Department of Physical Activity and Sport, University of Murcia, Murcia, Spain.
BioVetMed & SportSci Research Group, University of Murcia, Murcia, Spain.
Sports Biomech. 2024 Feb;23(2):145-155. doi: 10.1080/14763141.2020.1830162. Epub 2020 Nov 18.
Validity and reliability have become crucial factors in tracking player load and positioning. One of the most important parameters to guarantee accurate measurements with radiofrequency systems is the number of reference nodes used to calculate player position. However, the accuracy of ultra-wideband (UWB) technology has only been analysed with 6 antennae. So, the purpose of the present study was to analyse the accuracy and inter-unit reliability of an UWB system with eight antennae. Three well-trained males covered 18 trajectories for the analysis of x- and y- coordinate accuracy assessment related to the positional variation among eight antennae UWB data and lines on a basketball court. This was achieved using geographical information system mapping software that calculated, for each interval and participant, the distance from the main axis of locomotion and the opposite side of the field every 0.5 s. The results showed that this is a valid system (Mean = 0.03 m; magnitude differences = 0.21% with real measures as reference; %CV <1% in all cases) for measuring locomotion and positioning. Besides, the inter-unit, test-retest and inter-subject analysis did not influence the reliability results. So, an eight antennae UWB system can be considered suitable for locomotion and positioning in an indoor environment.
有效性和可靠性已成为跟踪球员负荷和位置的关键因素。在使用射频系统保证准确测量时，最重要的参数之一是用于计算球员位置的参考节点数量。然而，超宽带 (UWB) 技术的准确性仅使用 6 个天线进行了分析。因此，本研究的目的是分析具有 8 个天线的 UWB 系统的准确性和单元间可靠性。3 名训练有素的男性覆盖了 18 条轨迹，用于分析与 8 个天线 UWB 数据和篮球场上的线之间位置变化相关的 x 和 y 坐标精度评估，以及各间隔和参与者的位置变化。这是通过地理信息系统映射软件实现的，该软件为每个间隔和参与者计算了从主运动轴和场地另一侧的距离，每 0.5 秒计算一次。结果表明，该系统（Mean=0.03 m；与真实测量值的幅度差异=0.21%；在所有情况下的 CV%<1%）适用于测量运动和定位。此外，单元间、测试-重测和受试者间分析并不影响可靠性结果。因此，八天线 UWB 系统可用于室内环境中的运动和定位。
