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Test-retest reliability of performance variables during treadmill rollerski skating.

Thomas Losnegard1,2, Paul André Solberg3, Magne Lund-Hansen4

  • 1Department of Physical Performance, The Norwegian School of Sport Sciences, Ullevål Stadion, Post Box 4014, 0806, Oslo, Norway. thomasl@nih.no.

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Summary

Rollerski testing shows high reliability for cross-country skiers, but familiarization is key. This study provides a framework for practitioners to track true performance changes in skiers using rollerski treadmills.

Keywords:
Cross-country skiingNordic skiingOxygen uptakePerformanceTraining

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Area of Science:

  • Sports Science
  • Exercise Physiology
  • Biomechanical Analysis

Background:

  • Cross-country skiing performance relies on efficient technique and physiological capacity.
  • Accurate and reliable testing methods are crucial for monitoring athlete progress and training adaptations.
  • Rollerski treadmills offer a controlled environment for assessing ski-specific fitness.

Purpose of the Study:

  • To determine the test-retest reliability of rollerski testing in competitive cross-country skiers.
  • To assess the impact of familiarization trials on test results.
  • To establish a reliable framework for practitioners evaluating changes in skiers' performance.

Main Methods:

  • Ten competitive cross-country skiers underwent familiarization and three test trials within 14 days.
  • Testing included sub-maximal efforts (10-16 km/h) and a maximal test until failure (MTF).
  • Reliability was measured using coefficient of variation (CV%) and intraclass correlation (ICC).

Main Results:

  • Speed at MTF showed high reliability (CV 1.5%, ICC 0.96) but a familiarization bias.
  • Peak oxygen uptake (VO2) demonstrated good reliability (CV 2.2%, ICC 0.93) with no systematic bias.
  • VO2 at submaximal loads was reliable (CV 2.1%, ICC 0.94) without systematic changes.

Conclusions:

  • Rollerski testing exhibits strong test-retest reliability for most physiological measures.
  • Familiarization trials are essential for accurate assessment of maximal speed.
  • The findings provide a reliable framework for practitioners to interpret performance changes in skiers.