Validity and interunit reliability of 10 Hz and 15 Hz GPS units for assessing athlete movement demands

Johnston, RJ; Watsford, ML; Kelly, SJ; Pine, MJ; Spurrs, RW

Validity and interunit reliability of 10 Hz and 15 Hz GPS units for assessing athlete movement demands

Johnston, RJ Watsford, ML

Kelly, SJ Pine, MJ Spurrs, RW

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Publication Type:: Journal Article
Citation:: Journal of Strength and Conditioning Research, 2014, 28 (6), pp. 1649 - 1655
Issue Date:: 2014-01-01

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Field	Value	Language
dc.contributor.author	Johnston, RJ	en_US
dc.contributor.author	Watsford, ML https://orcid.org/0000-0002-4569-6377	en_US
dc.contributor.author	Kelly, SJ	en_US
dc.contributor.author	Pine, MJ	en_US
dc.contributor.author	Spurrs, RW	en_US
dc.date.issued	2014-01-01	en_US
dc.identifier.citation	Journal of Strength and Conditioning Research, 2014, 28 (6), pp. 1649 - 1655	en_US
dc.identifier.issn	1064-8011	en_US
dc.identifier.uri	http://hdl.handle.net/10453/36868
dc.description.abstract	The purpose of this study was to assess the validity and interunit reliability of 10 Hz (Catapult) and 15 Hz (GPSports) Global Positioning System (GPS) units and investigate the differences between these units as measures of team sport athlete movement demands. A team sport simulation circuit was completed by 8 trained male participants. The movement demands examined included: total distance covered (TD), average peak speed, and the distance covered, time spent, and the number of efforts performed low-speed running (0.00-13.99 km·h-1), high-speed running (14.00-19.99 km·h-1), and very highspeed running (>20.00 km·h-1). The degree of difference between the 10 Hz and the 15 Hz GPS units and validity was assessed using a paired samples t-test. Pearson's correlations were also used for validity assessment. Interunit reliability was established using percentage typical error of measurement (%TEM) and intraclass correlations. The findings revealed that 10 Hz GPS units were a valid (p > 0.05) and reliable (%TEM = 1.3%) measure of TD. In contrast, the 15 Hz GPS units exhibited lower validity for TD and average peak speed. Further, as the speed of movement increased the level of error for the 10 Hz and 15 Hz GPS units increased (% TEM = 0.8-19.9). The findings from this study suggest that comparisons should not be undertaken between 10 Hz and 15 Hz GPS units. In general, the 10 Hz GPS units measured movement demands with greater validity and interunit reliability than the 15 Hz units, however, both 10 Hz and 15 Hz units provided the improved measures of movement demands in comparison to 1 Hz and 5 Hz GPS units. © 2014 National Strength and Conditioning Association.	en_US
dc.relation.ispartof	Journal of Strength and Conditioning Research	en_US
dc.relation.isbasedon	10.1519/JSC.0000000000000323	en_US
dc.subject.classification	Sport Sciences	en_US
dc.subject.mesh	Humans	en_US
dc.subject.mesh	Pilot Projects	en_US
dc.subject.mesh	Reproducibility of Results	en_US
dc.subject.mesh	Movement	en_US
dc.subject.mesh	Geographic Information Systems	en_US
dc.subject.mesh	Adult	en_US
dc.subject.mesh	Male	en_US
dc.subject.mesh	Athletic Performance	en_US
dc.title	Validity and interunit reliability of 10 Hz and 15 Hz GPS units for assessing athlete movement demands	en_US
dc.type	Journal Article
utslib.citation.volume	6	en_US
utslib.citation.volume	28	en_US
utslib.for	110699 Human Movement and Sports Science not elsewhere classified	en_US
utslib.for	110602 Exercise Physiology	en_US
utslib.for	1106 Human Movement and Sports Sciences	en_US
utslib.for	1116 Medical Physiology	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Health
pubs.organisational-group	/University of Technology Sydney/Faculty of Health/Sports and Exercise Science
pubs.organisational-group	/University of Technology Sydney/Strength - CHSP - Health Services and Practice
pubs.organisational-group	/University of Technology Sydney/Students
utslib.copyright.status	open_access
pubs.issue	6	en_US
pubs.publication-status	Published	en_US
pubs.volume	28	en_US

Abstract:

The purpose of this study was to assess the validity and interunit reliability of 10 Hz (Catapult) and 15 Hz (GPSports) Global Positioning System (GPS) units and investigate the differences between these units as measures of team sport athlete movement demands. A team sport simulation circuit was completed by 8 trained male participants. The movement demands examined included: total distance covered (TD), average peak speed, and the distance covered, time spent, and the number of efforts performed low-speed running (0.00-13.99 km·h-1), high-speed running (14.00-19.99 km·h-1), and very highspeed running (>20.00 km·h-1). The degree of difference between the 10 Hz and the 15 Hz GPS units and validity was assessed using a paired samples t-test. Pearson's correlations were also used for validity assessment. Interunit reliability was established using percentage typical error of measurement (%TEM) and intraclass correlations. The findings revealed that 10 Hz GPS units were a valid (p > 0.05) and reliable (%TEM = 1.3%) measure of TD. In contrast, the 15 Hz GPS units exhibited lower validity for TD and average peak speed. Further, as the speed of movement increased the level of error for the 10 Hz and 15 Hz GPS units increased (% TEM = 0.8-19.9). The findings from this study suggest that comparisons should not be undertaken between 10 Hz and 15 Hz GPS units. In general, the 10 Hz GPS units measured movement demands with greater validity and interunit reliability than the 15 Hz units, however, both 10 Hz and 15 Hz units provided the improved measures of movement demands in comparison to 1 Hz and 5 Hz GPS units. © 2014 National Strength and Conditioning Association.

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http://hdl.handle.net/10453/36868