Universidade Federal de São Carlos, Neuropediatrics Section, Physical Therapy Department, São Carlos, SP, Brazil.
Braz J Phys Ther. 2013 Mar-Apr;17(2):112-20. doi: 10.1590/S1413-35552012005000074.
The isokinetic dynamometer has been considered the gold-standard measurement of muscle performance. However, the reliability for the passive mode in children has not been reported to date.
The purpose was to evaluate the reliability of the isokinetic dynamometer in passive mode in children.
Twenty-one healthy children (ten girls, eleven boys), aged 5 to 12 years (age: 8.5±2.2 years), were evaluated using an isokinetic dynamometer. Each participant was tested twice with a one-week interval and performed five consecutive cycles of knee extension and flexion. The test was performed at 60º/s in the concentric passive mode and the children performed maximal contractions. The measured variables were peak torque, average peak torque, total work, and average power, time to peak torque and angle of peak torque for dominant and non-dominant lower limbs. Reliabilities were determined using intraclass correlation coefficient (ICC3,1), standard error of measurement (SEM and SEM%), and coefficient of variation (CV).
We found good reliability in both lower limbs for peak torque, average peak torque, total work and average power of knee flexors and extensors, with ICC3,1 values greater than 0.80; SEM ranging from 6.7 to 79.2; SEM% ranging from 10.4% to 16.8%; CV lower than 15%. Bland-Altman analysis showed that the bias was low than 10% and limits of agreement (LOAs) ranging from 33.9% to 59.2%, and -28.8% and -52.8%, showing that measures tended to disagree. However, time to peak torque (ICC3,1<0.68; SEM > 0.34; SEM%>37.4%; CV>41.7%; bias >24.0%; LOA>101.0%) and angle of peak torque (ICC3,1<0.76; SEM>9.3; SEM%>27.6%; CV>15.3%; bias>11.0%; LOA>61.0%) were not reliable.
The findings indicate that isokinetic evaluation in passive mode for knee extensors and flexors of dominant and non-dominant lower limbs of children without disabilities was reliable for peak torque, average peak torque, work, and power. However, average time to peak torque and angle of peak torque were not reliable.
等速测力仪已被视为肌肉性能的金标准测量方法。然而，目前尚未有关于儿童被动模式的可靠性的报道。
评估儿童等速测力仪在被动模式下的可靠性。
21 名健康儿童（10 名女孩，11 名男孩），年龄 5 至 12 岁（年龄：8.5±2.2 岁），使用等速测力仪进行评估。每位参与者在一周的间隔内进行两次测试，进行五次连续的膝关节屈伸运动。测试以 60°/s 的速度在向心被动模式下进行，儿童进行最大收缩。测量的变量为峰值扭矩、平均峰值扭矩、总功和平均功率、达到峰值扭矩的时间和主导和非主导下肢的峰值扭矩角度。使用组内相关系数（ICC3,1）、测量误差（SEM 和 SEM%）和变异系数（CV）来确定可靠性。
我们发现，对于主导和非主导下肢的膝关节屈伸肌的峰值扭矩、平均峰值扭矩、总功和平均功率，均具有良好的可靠性，ICC3,1 值大于 0.80；SEM 范围为 6.7 至 79.2；SEM%范围为 10.4%至 16.8%；CV 低于 15%。Bland-Altman 分析表明，偏差低于 10%，一致性界限（LOA）范围为 33.9%至 59.2%，-28.8%至-52.8%，表明测量值存在差异。然而，达到峰值扭矩的时间（ICC3,1<0.68；SEM>0.34；SEM%>37.4%；CV>41.7%；偏差>24.0%；LOA>101.0%）和峰值扭矩角度（ICC3,1<0.76；SEM>9.3；SEM%>27.6%；CV>15.3%；偏差>11.0%；LOA>61.0%）不可靠。
研究结果表明，对于无残疾的儿童主导和非主导下肢的膝关节伸肌和屈肌，等速评估的被动模式在峰值扭矩、平均峰值扭矩、功和功率方面具有可靠性。然而，平均达到峰值扭矩的时间和峰值扭矩角度不可靠。
