膝骨关节炎患者肌电标准化方法的信度研究

目的 评估标准等长收缩(standard isometric contraction, SIC)与最大随意等长收缩(maximum voluntary isometric contraction, MVIC)应用于膝骨关节炎(knee osteoarthritis, KOA)患者肌电标准化的重测信度。方法 采用无线肌电测试系统收集KOA患者患侧腿在慢跑、SIC测试和MVIC测试时臀大肌、半腱肌、股直肌、股外侧肌、胫骨前肌、外侧腓肠肌和比目鱼肌的肌电数据。使用组内相关系数和95%置信区间评估重测信度。结果 KOA患者执行SIC测试时7块肌肉的重测信度均较好，执行MVIC测试时5块肌肉重测信度一般，2块肌肉重测信度较好，7块肌肉在SIC测试中的重测信度均高于MVIC测试；KOA患者慢跑时7块肌肉经SIC标准化后的重测信度均高于经MVIC标准化的重测信度，且股直肌经SIC标准化后的重测信度显著高于经MVIC标准化的重测信度。结论 对于KOA患者，SIC是一种比MVIC更为可靠的表面肌电标准化方案，具有较好的临床推广潜力。

Reliability Study of Electromyography Normalization in Patients with Knee Osteoarthritis

Objective To evaluate the test-retest reliability of electromyography (EMG) normalization in patients with knee osteoarthritis by the standard isometric contraction (SIC) and maximum voluntary isometric contraction (MVIC ) tests. Methods For patients with knee osteoarthritis, the EMG data in gluteus maximus, semitendinosus, rectus femoris, lateralis femoris, tibialis anterior, lateral gastrocnemius and soleus of their affected legs during jogging, SIC tests and MVIC tests were collected using the wireless EMG system. Intra-class correlation coefficients (ICC) with 95% confidence intervals were used to assess the test-retest reliability. Results For patients with knee osteoarthritis, the test-retest reliability of all 7 muscles was good during SIC tests, but the test-retest reliability was high for 2 muscles and moderate for 5 muscles during MVIC tests. The test-retest reliability of all 7 muscles normalized by SIC was higher than that normalized by MVIC, and the test-retest reliability of rectus femoris normalized by SIC was significantly higher than that normalized by MVIC. Conclusions For patients with knee osteoarthritis, SIC is a more reliable EMG normalization method than MVIC, and it has good promotion potential in clinic.