## 2 Materials and Methods
### Procedures  
The UWB reference system was installed on the field as follows (Figure 3A): (1) Six antennae with UWB technology were fixed 5 m from the perimeter line of the field, except for those located at the middle line of the field, which were fixed 7 m from the perimeter. This way, the antennae formed a hexagon for better signal emission and reception. All of the antennae were positioned at a height of 3 m and held by a tripod. (2) Once installed, they were switched on one-by-one, with the master antenna turned on last, and a process of autocalibration of the antennae was carried out for 5 min, where the master synchronized all antennas with a common clock. Each time position coordinates were calculated (18 Hz), the master sent a synchronization in time to the rest of antennas [27]. (3), After, the tracking devices were switched on and a process of recognition and automatic communication with the antennae was carried out for 1 min. Each participant was equipped with two lightweight (70 g) inertial devices, each measuring 81 \(\times\) 45 \(\times\) 16 mm. (4) Four devices were placed in the corners of the basketball court on a tripod with a height of 1.85 m (mean height of participants). Data obtained in the previous step were used to establish the perimeter of the court and project it in the SPRO software later. (5) Finally, two inertial devices were placed in a custom vest located on the back of the upper torso, fitted tightly to the body, as is typically used in games. In the custom vest, the devices were placed in parallel (with a separation of 2 cm) and at the same height.  
Data acquisition in the current study was carried out at the \"Sinan Erdem Dome\" Sport Arena (Istanbul, Turkey), measuring 28 \(\times\) 15 m. Five different types of displacement were realized six times for each participant (n = 120 trials performed and 8344 samples) on an official basketball court to represent different directions of movement and different distances, as shown in Figure 4: (b) Perimeter markings of court; (c) middle line of court; (d) exterior perimeter of the painted lines; (e) center circle and (f) 6.75 m line. The actual distances were measured with a trundle wheel ([PERSON], BMI, Hersbruck, Germany). All the tasks started from a standing position. Each task was performed three times for each direction with an interval of at least 5 min of rest between trials. The participants made the different movements shown (Figure 4) according to two criteria: (i) To move only on the lines marked on the basketball court, and (ii) to carry out the movements reaching a speed of \(>\)15 km/h when the course allowed it. However, for the center circle (c) and 6.75 m line (e), it was not possible to reach 15 km/h due to the centrifugal force generated by the curvilinear trajectory. Before beginning the protocols, the athletes performed a standardized 5-min warm-up at aerobic intensity (RPE 5/10) and a 5-min protocol composed of a simulation of the different movements that were to be performed later. In addition, all of the designed courses were practiced during the warm-up. A 10-point Likert-type scale was employed, with 0 being the minimum effort and 10 the maximum of the scale. The warm-up period and the tests were monitored in real time by the S PROTM software to verify that the devices were performing correctly, and that the participants achieved the necessary speed in each trial. When the participants finished the protocols, they performed 5 min of recovery running.