Losnegard Thomas, Solberg Paul André, Lund-Hansen Magne, Skaugen Martin, Hansen Joar, Skovereng Knut, Sandbakk Øyvind
Department of Physical Performance, The Norwegian School of Sport Sciences, Ullevål Stadion, Post Box 4014, 0806, Oslo, Norway.
Norwegian Olympic Federation, Oslo, Norway.
Eur J Appl Physiol. 2025 Mar 27. doi: 10.1007/s00421-025-05746-w.
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.
Ten competitive cross-country skiers performed three sub-maximal tests (5%, speed range 10-16 km h) and a maximal speed test until failure (MTF; ~ 5-8 min, 7%, > 10 km h) 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 (%).
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]). VO 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]).
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.
我们研究了在一次熟悉性试验后，于14天内进行三次独立测试试验（T1 - T3）的轮滑滑雪测试的重测信度。
10名竞技越野滑雪运动员使用Gear 3滑雪滑行子技术在轮滑滑雪跑步机上进行了三次次最大测试（5%，速度范围10 - 16千米/小时）和一次最大速度测试直至力竭（MTF；约5 - 8分钟，7%，>10千米/小时）。信度评估采用受试者内典型误差，以变异系数（CV%，[置信区间]）、组内相关系数（ICC，[置信区间]）以及平均值变化（%）表示。
MTF时的速度显示平均CV（T1 - T3）为1.5% [1.1, 2.6]，ICC为0.96 [0.87, 0.99]，但从T1到T2（1.2% [0.1, 2.3]）以及从T2到T3（2.2% [0.1, 4.3]）存在系统性的熟悉化偏差。峰值摄氧量的平均CV为2.2% [1.6, 3.8]，ICC为0.93 [0.78, 0.98]，从T1到T2（-0.2% [-2.0, 1.6]）以及从T2到T3（1.8% [-1.1, 4.7]）无系统性变化。次最大负荷时的VO显示平均CV为2.1% [1.5, 3.3]，ICC为0.94 [0.84, 0.99]，从T1到T2（-0.7% [-2.4, 1.1]）以及从T2到T3（-0.1% [-2.4, 2.3]）无系统性变化。
大多数测量指标相对较低的CV和较高的ICC表明重测信度较高。然而，MTF中的系统性平均变化表明熟悉性试验对于提供有关个体变化的有价值信息至关重要。总体而言，这些信度测量指标可被从业者用作一个框架，以便在轮滑滑雪跑步机上进行测试时辨别真实变化。
