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Purpose <p>We examined the test–retest reliability of rollerski testing across a familiarization trial followed by three separate test trials (T1–T3) conducted within a 14-day period.</p> Methods <p>Ten competitive cross-country skiers performed three sub-maximal tests (5%, speed range 10–16&#xa0;km h<sup>−1</sup>) and a maximal speed test until failure (MTF; ~ 5–8&#xa0;min, 7%, &gt; 10&#xa0;km h<sup>−1</sup>) on a rollerski treadmill using the Gear 3 ski skating sub-technique. Reliability was assessed as within-subject typical error, expressed as a coefficient of variation (CV%, [confidence limits]) intraclass correlation (ICC, [confidence limits]), and changes in mean (%).</p> Results <p>The speed at MTF demonstrated a mean CV (T1–T3) of 1.5% [1.1, 2.6] and an ICC of 0.96 [0.87, 0.99], but a systematic familiarization bias from T1 to T2 (1.2% [0.1, 2.3]) and T2 to T3 (2.2% [0.1, 4.3]). Peak oxygen uptake exhibited a mean CV of 2.2% [1.6, 3.8] and an ICC of 0.93 [0.78, 0.98], with no systematic changes from T1 to T2 (−&#xa0;0.2% [−&#xa0;2.0, 1.6]) and T2 to T3 (1.8% [−&#xa0;1.1, 4.7]). VO<sub>2</sub> at submaximal load showed a mean CV of 2.1% [1.5, 3.3] and an ICC of 0.94 [0.84,0.99], with no systematic changes from T1 to T2 (−&#xa0;0.7% [−&#xa0;2.4, 1.1]) and T2 to T3 (−&#xa0;0.1% [−&#xa0;2.4, 2.3]).</p> Conclusion <p>The relatively low CV and high ICC for most measures suggest a high degree of test–retest reliability. However, the systematic mean changes in MTF indicate that familiarization trials are essential to provide valuable information about individual changes. Overall, these reliability measures can be used as a framework by practitioners to discern true changes when testing on a rollerski treadmill.</p>

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Test–retest reliability of performance variables during treadmill rollerski skating

  • 期刊论文

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  • 发表日期：

    2025年3月27日

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  • Thomas Losnegard,
  • Paul André Solberg,
  • Magne Lund-Hansen,
  • Martin Skaugen,
  • Joar Hansen,
  • Knut Skovereng,
  • Øyvind Sandbakk

摘要

Purpose

We examined the test–retest reliability of rollerski testing across a familiarization trial followed by three separate test trials (T1–T3) conducted within a 14-day period.

Methods

Ten competitive cross-country skiers performed three sub-maximal tests (5%, speed range 10–16 km h−1) and a maximal speed test until failure (MTF; ~ 5–8 min, 7%, > 10 km h−1) on a rollerski treadmill using the Gear 3 ski skating sub-technique. Reliability was assessed as within-subject typical error, expressed as a coefficient of variation (CV%, [confidence limits]) intraclass correlation (ICC, [confidence limits]), and changes in mean (%).

Results

The speed at MTF demonstrated a mean CV (T1–T3) of 1.5% [1.1, 2.6] and an ICC of 0.96 [0.87, 0.99], but a systematic familiarization bias from T1 to T2 (1.2% [0.1, 2.3]) and T2 to T3 (2.2% [0.1, 4.3]). Peak oxygen uptake exhibited a mean CV of 2.2% [1.6, 3.8] and an ICC of 0.93 [0.78, 0.98], with no systematic changes from T1 to T2 (− 0.2% [− 2.0, 1.6]) and T2 to T3 (1.8% [− 1.1, 4.7]). VO2 at submaximal load showed a mean CV of 2.1% [1.5, 3.3] and an ICC of 0.94 [0.84,0.99], with no systematic changes from T1 to T2 (− 0.7% [− 2.4, 1.1]) and T2 to T3 (− 0.1% [− 2.4, 2.3]).

Conclusion

The relatively low CV and high ICC for most measures suggest a high degree of test–retest reliability. However, the systematic mean changes in MTF indicate that familiarization trials are essential to provide valuable information about individual changes. Overall, these reliability measures can be used as a framework by practitioners to discern true changes when testing on a rollerski treadmill.