## 3 Results
### Fat Tissue  
Throughout the entire study period, EPA children had, on average, lower body fat content than SPA ones. In EPA, there was an average decrease in FM from 28.65% to 26.41% (\(p=0.014\)), and in SPA, there was an average increase from 30.31% to 31.75% (\(p=0.025\)) (Figure 1). FM increased in SPA by an average of 1.44%, and in EPA, it decreased by 2.24% (\(p=0.000\)). In SPA girls, FM increased by 5.3 kg and in EPA, this increased by 3.22 kg (\(p=0.001\)). In SPA girls, FM increased from 31.62% to 32.65% (\(p=0.025\)), and in EPA girls, it decreased from 32.02% to 30.02% (\(p=0.000\)) (Table 3). The highest average increase in adipose tissue was recorded in SPA boys, and the lowest was recorded in EPA boys (Table 4). In EPA boys, FM decreased by 3.4%, and in SPA boys, it increased by nearly 2%. Girls had higher FMs than boys (31.33% vs. 27.23%, respectively; \(p=0.000\)). The highest increase in FM occurred  
\begin{table}
\begin{tabular}{c c c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Indicator**} & \multicolumn{4}{c}{**SPA**} & \multicolumn{4}{c}{**EPA**} & \multirow{2}{*}{**Total \(p\)**} \\ \cline{2-2} \cline{4-2}  
in SPA boys (2%), and the highest decrease was in EPA boys (3.4%). In EPA children, a decrease in body fat content was observed from 91 c to 85 c in boys and from 91 c to 85 c in girls (\(p\) = 0.000), while in SPA children, an increase was observed from 91 c to 95 c in girls. Detailed FM values for particular measurement sessions are presented in Table 5.  
The assessment of body fat content (FM) in children was interpreted based on percentile charts, where the excess FM was \(\geq\)85 percentile [17]. During the entire study period, overweight related to FM occurred in almost 68% of girls, including 60% of SPA girls and 75% of EPA girls (\(p\) = 0.001), and about 69% of boys, namely 53% and 84%, respectively (\(p\) = 0.000). FM obesity was observed among 43.5% of SPA children, including 47% of boys and 40% of girls (\(p\) = 0.001) and 20.5% of EPA children, namely 16% of boys and 25% of girls, respectively (\(p\) = 0.000). In EPA children, a decrease in the percentage of children with obesity was noted from 33.5% to 15%, while in SPA children, this was from 58.8% to 44.50% (\(p\) = 0.000). Similarly to BMI, during the study period, one girl in the SPA group and two girls and four boys in the SPA group decreased their FM category from excess FM to normal FM (\(p\) = 0.001). No one changed their FM category from obesity to normal FM. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**Indicator**} & \multicolumn{4}{c}{**SPA**} & \multicolumn{4}{c}{**EPA**} \\ \cline{2-7}  & **Initial** & **Final** & \(p\) & **Initial** & **Final** & \(p\)** \\ \hline FM (kg) & 17.39 & 23.19 & 0.001 & 12.43 & 13.76 & 0.001 \\ FM (\%) & 29 & 30.85 & 0.000 & 26.20 & 22.80 & 0.000 \\ FM (percentile, c) & 95 & 95 & 0.452 & 91 & 85 & 0.000 \\ FFM (kg) & 42.58 & 51.98 & 0.014 & 35.66 & 46.61 & 0.014 \\ FFM (\%) & 71 & 69.11 & 0.001 & 73.80 & 77.20 & 0.001 \\ TBW (kg) & 30.73 & 37.77 & 0.025 & 25.64 & 33.31 & 0.000 \\ TBW (\%) & 51.25 & 50.25 & 0.012 & 54.56 & 55.70 & 0.045 \\ SMM (kg) & 22.89 & 29.84 & 0.024 & 20.57 & 33.07 & 0.001 \\ SMM (\%) & 39.05 & 40.46 & 0.071 & 42.01 & 45.45 & 0.001 \\ \hline \hline \end{tabular}  
* EPA—elevated PA group; SPA—standard PA group; FM—fat mass (in kg); c—percentile corresponding to fat mass percentile charts; FFM—fat-free mass; TBW—total body water; SMM—skeletal muscle mass; \(p\)—ANOVA; \(p\leq 0.05\).  
\end{table} 
Table 4: Comparison of the body composition of overweight boys between the initial and final measurements.