Department of Rehabilitation Medicine, Wakayama Medical University, Wakayama, Japan.
Department of Rehabilitation Medicine, Wakayama Medical University, 811-1 Kimiidera Wakayama City, Wakayama 641-8509, Japan.
PM R. 2018 Feb;10(2):175-182. doi: 10.1016/j.pmrj.2017.06.018. Epub 2017 Jun 30.
Lumbar spondylolysis is a defect in the pars interarticularis that is common in young athletes; the stress distribution at the pars interarticularis is the highest in extension and rotation movements. The paraspinal muscles play an important role in stabilization of the lumbar spine; however, no study has assessed the properties of paraspinal muscles in athletes with lumbar spondylolysis.
To evaluate the properties of paraspinal muscles in athletes with lumbar spondylolysis.
Cross-sectional study.
Laboratory.
Six high school baseball players with terminal-stage lumbar spondylolysis and 11 high school baseball players without organic lumbar lesions of similar anthropometric characteristics.
All subjects performed the unsupported trunk holding test combined with surface electromyographic (EMG) power spectral analysis until exhaustion. The results of EMG power spectral analysis were compared between the spondylolysis and control groups.
The median frequency (MF) was computed from the raw EMG signal of the erector spinae and multifidus during trunk holding test using fast Fourier transform spectrum analysis. The initial MF and MF slope were calculated.
No significant differences in endurance time were found between the spondylolysis and control groups. The initial MF and the MF slopes of the erector spinae and multifidus were significantly lower in the spondylolysis group than in the control group.
The results suggest lower fast-twitch motor unit recruitment in the erector spinae and multifidus of high school baseball players with terminal-stage lumbar spondylolysis compared with the control.
IV.
腰椎峡部裂是一种常见于年轻运动员的关节突间部缺损，关节突间部在伸展和旋转运动中的应力分布最高。竖脊肌在腰椎稳定中起重要作用；然而，尚无研究评估腰椎峡部裂运动员的竖脊肌特性。
评估腰椎峡部裂运动员的竖脊肌特性。
横断面研究。
实验室。
6 名患有终末期腰椎峡部裂的高中生棒球运动员和 11 名具有相似人体测量特征且无器质性腰椎病变的高中生棒球运动员。
所有受试者均进行无支撑躯干保持试验，同时进行表面肌电图（EMG）功率谱分析，直至力竭。比较峡部裂组和对照组的 EMG 功率谱分析结果。
采用快速傅里叶变换频谱分析，从竖脊肌和多裂肌的原始 EMG 信号中计算躯干保持试验期间的中频（MF）。计算初始 MF 和 MF 斜率。
峡部裂组和对照组的耐力时间无显著差异。峡部裂组的竖脊肌和多裂肌的初始 MF 和 MF 斜率明显低于对照组。
结果表明，与对照组相比，患有终末期腰椎峡部裂的高中生棒球运动员的竖脊肌和多裂肌中快肌运动单位的募集减少。
IV 级。
