of \(t\)-test/Mann–Whitney test with Bonferroni correction (control vs. winter swimmers in phase 1); II: results of general linear model analyses changes in time [phase 1 vs. phase 3] for overall; III: results of general linear model analyses changes interaction time [phase 1 vs. phase 3] \(\times\) group [winter swimmers vs. control group].} \\ \end{tabular}
\end{table}