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Interunit Reliability and Effect of Data-Processing Methods of Global Positioning Systems.

Heidi R Thornton, André R Nelson, Jace A Delaney

International Journal of Sports Physiology and Performance

|September 12, 2018

Summary

This summary is machine-generated.

Global Positioning System (GPS) devices show good interunit reliability for movement indicators like distance and speed. However, significant differences exist between manufacturers and data processing methods, necessitating standardized protocols for accurate sports performance analysis.

Keywords:

GPS devices external load manufacturer microtechnology monitoring

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Area of Science:

Sports Science
Biomechanics
Human Movement Analysis

Background:

Global Positioning System (GPS) technology is widely used in sports for performance monitoring.
Variability in GPS unit reliability and data processing can impact the accuracy of movement indicators.
Understanding these variations is crucial for coaches and sports scientists.

Purpose of the Study:

To assess the interunit reliability of various GPS-derived movement indicators.
To compare data consistency across different GPS manufacturers.
To evaluate discrepancies between raw and software-processed GPS data.

Main Methods:

27 GPS units from three manufacturers (GPSports, STATSports, Catapult) were tested.
Units measured identical team-sport simulation sessions on a sled.
Interunit reliability was quantified using coefficient of variation; differences were assessed using standardized effect sizes.

Main Results:

Interunit reliability varied from good to poor, with distance, speed, and maximal speed being most reliable.
Substantial differences in movement indicators were found between manufacturers.
Significant variations were also observed between raw and software-processed data.

Conclusions:

Most GPS-derived movement indicators demonstrate acceptable interunit reliability.
Practitioners can generally trust the data within systems.
Standardized data processing is recommended due to significant manufacturer-specific output differences.