The validity and reliability of 1-Hz and 5-Hz global positioning systems for linear, multidirectional, and soccer-specific activities

Matthew D. Portas, Jamie A. Harley, Christopher A. Barnes, Christopher J. Rush

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Abstract

Purpose: The study aimed to analyze the validity and reliability of commercially available nondifferential Global Positioning System (NdGPS) devices for measures of total distance during linear, multidirectional and soccer-specific motion at 1-Hz and 5-Hz sampling frequencies. Methods: Linear (32 trials), multidirectional (192 trials) and soccer-specific courses (40 trials) were created to test the validity (mean ± 90% confidence intervals), reliability (mean ± 90% confidence intervals) and bias (mean ± 90% confidence intervals) of the NdGPS devices against measured distance. Standard error of the estimate established validity, reliability was determined using typical error and percentage bias was established. Results: The 1-Hz and 5-Hz data ranged from 1.3% ± 0.76 to 3.1% ± 1.37 for validity and 2.03% ± 1.31 to 5.31% ± 1.2 for reliability for measures of linear and soccer-specific motion. For multidirectional activity, data ranged from 1.8% ± 0.8 to 6.88% ± 2.99 for validity and from 3.08% ± 1.34 to 7.71% ± 1.65 for reliability. The 1-Hz underestimated some complex courses by up to 11%. Conclusions: 1-Hz and 5-Hz NdGPS could be used to quantify distance in soccer and similar field-based team sports. Both 1-Hz and 5-Hz have a threshold beyond which reliability is compromised. 1-Hz also underestimates distance and is less valid in more complex courses.
Original languageEnglish
Pages (from-to)448-458
JournalInternational Journal of Sports Physiology and Performance
Volume5
Issue number4
Publication statusPublished - 2010

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Geographic Information Systems
Soccer
Reproducibility of Results
Confidence Intervals
Equipment and Supplies
Sports

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title = "The validity and reliability of 1-Hz and 5-Hz global positioning systems for linear, multidirectional, and soccer-specific activities",
abstract = "Purpose: The study aimed to analyze the validity and reliability of commercially available nondifferential Global Positioning System (NdGPS) devices for measures of total distance during linear, multidirectional and soccer-specific motion at 1-Hz and 5-Hz sampling frequencies. Methods: Linear (32 trials), multidirectional (192 trials) and soccer-specific courses (40 trials) were created to test the validity (mean ± 90{\%} confidence intervals), reliability (mean ± 90{\%} confidence intervals) and bias (mean ± 90{\%} confidence intervals) of the NdGPS devices against measured distance. Standard error of the estimate established validity, reliability was determined using typical error and percentage bias was established. Results: The 1-Hz and 5-Hz data ranged from 1.3{\%} ± 0.76 to 3.1{\%} ± 1.37 for validity and 2.03{\%} ± 1.31 to 5.31{\%} ± 1.2 for reliability for measures of linear and soccer-specific motion. For multidirectional activity, data ranged from 1.8{\%} ± 0.8 to 6.88{\%} ± 2.99 for validity and from 3.08{\%} ± 1.34 to 7.71{\%} ± 1.65 for reliability. The 1-Hz underestimated some complex courses by up to 11{\%}. Conclusions: 1-Hz and 5-Hz NdGPS could be used to quantify distance in soccer and similar field-based team sports. Both 1-Hz and 5-Hz have a threshold beyond which reliability is compromised. 1-Hz also underestimates distance and is less valid in more complex courses.",
author = "Portas, {Matthew D.} and Harley, {Jamie A.} and Barnes, {Christopher A.} and Rush, {Christopher J.}",
year = "2010",
language = "English",
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The validity and reliability of 1-Hz and 5-Hz global positioning systems for linear, multidirectional, and soccer-specific activities. / Portas, Matthew D.; Harley, Jamie A.; Barnes, Christopher A.; Rush, Christopher J.

In: International Journal of Sports Physiology and Performance, Vol. 5, No. 4, 2010, p. 448-458.

Research output: Contribution to journalArticleResearchpeer-review

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