Watanabe S, Eguchi A, Kobara K, Ishida H, Otsuki K
Department of Rehabilitation, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, 288, Matsushima, Kurashiki City 701-0193, Japan.
Electromyogr Clin Neurophysiol. 2006 Sep;46(5):311-5.
Recently, active treatment such as exercise has been increasingly advocated for CLBP (chronic low back pain). Specially, exercise to improve fitness has been recommended for the prevention of back injuries. The bicycle ergometer or walking have often been used to improve the fitness of CLBP patients. However, little is known about the activity levels of the trunk muscles during such exercise. In this study, the electromyographic (EMG) activities of the trunk muscles during bicycle ergometer exercises and walking were compared and the load level on these muscles during such exercises was investigated. The present study provides basic information concerning fitness exercise in CLBP patients. Eleven healthy male volunteers (21.7 +/- 2.5 years old) without low back pain participated in the study. Bipolar surface electrodes were attached to the right side of the rectus abdominis, the obliquus externus abdominis and lower back extensor muscles (L3). EMG signals were continuously recorded while walking and during gradual loading exercises and normalized to maximal voluntary contractions (% MVC). One way analysis of variance (ANOVA) was performed on the % MVC from each exercise and walking for each of the three trunk muscle sites (p < 0.05). The rectus abdominis muscle showed activity of about 6% MVC during any grade of exercise and walking and no significant differences were found between these forms of exercise. The obliquus externus abdominis muscle showed about 30% MVC during any grade of exercise and walking, but no significant difference was found between them. The low back muscles showed activity of about 12% MVC while walking, whereas activity level increased as the exercise load using the bicycle ergometer increased. More significant low back muscles activity was observed while walking than during exercises of 25 w and 50 w. The results of this study indicated that exercise using the bicycle ergometer should be useful for maintaining or improving fitness in CLBP patients, because it results in less load on the trunk muscles and relatively more oxygen uptake than walking.
最近，诸如运动等积极治疗方法越来越多地被提倡用于慢性下腰痛（CLBP）。特别地，为预防背部损伤，建议进行提高身体素质的运动。自行车测力计运动或步行常被用于改善CLBP患者的身体素质。然而，对于此类运动过程中躯干肌肉的活动水平却知之甚少。在本研究中，比较了自行车测力计运动和步行过程中躯干肌肉的肌电图（EMG）活动，并研究了此类运动过程中这些肌肉的负荷水平。本研究提供了有关CLBP患者健身运动的基础信息。11名无下腰痛的健康男性志愿者（21.7±2.5岁）参与了本研究。将双极表面电极附着于腹直肌右侧、腹外斜肌和下背部伸肌（L3）。在步行和逐渐增加负荷的运动过程中持续记录EMG信号，并将其归一化为最大自主收缩（%MVC）。对三个躯干肌肉部位在每次运动和步行时的%MVC进行单因素方差分析（ANOVA）（p<0.05）。腹直肌在任何运动等级和步行过程中均显示约6%MVC的活动，且这些运动形式之间未发现显著差异。腹外斜肌在任何运动等级和步行过程中均显示约30%MVC的活动，但它们之间未发现显著差异。下背部肌肉在步行时显示约12%MVC的活动，而随着使用自行车测力计的运动负荷增加，活动水平升高。与25瓦和50瓦的运动相比，步行时观察到下背部肌肉的活动更显著。本研究结果表明，使用自行车测力计进行运动对于维持或改善CLBP患者的身体素质应该是有用的，因为它导致躯干肌肉的负荷较小，且比步行相对摄取更多氧气。
