School of Biomedical Sciences, The University of Queensland, St. Lucia, Brisbane, 4072, Australia.
School of Allied Health Sciences and Menzies Health Institute Queensland, Griffith University, Gold Coast, 4222, Australia.
Eur J Appl Physiol. 2019 Mar;119(3):761-770. doi: 10.1007/s00421-018-04067-5. Epub 2019 Jan 8.
This study investigated whether laser displacement mechanomyography (MMG) could detect acute injury of low back muscles following strenuous eccentric exercise.
Sixteen healthy adults (10 females, 6 males, mean ± standard deviation, age 21 ± 2.90 years, BMI 21.63 ± 1.99 kg/m), without low back pain or low back resistance training, were recruited. Strength [maximum voluntary isometric contraction force (MVC)], pain intensity [visual analogue scale (VAS)], biological markers of muscle injury (serum myoglobin and creatine kinase levels), and MMG-derived muscle contractile properties were measured at seven different time points. Pre-exercise 'control' measures were taken prior to a strenuous eccentric exercise task, followed by an immediate post-exercise measurement and further four consecutive daily measurements. A final post-exercise measurement was completed on day 12 post-exercise.
Compared to pre-exercise control, MVC was lower immediately post-exercise (day 1) and on days 2-3. VAS scores were higher post-exercise (day 1) and from days 2-5. Myoglobin was significantly higher on day 4, whilst creatine kinase was significantly higher on days 4-5. MMG-derived maximum muscle displacement (D) was significantly diminished post-exercise (day 1) at all vertebral segments (L1-MT), while contraction velocity (V) was significantly slower at all segments except sacral multifidus. V recovered rapidly (by day 2), while mid-lumbar D resolved on day 12. D had moderate correlations with MVC (R = 0.61) and VAS (R = - 0.50), and low correlations with myoglobin (R = - 0.36).
MMG appears capable of detecting changes in muscle contractile properties associated with an acute bout of low back pain.
本研究旨在探讨激光位移肌动描记术（MMG）是否可检测剧烈离心运动后腰部肌肉的急性损伤。
招募了 16 名健康成年人（10 名女性，6 名男性，平均年龄 21±2.90 岁，BMI 21.63±1.99kg/m²），他们无腰痛或腰部抗阻训练史。在 7 个不同时间点测量力量[最大自主等长收缩力（MVC）]、疼痛强度[视觉模拟评分（VAS）]、肌肉损伤的生物标志物（血清肌红蛋白和肌酸激酶水平）和 MMG 衍生的肌肉收缩特性。在剧烈离心运动任务前进行运动前“对照”测量，随后进行即刻运动后测量，并进行连续 4 天的测量，最后在运动后第 12 天进行运动后测量。
与运动前对照相比，MVC 在运动后即刻（第 1 天）和第 2-3 天降低。VAS 评分在运动后（第 1 天）和第 2-5 天升高。肌红蛋白在第 4 天显著升高，而肌酸激酶在第 4-5 天显著升高。MMG 衍生的最大肌肉位移（D）在所有椎骨节段（L1-MT）在运动后即刻（第 1 天）显著降低，而收缩速度（V）除骶骨多裂肌外，在所有节段均显著降低。V 在第 2 天迅速恢复，而中腰部 D 在第 12 天得到解决。D 与 MVC（R=0.61）和 VAS（R=-0.50）具有中度相关性，与肌红蛋白（R=-0.36）具有低度相关性。
MMG 似乎能够检测与急性腰痛发作相关的肌肉收缩特性变化。
