The Accuracy of a Low-Cost GPS System during Football-Specific Movements.
J Sports Sci Med
; 20(1): 126-132, 2021 03.
Article
in En
| MEDLINE
| ID: mdl-33707995
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
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Soccer
/
Geographic Information Systems
/
Data Accuracy
/
Movement
Type of study:
Health_economic_evaluation
Limits:
Adult
/
Humans
/
Male
Language:
En
Journal:
J Sports Sci Med
Year:
2021
Document type:
Article
Affiliation country:
Germany