## 2 Materials and Methods
### Relationships between Internal and External Load Indicators  
From the correlation results, it was observed that % HRmax positively correlated with the pace (distance/minute, D/min) (r = 0.540, \(p\) < 0.001). Additionally, a negative correlation was observed with the distances covered by the players in z1 (3935 \(\pm\) 613 m) (r = \(-\)0.442, \(p\) = 0.002). TRIMP\({}_{\rm Edw}\) showed a strong positive correlation with TD (r = 0.547, \(p\) < 0.001) and with zones 1 to 4 (21: r = 0.529, \(p\) < 0.001; z2: r = 0.543, \(p\) < 0.001; z3: r = 0.326, \(p\) = 0.027; z4: r = 0.362, \(p\) = 0.013). In z5 (r = 0.281, \(p\) = 0.058) and in the number of sprints (r = 0.282, \(p\) = 0.057), there was a trend towards positive correlations. In the first half, correlations of % HRmax were observed with TD (r = 0.412, \(p\) = 0.004), D/min (r = 0.391, \(p\) = 0.007), the distance covered in z2 (r = 0.346, \(p\) = 0.019), and the number of Dec2 (r = 0.365, \(p\) = 0.013). TRIMP\({}_{\rm Edw}\) showed a positive correlation with TD (r = 0.338, \(p\) = 0.022) and with z2 (r = 0.429, \(p\) = 0.003). In the second half, correlations of % HRmax were observed with D/min (r = 0.371, \(p\) = 0.011), the distance covered in z2 (r = 0.350,  
Figure 5: **(A). Differences of %HRmax between halves for each playing position. (B). Differences of TRIMP\({}_{\rm Edw}\) load between halves for each playing position. (C). Differences of distance per minute between halves for each playing position. (D). Differences of number of sprints between halves for each playing position. * Denotes a significant difference (\(p\) < 0.05). CD: central defenders, SD: side defenders, CM: central midfielders, SM: side midfielders, F: forwards. **\(p=0.017\)), and the number of Dec2 (r = 0.378, \(p=0.01\)). TRIMPedw showed a positive correlation with most external load indicators (TD: r = 0.887, \(p<0.001\); D/min: r = 0.733, \(p<0.001\); z1: r = 0.857, \(p<0.001\); z2: r = 0.737, \(p<0.001\); z3: r = 0.470, \(p<0.001\); z4: r = 0.322, \(p=0.029\); Dec3: r = 0.384, \(p=0.008\); Dec2: r = 0.654, \(p<0.001\); Acc2: r = 0.642, \(p<0.001\)). All correlation indices are presented in Table 5. \begin{table}
\begin{tabular}{l l l l l l l l} \hline  & \multicolumn{2}{c}{**Full Match**} & \multicolumn{2}{c}{**First Half**} & \multicolumn{2}{c}{**Second Half**} \\  & \multicolumn{1}{c}{**\% HRmax**} & \multicolumn{1}{c}{**TRIMPEdw**} & \multicolumn{1}{c}{**\% HRmax**} & \multicolumn{1}{c}{**TRIMPRaw**} & \multicolumn{1}{c}{**\% HRmax**} & \multicolumn{1}{c}{**TRIMPRaw**} \\ \hline \multirow{3}{*}{TD} & r = \(-\)0.043 & r = 0.547 * & r = 0.412 * & r = 0.338 * & r = 0.274 & r = 0.887 * \\  & \(p=0.074\) & \(p<0.001\) & p = 0.004 & p = 0.022 & p = 0.066 & \(p<0.001\) \\  & r = 0.540 * & r = 0.237 & r = 0.391 * & r = 0.203 & r = 0.371 * & r = 0.733 * \\  & \(p<0.001\) & p = 0.112 & p = 0.007 & p = 0.176 & p = 0.011 & p = 0.001 \\  & r = 0.122 & r = 0.282 & r = 0.036 & r = 0.142 & r = 0.042 & r = 0.030 \\  & \(p=0.419\) & p = 0.057 & p = 0.814 & p = 0.348 & p = 0.781 & r = 0.845 \\  & r = 0.442 * & r = 0.529 * & r = 0.235 * & r = 0.148 & r = 0.096 & r = 0.857 * \\  & \(p=0.002\) & p = 0.001 & p = 0.115 & p = 0.326 & p = 0.526 & p = 0.001 \\  & r = 0.002 & r = 0.543 * & r = 0.346 * & r = 0.429 * & r = 0.350 * & r = 0.737 * \\  & \(p=0.872\) & p = 0.001 & p = 0.019 & p = 0.003 & p = 0.017 & p = 0.001 \\  & r = 0.211 & r = 0.326 * & r = 0.244 & r = 0.095 & r = 0.281 & r = 0.470 * \\  & \(p=0.160\) & p = 0.027 & p = 0.102 & p = 0.529 & p = 0.058 & p = 0.001 \\  & r = 0.259 & r = 0.362 * & r = 0.177 & r = 0.034 & r = 0.241 & r = 0.322 * \\  & \(p=0.082\) & p = 0.013 & p = 0.239 & p = 0.822 & p = 0.107 & p = 0.029 \\  & r = 0.098 & r = 0.281 & r = 0.064 & r = 0.180 & r = 0.037 & r = 0.056 \\  & \(p=0.518\) & p = 0.058 & p = 0.671 & p = 0.230 & p = 0.809 & p = 0.711 \\ \hline \end{tabular}
\end{table} 
Table 5: Correlation of statistical indexes. Figure 6: (**A**). Differences in percentage of heart rate max between positions. (**B**). Differences of TRIMPedw load between positions.