Dedering A, Németh G, Harms-Ringdahl K
Department of Orthopedics, Karolinska Hospital, Stockholm, Sweden.
Clin Biomech (Bristol). 1999 Feb;14(2):103-11. doi: 10.1016/s0268-0033(98)00053-9.
The purpose of this study was to correlate objective measurements of muscle fatigue in the lower back to the subject's own assessment of fatigue.
Muscle fatigue in the lower back was assessed in healthy subjects using electromyography (EMG), endurance time and the Borg scale.
Muscle fatigue, measured with EMG and endurance time, in the lower back, is significant for patients with pain in the lower back.
Fifty healthy subjects participated. EMG was detected from the lumbar extensor muscles during a modified Sørensen's test, an isometric contraction for the back extensors until exhaustion. During the test, subjects rated their subjective fatigue on a Borg CR-10 scale.
Borg scale ratings correlated with endurance time (0.68) and EMG median- and mean power frequency slopes (0.41-0.50). At a Borg rating of 3, median- and mean power frequency and endurance time were reduced by 30%. At a Borg rating of 5, median- and mean power frequency and endurance time were reduced by 50%. At a Borg rating of 7, median- and mean power frequency and endurance time were reduced by 60-70%.
Significant correlation between the Borg scale, EMG and endurance time suggests a close relationship between subjective and objective assessment of muscle fatigue.
本研究旨在将下背部肌肉疲劳的客观测量结果与受试者自身的疲劳评估相关联。
使用肌电图（EMG）、耐力时间和博格量表对健康受试者的下背部肌肉疲劳进行评估。
对于下背部疼痛的患者，通过EMG和耐力时间测量的下背部肌肉疲劳具有重要意义。
五十名健康受试者参与研究。在改良的索伦森试验（一种背部伸肌等长收缩直至疲劳）过程中，从腰椎伸肌检测EMG。在测试过程中，受试者根据博格CR-10量表对其主观疲劳程度进行评分。
博格量表评分与耐力时间（0.68）以及EMG中位功率频率和平均功率频率斜率（0.41 - 0.50）相关。在博格评分为3时，中位功率频率、平均功率频率和耐力时间降低了30%。在博格评分为5时，中位功率频率、平均功率频率和耐力时间降低了50%。在博格评分为7时，中位功率频率、平均功率频率和耐力时间降低了60 - 70%。
博格量表、EMG和耐力时间之间的显著相关性表明，肌肉疲劳的主观评估和客观评估之间存在密切关系。
