Department of Rehabilitation, Skåne University Hospital, Orupssjukhuset, Lund, Sweden.
J Rehabil Med. 2010 Jun;42(6):588-92. doi: 10.2340/16501977-0561.
To assess the reliability of knee extensor and flexor muscle strength measurements in persons with late effects of polio.
A test-retest reliability study.
Thirty men and women (mean age 63 (standard deviation 6.4) years) with verified late effects of polio.
Knee extensor and flexor muscle strength in both lower limbs were measured twice 7 days apart using a Biodex dynamometer (isokinetic concentric contractions at 60 degrees /sec and isometric contractions with knee flexion angle 90 degrees) and a Leg Extension/Curl Rehab exercise machine with pneumatic resistance (HUR) (isotonic contractions). Reliability was assessed with the intraclass correlation coefficient (ICC1,1), the mean difference between the test sessions (d) together with the 95% confidence intervals for d, the standard error of measurement (SEM and SEM%), the smallest real difference (SRD and SRD%) and Bland-Altman graphs.
Test-retest agreements were high, (ICC1,1 0.93-0.99) and measurement errors generally small. The SEM% was 4-14% and the SRD% 11-39%, with the highest values for the isokinetic measurements.
Knee muscle strength can be measured reliably and can be used to detect real changes after an intervention for a group of persons with late effects of polio, whereas the values may be too high for single individuals or to detect smaller short-term changes over time for a group of individuals.
评估患有小儿麻痹后遗症人群的膝关节伸肌和屈肌肌力测量的可靠性。
测试-再测试可靠性研究。
30 名男性和女性（平均年龄 63（标准差 6.4）岁），患有小儿麻痹后遗症。
使用 Biodex 测力计（60 度/秒的等速向心收缩和 90 度膝关节屈曲角度的等长收缩）和带有气动阻力的 Leg Extension/Curl Rehab 运动机（HUR）（等张收缩）两次测量双侧膝关节伸肌和屈肌肌力，两次测量间隔 7 天。可靠性评估采用组内相关系数（ICC1,1）、测试期间的平均差异（d）及其 d 的 95%置信区间、测量误差（SEM 和 SEM%）、最小真实差异（SRD 和 SRD%）和 Bland-Altman 图。
测试-再测试的一致性很高（ICC1,1 0.93-0.99），测量误差通常较小。SEM%为 4-14%，SRD%为 11-39%，等速测量的数值最高。
可以可靠地测量膝关节肌肉力量，并用于检测小儿麻痹后遗症人群干预后的真实变化，而对于个体或群体随时间的短期变化，其数值可能过高。
