Beijing Sport University, Graduate School, Beijing 100084, China.
J Electromyogr Kinesiol. 2011 Apr;21(2):356-62. doi: 10.1016/j.jelekin.2010.09.009. Epub 2010 Nov 13.
To investigate the feasibility of a non-invasive and instant method to evaluate the degree of exercise-induced muscle damage.
Thirteen male college athletes (23.4±1.0year, 180.03±3.51cm, 75.93±6.70kg) took part in the trial. Measures included serum creatine kinase (CK) after eccentric and endurance exercise, and surface electromyography (sEMG) during knee extension and flexion on a Biodex unit. Relation analysis was employed between sEMG and serum CK after the eccentric and endurance exercise.
There were positive correlations between serum CK at 24 and 48h after eccentric exercise and the AREA of sEMG for the slow isokinetic contraction before eccentric exercise (r=0.69, P<0.01 and 0.64, P<0.05, respectively). The zero crossing rate (ZCR) immediately after exercise was negatively correlated with serum CK at 48h after exercise for the slow and fast tests (r=-0.63 and -0.59, P<0.05, respectively). Mean power frequency (MPF) and ZCR of sEMG at 6h post endurance exercise were positively correlated with serum CK at 24h (r=0.73 and 0.69, P<0.05, respectively) for the fast isokinetic test.
Exercise-induced muscle damage as evaluated by serum CK was associated with the AREA of sEMG after eccentric exercise. The ZCR of sEMG was a good predictor of muscle damage after endurance exercise.
研究一种非侵入性和即时的方法来评估运动引起的肌肉损伤程度的可行性。
13 名男性大学生运动员（23.4±1.0 岁，180.03±3.51cm，75.93±6.70kg）参加了试验。测量指标包括离心和耐力运动后的血清肌酸激酶（CK），以及 Biodex 装置上膝关节伸展和弯曲时的表面肌电图（sEMG）。对离心和耐力运动后 sEMG 与血清 CK 之间进行了相关分析。
离心运动后 24 和 48 小时的血清 CK 与离心前慢等速收缩的 sEMG 的 AREA 呈正相关（r=0.69，P<0.01 和 0.64，P<0.05）。运动后即刻的零交叉率（ZCR）与慢和快测试中运动后 48 小时的血清 CK 呈负相关（r=-0.63 和-0.59，P<0.05）。耐力运动后 6 小时的 sEMG 的平均功率频率（MPF）和 ZCR 与快等速测试中运动后 24 小时的血清 CK 呈正相关（r=0.73 和 0.69，P<0.05）。
血清 CK 评估的运动引起的肌肉损伤与离心运动后 sEMG 的 AREA 有关。sEMG 的 ZCR 是耐力运动后肌肉损伤的良好预测指标。
