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Int J Sports Med. 2015 Jan;36(1):49-53. doi: 10.1055/s-0034-1385866. Epub 2014 Sep 25.

Accuracy of GPS devices for measuring high-intensity running in field-based team sports.

Author information

1
S. S. MAPEI srl, Human Performance Laboratory, Olgiate Olona, Italy.
2
Department of Biomedical Sciences for Health, Università degli Studi di Milano, Milano, Italy.
3
Faculty of Exercise Sciences, Department of Sport, Università degli Studi di Milano, Nutrition and Health Sciences, Milan, Italy.
4
S. S. MAPEI srl, Human Performance Laboratory, Castellanza, Italy.
5
Training Check Juventus, Juventus Football Club, Turin, Italy.
6
School of Leisure, Sport & Tourism, University of Technology, Sydney, Australia.
7
School of Leisure, Sport & Tourism, University of Technology, Sydney, Lindfield, Australia.

Abstract

We compared the accuracy of 2 GPS systems with different sampling rates for the determination of distances covered at high-speed and metabolic power derived from a combination of running speed and acceleration. 8 participants performed 56 bouts of shuttle intermittent running wearing 2 portable GPS devices (SPI-Pro, GPS-5 Hz and MinimaxX, GPS-10 Hz). The GPS systems were compared with a radar system as a criterion measure. The variables investigated were: total distance (TD), high-speed distance (HSR>4.17 m·s(-1)), very high-speed distance (VHSR>5.56 m·s(-1)), mean power (Pmean), high metabolic power (HMP>20 W·kg(-1)) and very high metabolic power (VHMP>25 W·kg(-1)). GPS-5 Hz had low error for TD (2.8%) and Pmean (4.5%), while the errors for the other variables ranged from moderate to high (7.5-23.2%). GPS-10 Hz demonstrated a low error for TD (1.9%), HSR (4.7%), Pmean (2.4%) and HMP (4.5%), whereas the errors for VHSR (10.5%) and VHMP (6.2%) were moderate. In general, GPS accuracy increased with a higher sampling rate, but decreased with increasing speed of movement. Both systems could be used for calculating TD and Pmean, but they cannot be used interchangeably. Only GPS-10 Hz demonstrated a sufficient level of accuracy for quantifying distance covered at higher speeds or time spent at very high power.

PMID:
25254901
DOI:
10.1055/s-0034-1385866
[Indexed for MEDLINE]
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