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Related Experiment Videos

The yo-yo intermittent recovery test: physiological response, reliability, and validity.

Peter Krustrup1, Magni Mohr, Tommas Amstrup

  • 1Institute of Exercise and Sport Sciences, August Krogh Institute, Department of Human Physiology, University of Copenhagen, Denmark.

Medicine and Science in Sports and Exercise
|April 4, 2003
PubMed
Summary

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The Yo-Yo intermittent recovery test demonstrates high reproducibility and accurately assesses elite soccer players' fitness, reflecting both aerobic and anaerobic demands. Performance on this test correlates with in-game high-intensity running.

Area of Science:

  • Sports Science
  • Exercise Physiology

Background:

  • The Yo-Yo intermittent recovery test is widely used to assess the fitness of athletes in intermittent sports.
  • Understanding its physiological response and reproducibility is crucial for its effective application.

Purpose of the Study:

  • To evaluate the physiological responses during the Yo-Yo intermittent recovery test.
  • To determine the test-retest reproducibility of the Yo-Yo test.
  • To assess its applicability and validity in elite soccer players.

Main Methods:

  • Physiological measurements (heart rate, blood and muscle metabolites) were taken before, during, and after the Yo-Yo test in male participants.
  • The Yo-Yo test was retested, and an exhaustive incremental treadmill test (ITT) was conducted for comparison.

Related Experiment Videos

  • Elite soccer players underwent seasonal Yo-Yo tests, with results correlated to match physical performance.

    • Main Results:

    • The Yo-Yo test exhibited high reproducibility (CV 4.9%) with peak heart rates similar to the ITT but higher peak blood lactate.
    • Muscle lactate significantly increased, while creatine phosphate (CP) and glycogen decreased during the Yo-Yo test.
    • Yo-Yo test performance and maximal oxygen uptake ([OV0312]O(2max)) improved in elite soccer players during the precompetition period, with Yo-Yo performance correlating to high-intensity match running.

    Conclusions:

    • The Yo-Yo intermittent recovery test is a reproducible and sensitive tool for analyzing the physical capacity of athletes in intermittent sports.
    • It serves as a valid measure of fitness in soccer, taxing both aerobic and anaerobic energy systems.
    • Fatigue in intense intermittent exercise appears independent of muscle CP, lactate, pH, and glycogen levels.