Muscle strength training is an important part of rehabilitation. Scientific and reasonable strength training exercise prescription usually needs to be set based on the percentage of 1-repetition maximum (1RM). However, accurate 1RM is difficult to obtain in practice, so patients often lack appropriate resistance training prescription, which reduces the efficiency of muscle strength training and delays the recovery of overall function.

To explore the predictive ability of isokinetic muscle strength test for 1RM of knee extension and establish the 1RM prediction equation based on isokinetic muscle strength test results.

From March to June 2024, 61 healthy volunteers were recruited as the test group through the network platform and propaganda posters. Isokinetic muscle strength test and 1RM test of knee extension were carried out at an angular velocity of 60°/s, then peak torque (PT), peak force (PF) and 1RM were collected. Pearson correlation analysis was performed between PT, PF and 1RM, and univariate linear regression equations were established. Bland-Altman plot was constructed to evaluate the consistency between predicted value and the measured value of 1RM prediction equation.

Among the 61 subjects, 23 were male, with an average age of (25.6±6.0) years; there were 38 females with an average age of (24.5±5.3) years. The results of correlation analysis showed that the PT and PF value of male and female were positively correlated with 1RM (P<0.05). The 1RM prediction equation based on PF value was y=0.070x+1.836 for male, R²=0.514; y=0.087x+0.858 for female, R²=0.781; based on the 1RM prediction equation of PT value, y=0.177x+0.250 for male, R²=0.386; y=0.312x+0.464 for female, R²=0.766. The test results showed that the 95% LOA of 1RM prediction equation based on PT value was -8.37 to 14.81 kg for male and -4.47 to 9.33 kg for female. The 95% LOA of 1RM prediction equation based on PF value was -5.29 to 10.82 kg for male and -4.12 to 8.87 kg for female. The 1RM prediction equation based on PF value had better consistency.

The results showed that the PT value and PF value obtained on the isokinetic dynamometer can be used to predict the 1RM value of knee extension, and the predictive ability of PF value for 1RM is better than PT value.

肌肉力量训练是康复的重要组成部分，科学合理的力量训练运动处方通常需要基于等张1次重复最大值（1RM）的百分比进行设置。然而准确的1RM在实际中较难获得，患者常因缺乏合适的阻力训练处方而降低了肌力训练的效率并延缓整体功能的恢复。

探究等速肌力测试对膝关节伸展1RM的预测能力，并建立基于等速肌力测试结果的1RM预测方程。

于2024年3—6月通过网络平台及宣传海报招募61名健康志愿者作为受试组，采用60°/s角速度进行膝关节等速肌力测试和膝关节伸展1RM测试，采集峰力矩（PT）、峰值力（PF）及1RM。采用Pearson相关分析PT值、PF值与1RM的相关性，采用一元线性回归法建立1RM预测方程。采用Bland-Altman图评估1RM预测方程的预测值与实测值的一致性。

61名受试者中，男性23名，平均年龄（25.6±6.0）岁；女性38名，平均年龄（24.5±5.3）岁。相关性分析结果显示，男性和女性PT值、PF值与1RM均呈正相关（P<0.05）。基于PF值的1RM预测方程，男性为y=0.070x+1.836，R²=0.514；女性为y=0.087x+0.858，R²=0.781；基于PT值的1RM预测方程，男性为y=0.177x+0.250，R²=0.386；女性为y=0.312x+0.464，R²=0.766。Bland-Altman检验结果显示，基于PT值的1RM预测方程95%一致性界限（LOA）：男性为-8.37~14.81 kg，女性为-4.47~9.33 kg；基于PF值的1RM预测方程95% LOA：男性为-5.29~10.82 kg，女性为-4.12~8.87 kg。基于PF值的1RM预测方程具有更好的一致性。

在等速肌力测试设备上获得的PT值和PF值均可以用来预测膝关节伸展的1RM，其中PF值对1RM的预测能力优于PT值。