Introduction: Isometric and isokinetic dynamometers are mainly used for assessment of strength and endurance of core muscles. However, muscle power represents a more appropriate variable for evaluating of athlete performance that involve dynamic movements of the trunk. This study estimates test-retest reliability of trunk rotational power and velocity over a 1-week interval using the FiTRO Torso Isoinertial Dynamometer. Material and Methods: A group of 32 physically active men performed 5 trunk rotations to each side while seated with a barbell of 1 kg or 20 kg placed on their shoulders. Results: Results showed that assessment of peak and mean velocity in the acceleration phase of trunk rotations with 1 kg provides reliable results (ICC = 0.94 and 0.92 respectively, SEM = 7.0% and 7.3% respectively). However, peak and mean values of velocity and power obtained during trunk rotations with a weight of 20 kg should be interpreted with caution (ICC < 0.80, SEM > 10%). Conclusions: Such an assessment of trunk rotational power and velocity can be used in practice, however with a limitation of performing trunk rotations in a seated position and using lower loads.

中文翻译：

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评估坐着的躯干旋转过程中肌肉力量和速度的新方法的可靠性

简介：等轴测功机和等速测力计主要用于评估核心肌肉的力量和耐力。但是，肌肉力量代表一个更合适的变量，用于评估涉及躯干动态运动的运动员表现。这项研究使用FiTRO躯干等功测力计估计了1周间隔内躯干旋转功率和速度的重测可靠性。材料和方法：一组32名体育锻炼的男性坐在肩膀上的1公斤或20公斤杠铃坐着的同时，向两侧进行5次躯干旋转。结果：结果表明，评估1 kg躯干旋转加速阶段的峰值速度和平均速度可提供可靠的结果（ICC分别为0.94和0.92，SEM分别为7.0％和7.3％）。然而，在谨慎地解释重量为20 kg的躯干旋转期间获得的速度和功率的峰值和平均值（ICC <0.80，SEM> 10％）。结论：这样的躯干旋转功率和速度评估可以在实践中使用，但是局限性在于在坐着的位置进行躯干旋转并使用较低的负荷。