## 3 Materials and Methods
### Variables  
The independent variables of the study were the following: (1) participation type (i.e., consecutive (organization in rows and students participating one by one) and simultaneous (groups organization and all students participating at the same time)), where the type of participation was linked to the teaching style employed by the teacher. Thus, in the direct command teaching style, students would be grouped in rows, and with the assignment of tasks, the organization of students was more flexible (simultaneous) [29]. (2) The total task time was established in three categories: \(<\)6 min, 6-10 min, and \(>\)10 min. Finally, there was (3) the game situation, which was grouped into five categories: task without opposition (e.g., 1 vs. 0 or 2 vs. 0), individual game with opposition (i.e., 1 vs. 1), numerical inequality SSGs (e.g., 2 vs. 1 or 3 vs. 2), numerical equality SSGs (e.g., 2 vs. 2 or 3 vs. 3), and full games (i.e., 5 vs. 5) [30]. SSGs refer to Small-Sided Games, while full games refer to more realistic game situations [31].  
Figure 1: Attack and defense contents developed in practical sessions. Note: SSG = Small-Sided Games. 1 RealTrack System, Almeria, Spain. The percentage on the left refers to the total time of the task, while the percentage on the right refers to the type of participation and indicates the most used category in each variable.  
A total of 18 dependent variables were recorded in this study, grouped into eTL and iTL variables. The kinematic variables of the eTL used were the (1) number of accelerations (Acc), (2) accelerations per minute (Acc/min), (3) maximum acceleration (Accmax), (4) average acceleration (Accavg), (5) number of decelerations (Dec), (6) decelerations per minute (Dec/min), (7) maximum deceleration (Decmax), and (8) average deceleration (Decavg). The neuromuscular variables of the eTL were the (1) integral PL (PL) (i.e., the total accelerations produced in the three planes of motion) and (2) integral PL per minute (PL/min).  
The Acc/min and Dec/min variables quantified the velocity changes, both positive and negative, during sports practice. They were calculated using the following formula [32]:  
\[\overline{\text{a}}=\frac{v-v_{0}}{t}\]  
In addition, the _PL_ variable was calculated from the accelerations through the following formula [9]:  
\[PL_{n}=\frac{\sqrt{\left(\text{x}_{n}-\text{x}_{n-1}\right)^{2}+\left(\text{ y}_{n}-\text{y}_{n-1}\right)^{2}+\left(\text{z}_{n}-\text{z}_{n-1}\right)^{2}}}{100}\]  
The iTL variables recorded were the (1) maximum HR (HRmax), (2) average HR (HRavg), (3) percentage of time spent in the 50-60% HR range (50-60% HRmax), (4) percentage of time spent in the 60-70% HR range (60-70% HRmax), (5) percentage of time spent in the 70-80% HR range (70-80% HRmax), (6) percentage of time spent in the 80-90% HR range (80-90% HRmax), (7) percentage of time spent in the 90-95% HR range (90-95% HRmax), and (8) percentage of time spent in the 95-200% HR range (95-200% HRmax). Each of these ranges corresponded to a different HR zone (1-6, respectively). According to the age of the participants, the HRmax recorded by the HR monitors was 201 beats per minute (bpm), coinciding with the scientific literature indicating that the maximum HR in children can be higher than 200 bpm [13,33].  
It was necessary to know the percentage of time that the students spent in the different HR zones. These zones depended on the intensity of the motor activity performed. The MVPA (50-70% HRmax; 100.50-140.70 bpm) and VPA (70-85% HRmax; 140.70-170.85 bpm) were also calculated using the HRmax variable. This variable could be used as an indicator for the determination and dosage of physical activity.