This study examined the factorial structure of trunk motor qualities and their associations with explosive muscular performance of football players. Ninety-one young male football players (age: 15–21 years; body height: 1.78 ± 0.07 m; body mass: 70.3 ± 7.5 kg) performed a series of tests: four standing and four seated isometric trunk strength tests, seven trunk power (medicine ball throwing) tests, four trunk endurance tests and four explosive movement performance tests. A principal component factor analysis (PCA) was used to determine the structure of trunk motor qualities, and correlational analyses were used to assess linear associations between trunk motor qualities and explosive performance. The PCA revealed four independent factors—trunk power, standing and seated isometric trunk strength, and trunk muscle endurance. Only trunk power had significant moderate, logically positive associations with sprint and vertical jump performance (common variance: 25–36%), while other associations between trunk motor factors and explosive movement performance were generally low to very low. These results indicate that trunk muscle functions of football players can be described with three independent motor qualities—trunk power, trunk strength and trunk muscle endurance, with only trunk power being moderately associated with players’ sprinting and jumping performance.

中文翻译：

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青少年足球运动员躯干运动素质的因子结构及其与爆发力表现的关系

这项研究检查了躯干运动素质的析因结构及其与足球运动员爆发性肌肉表现的关系。九十一名年轻的男足球运动员（年龄：15-21岁；身高：1.78±0.07 m；体重：70.3±7.5 kg）进行了一系列测试：四次站立和四坐等距躯干力量测试，七次躯干力量（药丸投掷）测试，四个躯干耐力测试和四个爆炸运动性能测试。主成分因子分析（PCA）用于确定躯干马达质量的结构，相关分析用于评估躯干马达质量与炸药性能之间的线性关联。PCA显示了四个独立的因素-躯干力量，站立和坐着的等长躯干力量以及躯干肌肉的耐力。只有躯干力量与短跑和垂直跳跃性能具有显着的中度，逻辑正相关性（共同方差：25–36％），而躯干运动因素与爆炸运动性能之间的其他关联性通常较低或非常低。这些结果表明，足球运动员的躯干肌肉功能可以用三种独立的运动品质来描述：躯干力量，躯干力量和躯干肌肉耐力，只有躯干力量与运动员的短跑和跳跃表现适度相关。