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Quantifying change of direction load using positional data from small-sided games in soccer.

Brenda M T Merks1, Wouter G P Frencken1,2, A R Den Otter1

  • 1Center for Human Movement Sciences, University Medical Center, University of Groningen, Groningen, Netherlands.

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Summary

This study validates a new measure of change of direction (COD) load using small-sided games (SSG) in elite youth soccer players. The COD load measure demonstrated strong criterion and construct validity, correlating well with other performance indicators.

Keywords:
Agilityloadlocal positioningsmall-sided games

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Area of Science:

  • Sports Science
  • Biomechanics
  • Soccer Performance Analysis

Background:

  • Accurate quantification of change of direction (COD) load is crucial for understanding soccer player exertion.
  • Small-sided games (SSG) are commonly used training methods, but their impact on COD load requires further investigation.
  • Positional data offers a promising avenue for objective load measurement during SSG.

Purpose of the Study:

  • To quantify change of direction (COD) load using positional data during small-sided games (SSG).
  • To assess the criterion and construct validity of this COD load measure in elite male youth soccer players.

Main Methods:

  • Twenty-five elite male youth soccer players participated in three SSG with varying field dimensions.
  • Positional data was collected using a Local Position Measurement system.
  • COD load was calculated based on velocity and changes in heading direction, with criterion and construct validity assessed against other load indicators and field sizes.

Main Results:

  • A strong correlation was found between COD load and total distance covered (r=0.74) and running distance (r=0.84).
  • Larger field dimensions (medium and large) resulted in a significantly higher COD load compared to smaller fields.
  • The COD load measure showed significant differences across varying SSG field sizes.

Conclusions:

  • The developed COD load measure exhibits sufficient criterion validity, correlating strongly with established running load indicators.
  • The COD load measure demonstrates adequate construct validity, with sensitivity to changes in SSG field dimensions.
  • This validated COD load measure can be effectively utilized in SSG to monitor soccer player training load.