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Concurrent Validity and Interunit Reliability of 25-Hz GNSS Units for Profiling Sprinting Performance.

Louis Dennison1, Grant M Duthie1,2, Fabian Ehrmann3

  • 1Faculty of Behavioural and Health Sciences, Australian Catholic University, Strathfield, New South Wales, Australia.

Journal of Strength and Conditioning Research
|October 24, 2024
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Summary
This summary is machine-generated.

New 25-Hz Global Navigation Satellite System (GNSS) units accurately measure sprint performance, offering a reliable and cost-effective alternative for coaches. These devices provide valid and consistent data for athletic development during training and competition.

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Area of Science:

  • Sports Science
  • Biomechanics
  • Performance Analysis

Background:

  • Accurate sprint profiling is essential for athlete development.
  • Traditional measurement systems are often expensive or impractical for field use.
  • Higher sampling rate Global Navigation Satellite System (GNSS) units may offer a solution.

Purpose of the Study:

  • To evaluate the concurrent validity of 25-Hz GNSS units against criterion devices.
  • To assess the interunit reliability of 25-Hz GNSS units.
  • To determine the agreement of GNSS units for velocity and sprint time measurements.

Main Methods:

  • Concurrent validity assessed using 30 athletes performing maximal 40-meter sprints with simultaneous measurement by GNSS, laser devices, and timing gates.
  • Interunit reliability tested using three GNSS units on a vehicle during 60 accelerations (0-60 m).
  • Statistical analysis included bias, typical error, and intraclass correlation coefficients (ICC).

Main Results:

  • Low mean bias (<1%) and typical error (<2%) demonstrated excellent agreement between GNSS and criterion devices.
  • Good to excellent interunit reliability was found for all interval times (0-10m to 10-60m), total sprint times (0-60m), and maximal sprint velocity (ICC values ranging from 0.86 to 1.0).
  • The 25-Hz GNSS units showed high validity and reliability for profiling sprinting performance.

Conclusions:

  • 25-Hz GNSS units are a valid, reliable, and feasible alternative to traditional sprint measurement devices.
  • This technology enables scalable, concurrent assessment of multiple athletes' sprint performance in field settings.
  • Coaches can utilize GNSS data for evidence-based decisions in athletic development and training.