## 4 Discussion  
The main aim of the study was to identify the impact of the implementation of an experimental program of synchronized swimming on the times of maintaining apnea in different static positions with and without the use of a nose clip, in girls (age 7-14), divided into four groups according to age category and sports experience. The secondary goal was to identify the correlations between age and sports experience. The results of the study facilitate the expansion of the level of knowledge regarding the level of sports performance and especially the possibilities of developing the functional respiratory capacity in children practicing synchronized swimming. This assessment of the evolution of the ability to maintain breathing in the aquatic environment, assessed by age categories combined with the time interval of practicing synchronized swimming, contributes to the knowledge of the respiratory possibilities of children between 7 and 14 years old, which will offer specialists scientific guidance in the methodical approach to specific training in apneic exercise conditions. Analyzing the results, we find that for only the 7-8-year-old group, apnea maintenance performance is influenced by chronological age, but not by sports experience. In the groups of 9-10, 11-12 and 13-14 years, the apnea capacity correlates statistically significantly with sports experience, but not with chronological age. These results show that age matters only in the initiation stage (7-8 years of age), and subsequently the training methodology and the expansion of the sports experience have an essential and major influence on apnea capacity. \begin{table}
\begin{tabular}{l l l l l l l} \hline \hline
**Group** & **Statistic** & **Effect** & **Value** & **F** & **Hypothesis df** & **Error df** & \(p\) \\ \hline E1 group & Age & 0.071 & 13.069 [FOOTNOTE:]Footnote : Exact statistic, E—experimental group, F—Fisher test, \(p\)—level of probability.[ENDFOOTNOTE]** & 10.000 & 10.000 & 0.000 \\ \cline{3-6}
7–8 years & Sports experience & 0.034 & 2.168 & 30.000 & 30.028 & 0.019 \\ \hline E2 group & \multirow{2}{*}{Wilks’ Lambda} & Age & 0.001 & 566.905 [FOOTNOTE:]Footnote : Exact statistic, E—experimental group, F—Fisher test, \(p\)—level of probability.[ENDFOOTNOTE] & 9.000 & 5.000 & 0.000 \\ \cline{3-6}
9–10 years & & Sports experience & 0.000 & 15.524 & 27.000 & 15.245 & 0.000 \\ \hline E3 group & Age & 0.008 & 53.535 [FOOTNOTE:]Footnote : Exact statistic, E—experimental group, F—Fisher test, \(p\)—level of probability.[ENDFOOTNOTE] & 7.000 & 3.000 & 0.004 \\ \cline{3-6}
11–12 years & Sports experience & 0.000 & 3.011 & 42.000 & 17.523 & 0.008 \\ \hline E4 group & Age & 0.021 & 30.673 [FOOTNOTE:]Footnote : Exact statistic, E—experimental group, F—Fisher test, \(p\)—level of probability.[ENDFOOTNOTE] & 6.000 & 4.000 & 0.003 \\ \cline{3-6}
13–14 years & Sports experience & 0.000 & 3.350 & 66.000 & 26.859 & 0.000 \\ \hline All groups & Age & 0.009 & 31.262 & 30.000 & 232.557 & 0.000 \\ \cline{3-6} \cline{3-6}  & Sports experience & 0.000 & 2.768 & 28.000 & 27.142 & 0.000 \\ \hline \hline \end{tabular}
\end{table} 
Table 8: Wilks’ Lambda of multivariate analysis (MANOVA) between age, experience and results of tests. Following the application of the exercise program specific to apneic breathing, it was found that in all four groups of subjects and for all tests applied, between the initial and final testing, statistically significant progress was registered. These results align with previous studies that concluded that aquatic anaerobic capacity improves through prolonged and repeated apnea exposures, more evidently than in other aquatic sports [24; 25]. In a study, it was highlighted that in preadolescents (10-14 years old), when performing aerobic training, there are no adaptive changes in VO2 max compared to the training stimuli, implying that this improves the size of the heart, and anaerobic capacity develops through anaerobic training [26].