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A wide number of trials is required to achieve acceptable reliability for measurement patellar tendon elongation in vivo

机译：为了在体内测量pa骨肌腱伸长率达到可接受的可靠性，需要进行大量试验

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The purpose of the current study was to examine the reproducibility of patellar tendon elongation measurements using brightness-mode ultrasonography (BMU) during isometric knee extension contractions. We hypothesized that the measurement of the patellar tendon elongation during only one maximal voluntary isometric knee extension contractions would not provide reliable results and that a wide number of trials is required to achieve acceptable reliability. Ten participants (eight male and two female) performed 10 isometric knee extension contractions on two separate days (5 trials on each day). Using a modified knee brace, the ultrasound probe was firmly adjusted in the sagittal plane overlying the patellar tendon. The registered ultrasound images were analyzed by three different but equally trained observers. The reproducibility was examined by the calculation of the within-day, between-day and overall coefficient of multiple correlations (wCMC, bCMC and oCMC). The Spearman-Brown prophecy formula was use to estimate the required trials to achieve the desired reliability. The wCMC, bCMC and oCMC were in average 0.824, 0.798 and 0.770, respectively, suggesting a rather moderate reproducibility of patellar tendon elongation measurements. For a high reliability (≥0.95) of tendon elongation measurements 5-6 trials are required. Finally, the results revealed an independence of the measurements from days and observers.
机译：本研究的目的是检查在等距膝盖伸展收缩过程中使用亮度模式超声检查（BMU）进行tell骨腱伸长测量的可重复性。我们假设仅在一次最大的自愿等距膝盖伸展收缩过程中the骨肌腱伸长的测量将无法提供可靠的结果，并且需要进行大量试验才能获得可接受的可靠性。十名参与者（八名男性和两名女性）分别在两天中进行了十次等距膝盖伸展收缩（每天进行5次试验）。使用改良的护膝，在probe骨腱上的矢状平面内牢固地调整超声探头。由三个不同但受过同等训练的观察者分析了注册的超声图像。通过计算日内，日间和多个相关系数（wCMC，bCMC和oCMC）的整体系数来检查可重复性。 Spearman-Brown预言公式用于估计所需的试验，以实现所需的可靠性。 wCMC，bCMC和oCMC的平均值分别为0.824、0.798和0.770，这表明tell肌腱伸长率测量值的再现性中等。为了高度可靠（≥0.95）进行肌腱伸长测量，需要进行5-6次试验。最后，结果表明测量值不受天数和观察者的影响。

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