Norwegian Research Center for Active Rehabilitation, Oslo, Norway.
Arch Phys Med Rehabil. 2012 Mar;93(3):420-7. doi: 10.1016/j.apmr.2011.10.001. Epub 2012 Jan 23.
To evaluate inter- and intrarater reliability of isokinetic muscle strength measurements during knee extension and flexion in postmenopausal women with osteopenia.
Reliability study assessing inter- and intrarater reliability.
General community.
A convenience sample of 27 postmenopausal women (mean age ± SD, 68.2±7.3y) with defined osteopenia from a bone mineral density T score of less than 1.5 and a wrist fracture within the last 2 years.
Not applicable.
Isokinetic concentric muscle strength during knee extension and flexion was measured for 2 test conditions: 5 repetitions at 60°/s, and 25 repetitions at 180°/s. Agreement between tests was evaluated with the intraclass correlation coefficient (ICC(2,1)). Mean difference between tests, standard error of measurement (SEM and SEM%), and smallest real difference (SRD and SRD%) were calculated with 95% confidence intervals. SRD% and SEM% are emphasized in the results to allow congruent comparisons between the different test conditions.
ICC(2,1) reflected high agreement both for inter- and intrarater reliability, with most of the values .90 or greater. There were no significant differences between the left and the right leg at any of the 3 tests. Some differences were apparent between the test sessions, but these were not systematic. Agreements were overall higher for assessments during knee extension than knee flexion. The SEM% was between 3.5% and 10.2% for knee extension, and 7.0% and 17.7% for knee flexion. SRD% was suggested to be between 15% and 20% for knee extension, and 25% and 30% for knee flexion.
Isokinetic assessments of thigh muscle strength in postmenopausal women with osteopenia are of high reliability, with a level of agreement comparable to the levels found in previous reliability studies concerning both the healthy elderly and elderly with different health conditions. The measurement errors are small to moderate. The established SRD% provides thresholds for whether observed changes in strength in this patient group represent true change, which allows evaluations of minimal clinical importance in future studies.
评估绝经后骨质疏松症女性膝关节屈伸时等速肌肉力量测量的组内和组间可靠性。
评估组内和组间可靠性的可靠性研究。
普通社区。
从骨密度 T 评分小于 1.5 和过去 2 年内手腕骨折的绝经后骨质疏松症患者中，选择了 27 名方便样本的绝经后女性（平均年龄 ± 标准差，68.2±7.3 岁）。
不适用。
测量 2 种测试条件下膝关节屈伸的等速向心肌肉力量：60°/s 时重复 5 次，180°/s 时重复 25 次。使用组内相关系数（ICC(2,1)）评估测试之间的一致性。使用 95%置信区间计算测试之间的平均差异、测量标准误差（SEM 和 SEM%）和最小真实差异（SRD 和 SRD%）。结果强调了 SRD%和 SEM%，以允许在不同的测试条件之间进行一致的比较。
ICC(2,1)反映了组内和组间可靠性的高度一致性，大多数值大于或等于.90。在 3 项测试中，左腿和右腿之间没有显著差异。在一些测试中，测试之间存在差异，但这些差异不是系统性的。与膝关节屈曲相比，膝关节伸展时的评估结果总体上更高。SEM%在膝关节伸展时为 3.5%至 10.2%，在膝关节屈曲时为 7.0%至 17.7%。SRD%建议在膝关节伸展时为 15%至 20%，在膝关节屈曲时为 25%至 30%。
绝经后骨质疏松症女性大腿肌肉力量的等速评估具有很高的可靠性，其一致性水平与之前针对健康老年人和患有不同健康状况的老年人的可靠性研究中发现的水平相当。测量误差较小至中等。已建立的 SRD%为观察到的该患者群体的力量变化是否代表真实变化提供了阈值，这允许在未来的研究中评估最小的临床重要性。
