非运动员人群膝关节等速力量的替代预测方程

关键词：预测方程  肌肉无力  等速运动  峰值矩  膝关节力量

Keywords:prediction equations  muscle weakness  isokinetic movement  peak torque  knee strength

摘要：

      摘要 目的：开发可根据常用人体测量学特征预测非运动员人群膝关节等速肌力的替代预测方程。 方法：302例（160例女性，142例男性）年龄10—79岁的健康非运动员志愿者接受了角速度为60°/s的膝关节等速肌力测试。随机选择40例进行重新测试，以评估等速设备的可靠性。采用逐步回归来分析膝关节力量与年龄、性别、身高与体重等变量之间的关系，建立峰力矩（peak torque，PT）的多重线性回归方程。70例受试者（32.11±10.86岁）被单独用于预测方程的验证。将建立的预测方程与Gross等已建立的方程进行比较，并构建Bland-Altman图评估方程预测值与实际测量值的一致性。 结果：所用仪器具有良好的可靠性（ICC>0.90，P<0.001）。膝关节伸肌和屈肌的PT值与年龄、性别、身高、体重之间存在显著关系（伸膝PT：Adjusted R2=0.775，P<0.001；屈膝PT：Adjusted R2=0.684，P<0.001）。此外，我们建立的方程具备更高的预测准确性，而Gross等的方程显著低估了预测的伸膝PT值，高估了屈膝PT值。 结论：本研究为非运动员群体的膝关节等速力量提供了更准确的预测方程。

Abstract:

      Abstract Objective： To develop alternative prediction equations that could predict knee isokinetic strength based on anthropometric characteristics for the non-athlete populations. Method： Three hundred and two healthy nonathletic （160 females， 142 males） between the ages of 10 and 79 years underwent knee isokinetic testing at 60°/s. A subset of 40 subjects was randomly selected for retesting to assess the reliability of the isokinetic instrument. Stepwise regression was used to analyze the relationship between knee strength and variables such as age， gender， height， and weight, establishing multiple linear regression equations for peak torque （PT）. A separate group of 70 subjects （average age 32.11±10.86 years） were used to validate predictive equations. The established predictive equations were compared with those established by Gross et al.，and Bland-Altman plots were constructed to assess the consistency between the predicted values of the equations and the actual measurements. Result： The instrument used demonstrated excellent reliability （ICC＞0.90，P<0.001）. There were significant relationships between the PT values for the knee extensor and flexor muscles and age， gender， height， and weight （Extension PT： Adjusted R2=0.775， P<0.001； Flexion PT： Adjusted R2=0.684， P<0.001）. Furthermore， the equations had higher predictive accuracy， whereas Gross et al.'s equations significantly underestimated the predicted extensor PT values and overestimated the flexor PT values. Conclusion： This study provided more accurate prediction equations for knee isokinetic strength in a non-athlete population.