Appropriate performance tests are critical for documenting training, fatigue and injury-related changes. Functional performance testing can provide quantitative information on specialized sport movements. The single-leg, medial countermovement jump is an objective measure of frontal plane force, velocity and power, and is particularly applicable for ice hockey players given that ice skating involves applying lateral forces. This study assessed the short-term reliability (10 days) of the single-leg, medial countermovement jump performed by ten competitive male youth ice hockey players. Each participant performed three right and three left maximal single-leg, medial countermovement jumps from force plates. Measured variables included lateral and vertical takeoff velocity, lateral and vertical maximal force, maximal force above bodyweight, lateral and vertical peak concentric power, average concentric power, and average concentric power during the last 100 ms of push-off. Relative reliability was quantified by intraclass correlations. Absolute reliability and the smallest real difference were also calculated. The single-leg, medial countermovement jump had moderate-to-excellent test–retest reliability (ICC: 0.50–0.98) for all twelve variables of interest. These results suggest that the single-leg, medial countermovement jump is a reliable test for assessing frontal plane force, velocity and power in ice hockey players, and is a valid functional performance test for this population given the similarity to ice skating.

中文翻译：

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青少年冰球运动员单腿内侧反跳动作的可靠性

适当的性能测试对于记录培训，疲劳和与伤害相关的变化至关重要。功能性能测试可以提供有关专业运动的定量信息。单腿内侧反跳是客观测量前平面力，速度和力量的方法，特别适用于冰球运动员，因为滑冰涉及施加外力。这项研究评估了十名竞技青年冰上曲棍球运动员进行的单腿内侧反跳动作的短期可靠性（10天）。每个参与者进行了三个右腿和三个左腿的最大单腿内侧反跳动作。测得的变量包括横向和垂直起飞速度，横向和垂直最大力，体重以上的最大力，在下推的最后100毫秒内，横向和垂直峰值同心功率，平均同心功率和平均同心功率。相对可靠性通过组内相关性进行量化。还计算了绝对可靠性和最小的实际差异。对于所有感兴趣的十二个变量，单腿内侧反跳均具有中等至出色的重测信度（ICC：0.50-0.98）。这些结果表明，单腿内侧反跳是评估冰球运动员前额平面力，速度和力量的可靠测试，并且鉴于与溜冰的相似性，因此是针对该人群的有效功能性能测试。相对可靠性通过组内相关性进行量化。还计算了绝对可靠性和最小的实际差异。对于所有感兴趣的十二个变量，单腿内侧反跳均具有中等至出色的重测信度（ICC：0.50-0.98）。这些结果表明，单腿内侧反跳是评估冰球运动员前额平面力，速度和力量的可靠测试，并且鉴于与溜冰的相似性，因此是针对该人群的有效功能性能测试。相对可靠性通过组内相关性进行量化。还计算了绝对可靠性和最小的实际差异。对于所有感兴趣的十二个变量，单腿内侧反跳均具有中等至出色的重测信度（ICC：0.50-0.98）。这些结果表明，单腿内侧反跳是评估冰球运动员前额平面力，速度和力量的可靠测试，并且鉴于与溜冰的相似性，因此是针对该人群的有效功能性能测试。