Canadian Centre for Activity and Aging, School of Kinesiology, Faculty of Health Sciences, The University of Western Ontario, London, ON N6A 5B9, Canada.
Appl Physiol Nutr Metab. 2011 Oct;36(5):626-33. doi: 10.1139/h11-068. Epub 2011 Oct 7.
The determination of power using isokinetic testing has been shown to be highly reliable. However, isotonic and isokinetic testing involve specific mechanical constraints that likely necessitate different neuromuscular strategies. Therefore, the purpose here was to establish test-retest intrarater reliability (separated by 7 days) of loaded maximal shortening velocity and velocity-dependent power of the ankle dorsiflexors using the isotonic mode of the Biodex dynamometer (i) at baseline and (ii) throughout recovery following 150 high-intensity lengthening contractions. Intraclass correlation coefficients (ICC)(2,1) with 95% CIs were used to determine relative reliability, whereas absolute reliability included typical error (TEM) and typical error expressed as a coefficient of variation (TEM(CV)). Twenty-four young men and women volunteered for the study. Maximal shortening velocity and power were determined with a fixed resistance set at 20% of maximal voluntary isometric contraction across 2 testing sessions separated by 7 days. ICCs were 0.93 and 0.98 for maximal shortening velocity and peak power, respectively. Following the lengthening contractions, ICCs indicated high reliability for maximal shortening velocity and peak power, 0.86 and 0.94, respectively, suggesting that a similar amount of fatigue was incurred on both days. Measures of absolute reliability for maximal shortening velocity and peak power also yielded high reliability. The isotonic mode is highly reliable when testing velocity-dependent power of the ankle dorsiflexors at baseline and following fatiguing lengthening contractions. The high reliability of this measure is encouraging and suggests that the isotonic mode can be used in various settings to track group changes before and after training and following fatigue and lengthening contractions.
使用等速测试来确定功率已被证明具有高度可靠性。然而，等张和等速测试涉及特定的机械限制，这可能需要不同的神经肌肉策略。因此，本研究的目的是确定使用 Biodex 测力计的等张模式在基线时（i）和在 150 次高强度伸展收缩后恢复期间（ii）测定踝关节背屈肌的加载最大缩短速度和速度依赖性功率的测试-重测内部测试者可靠性。使用 95%置信区间的组内相关系数（ICC）（2,1）来确定相对可靠性，而绝对可靠性包括典型误差（TEM）和以变异系数表示的典型误差（TEM（CV））。24 名年轻男女自愿参加了这项研究。在两次测试之间间隔 7 天的情况下，使用固定阻力设置为最大自主等长收缩的 20%来确定最大缩短速度和功率。最大缩短速度和最大功率的 ICC 分别为 0.93 和 0.98。在伸展收缩后，最大缩短速度和最大功率的 ICC 表明具有高度可靠性，分别为 0.86 和 0.94，这表明两天内发生了相似程度的疲劳。最大缩短速度和最大功率的绝对可靠性测量也产生了高度可靠性。在基线和疲劳伸展收缩后，等张模式测试踝关节背屈肌的速度依赖性功率时具有高度可靠性。该测量的高可靠性令人鼓舞，表明等张模式可用于各种环境中，在训练前后以及疲劳和伸展收缩后跟踪群体变化。
