Investigation of the convergent validity and reliability of unit position differences of Catapult S5 GPS units in field conditions

Abstract

This research aimed to examine the validity and reliability of GPS units located in different positions. Nine recreational soccer players (age: 23.18 ± 2.21 years; height: 176 ± 7.65 cm; and body mass: 71.13 ± 4.67 kg) participated voluntarily in the current study. Athletes were tested through the team sports simulation cycle (TSSC) protocol. This protocol consisted of a total of 1200 m. Each lap consisted of a distance of 150 m, and the athletes were asked to perform eight laps. Two GPS units (OptimEye S5; Catapult Innovations, Scoresby, Victoria) were used for each athlete during the TSSC protocol. The first unit was positioned in the scapula location, and the other GPS unit was positioned in the center of mass (COM) location, and simultaneous data were recorded. A paired-samples t-test was used to determine the difference between the meter values measured in the field and the devices. The main finding of this research was that the player load parameters, which are derived from the accelerometer in GPS units, changes with the player’s position (total player load scapula − total player Load COM p≤ 0.001, Cohen’ d−2.449). There was no statistical difference between the other parameters (total distance covered, max velocity, deceleration max and acceleration max) examined in the study. CV% and SWC values showing the reliability of total distance covered scapula (CV% = 1.41; SWC = 0.28), total distance covered COM (CV% = 3.64; SWC = 0.73), total player load scapula (CV% = 2.29; SWC = 0.46), total player load COM (CV% = 1.83; SWC = 0.37), deceleration max scapula (CV% = 3.51; SWC = 0.70), deceleration max COM (CV% = 2.78; SWC = 0.56), Acceleration max scapula (CV% = 3.85; SWC = 0.77), and acceleration max COM (CV% = 2.74; SWC = 0.55) were within acceptable limits (CV% 5). The reliability of GPS units in different locations was investigated by CV% SWC analysis. It was found that all values in the scapula and COM locations were measured validly and reliably, but the total player load measurements were statistically different in the scapula and COM.

Validity and reliability of Polar M400 GPS watches for measuring distances covered by team sports players

“…One Way ANOVA with Bonferroni post hoc test was used to compare differences between the different sessions and the two separate GPS watches. Percentage coefficients of variation (%CV) were calculated using the formula standard error of mean/mean*100 [ 26 , 27 ]. CV% and SWC tests were used to measure the intra-GPS watch's reliability of the data.…”

Control del entrenamiento con datos GPS y medidas subjetivas de fatiga y recuperación en futbolistas hondureños durante un periodo preparatorio para los Juegos Olímpicos de Tokio 2020/2021

“…Las unidades Catapult Optimeye S5 se activaron 15 minutos antes del comienzo de cada sesión y se colocaron en la parte superior de la espalda de cada jugador mediante un chaleco diseñado a medida (Catapult Vest; Ventou Garment Technology, Melbourne, Australia). La ubicación de la escápula ha demostrado tener una confiabilidad en la distancia recorrida total (% coeficiente de variación = 1.41; mínimo cambio detectable = 0.28) (Akyildiz et al, 2022), el dispositivo Catapult OptimEye S5 muestra una excelente confiabilidad con variaciones de CCI 0.77 (IC del 95 %: 0.62 a 0.89) (muy grande) a 1.0 (IC del 95 %: 0.99 a 1.0) (casi perfecto) (Nicolella et al, 2018). Después de cada recopilación de datos, estos mismos fueron descargados de los dispositivos Optimeye S5 a una computadora.…”

Dose-Response Relationship for External Workload and Neuromsuclar Performance Over a Female, Collegiate, Basketball Season

“…Summary metrics using proprietary algorithms, based on the previously mentioned movement characteristics, are used to acquire a general idea of the total workload achieved during a training session or competition. Based on the software and manufacturer, such summary metrics are often referred to as total player load, accumulated acceleration load (AAL), or mechanical load (1,41). However, these summary metrics have previously received some criticism, largely stemming from the fact that they report workload in arbitrary units, making it difficult to interpret data, especially if different systems and technologies are being used to quantify external workload (14).…”