## 4 Discussion
\begin{table}
\begin{tabular}{c c c} \hline \hline
**Variables** & **SC** & **Boyd** \\  & & **et al.**[27] \\ \hline \multirow{4}{*}{Maximum heart rate (bpm)} & C5/6 & 196 \(\pm\) 18 \\  & C7 & 194 \(\pm\) 11 \\  & C8 & 200 \(\pm\) 6 \\  & TOTAL & 197 \(\pm\) 12 \\ \hline \multirow{4}{*}{Average heart rate (bpm)} & C5/6 & 161 \(\pm\) 20 \({}^{\text{a}}\) 157 \(\pm\) 19 \({}^{\text{b}}\) 153 \(\pm\) 19 \({}^{\text{c}}\) 158 \(\pm\) 18 \({}^{\text{d}}\) \\  & C7 & 164 \(\pm\) 14 \({}^{\text{a}}\) 166 \(\pm\) 13 \({}^{\text{b}}\) 159 \(\pm\) 14 \({}^{\text{c}}\) 160 \(\pm\) 13 \({}^{\text{d}}\) \\  & C8 & 170 \(\pm\) 5 \({}^{\text{a}}\) 171 \(\pm\) 7 \({}^{\text{b}}\) 168 \(\pm\) 7 \({}^{\text{c}}\) 169 \(\pm\) 10 \({}^{\text{d}}\) \\  & TOTAL & 165 \(\pm\) 13 \({}^{\text{a}}\) 165 \(\pm\) 13 \({}^{\text{b}}\) 160 \(\pm\) 13 \({}^{\text{c}}\) 162 \(\pm\) 14 \({}^{\text{d}}\) \\ \hline \multirow{4}{*}{Time \textless{75\% Maximum} HR (min)} & C5/6 & 3.5 \({}^{\text{a}}\) 1.5 \({}^{\text{b}}\) 1.5 \({}^{\text{c}}\) 1.8,0 \({}^{\text{d}}\) \\  & C7 & 2.3 \({}^{\text{a}}\) 1.8 \({}^{\text{b}}\) 1.3 \({}^{\text{c}}\) 1.2 \({}^{\text{d}}\) \\  & C8 & 1.0 \({}^{\text{a}}\) 1.6 \({}^{\text{b}}\) 1.9 \({}^{\text{c}}\) 1.2 \({}^{\text{g}}\) 1.9 \({}^{\text{d}}\) \\ \hline \multirow{4}{*}{Time between 75–85\% Maximum HR (min)} & C5/6 & 4.4 \({}^{\text{a}}\) 1.7 \({}^{\text{b}}\) 1.5 \({}^{\text{c}}\) 1.3 \({}^{\text{g}}\) \\  & C7 & 6.0 \({}^{\text{a}}\) 1.6 \({}^{\text{b}}\) 1.6 \({}^{\text{c}}\) 1.7 \({}^{\text{d}}\) \\  & C8 & 3.9 \({}^{\text{a}}\) 1.4 \({}^{\text{b}}\) 1.5 \({}^{\text{b}}\) 1.3 \({}^{\text{d}}\) \\ \hline \multirow{4}{*}{Time \textgreater{85\% Maximum} HR (min)} & C5/6 & 7.1 \({}^{\text{a}}\) 1.5 \({}^{\text{b}}\) 1.4 \({}^{\text{a}}\) 1.3 \({}^{\text{d}}\) \\  & C7 & 6.6 \({}^{\text{a}}\) 1.7 \({}^{\text{b}}\) 1.4 \({}^{\text{c}}\) 1.4 \({}^{\text{c}}\) 1.4 \({}^{\text{d}}\) \\ \cline{1-1}  & C8 & 10.4 \({}^{\text{a}}\) 19.4 \({}^{\text{b}}\) 1.8 \({}^{\text{c}}\) 1.9 \({}^{\text{d}}\) \\ \hline \hline \end{tabular} Note: SC = sport class; \({}^{\text{a}}\) = between 0–15 min of the match; \({}^{\text{b}}\) = between 16–30 min of the match; \({}^{\text{c}}\) = between 31–45 min of the match; \({}^{\text{d}}\) = between 46–60 min of the match.  
\end{table} 
Table 7: Results for measures of physiological responses extracted from literature research of studies on para-footballers with cerebral palsy. great variability existing among players in terms of muscle glycogen, free fatty acid levels, insulin levels, and so forth, during a game [36]. On the other hand, it could be because CP players with less physical impairment have higher levels of physical fitness [37]. Therefore, despite demonstrating higher physical performance (i.e., covering greater total distance and distance at high speeds), their physiological response during matches is similar, as occurs in non-disabled soccer players [38]. However, the relationship between physical fitness and match running performance was shown to be playing position-dependent [39] and, therefore, more studies with CP players are necessary to analyze this aspect. Only one study included in the review analyzes the total distance covered in absolute terms dividing the sample by sport classes [27]. This study indicates that total distance covered was 6343 \(\pm\) 551 m, 5642 \(\pm\) 674 m, and 5532 \(\pm\) 814 m for classes C8, C7, and C5/6, respectively [27]. The highest values of total distance covered in relative terms in para-footballers were 106.42 \(\pm\) 9.59 m\(\cdot\)min\({}^{-1}\), 95.56 \(\pm\) 11.05 m\(\cdot\)min\({}^{-1}\), and 60.55 \(\pm\) 23.62 m\(\cdot\)min\({}^{-1}\) for FT3, FT2, and FT1, respectively [28; 29]. Therefore, the total distance covered seems to be related to the degree of physical impairment of footballers with CP [27; 28; 29], as the para-footballers with minimal impairment are the ones who complete the greatest total distance in absolute terms and per minute of play.