Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
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©Journal of Sports Science and Medicine (2021) 20, 126 - 132   DOI: https://doi.org/10.52082/jssm.2021.126

Research article
The Accuracy of a Low-Cost GPS System during Football-Specific Movements
Emiel Schulze1, , Ross Julian1,2,3, Sabrina Skorski1
Author Information
1 Institute of Sports and Preventive Medicine, Saarland University, Saarbrücken, Germany
2 Institute of Neuromotor Behavior and Exercise, University of Münster, Münster, Germany
3 School of Sport and Exercise, Exercise and Sport Research Centre, University of Gloucestershire, England

Emiel Schulze
✉ Institute of Sports and Preventive Medicine; Saarland University, Campus B8.2, 66123 Saarbrücken, Germany
Email: e.schulze@uni-saarland.de
Publish Date
Received: 07-05-2019
Accepted: 04-01-2021
Published (online): 01-03-2021
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ABSTRACT

An affordable player monitoring solution could make the evaluation of external loading more accessible across multiple levels of football (soccer). The present study aimed to determine the accuracy of a newly designed and low-cost Global Positioning System (GPS) whilst performing match-specific movement patterns. Sixteen professional male football players (24 ± 3 years) were assigned a GPS device (TT01, Tracktics GmbH, Hofheim, Germany) and completed two experimental trials. In each trial, a continuous protocol including seven movements (sideways cornering, diagonal cornering, accelerating, decelerating, backwards jogging, shuttle running, and skipping) adding up to 500 m, was completed. Time-motion data was compared with criterion distance and velocity (photo-cell timing gates and radar). Validity was assessed through the standard error of the estimate (SEE) and reliability through the coefficient of variation (CV; both with 95% confidence limits). For the total distance covered during the protocol, the system was found to be valid (SEE = 3.1% [2.2; 5.8]) and reliable (intra-device CV = 2.0% [1.2; 7.6]). Similar results were found for velocity (SEE = 3.4% [2.6; 4.8], CV = 4.7% [3.2; 8.5]). In conclusion, the present GPS system, a low-cost solution, was found to be a valid and reliable tool for measuring physical loading during football-specific movements.

Key words: Soccer, team sports, external load, precision, motion analysis


           Key Points
  • A newly designed and low-cost GPS system was found to provide reliable and valid data describing physical loading during football-specific movements.
  • The system showed accurate measurements at higher running velocities, potentially due to different positioning of the devices on the body.
  • The system relies on more affordable hardware components, offering a lower financial burden and making it available across a wider range of teams.
 
 
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