Marshall Paul, Murphy Bernadette
Department of Sport and Exercise Science, University of Auckland, New Zealand.
Spine (Phila Pa 1976). 2006 Nov 1;31(23):E877-83. doi: 10.1097/01.brs.0000244557.56735.05.
Pre and post 12-week training study using surface electromyography to measure the flexion relaxation response.
To evaluate whether the active or passive phases of the flexion relaxation measurement changes following an exercise intervention in patients with low back pain.
Impaired neuromuscular activation is an area of specific interest in patients with chronic nonspecific low back pain (LBP). The flexion relaxation phenomenon is commonly measured in LBP patients; however, there is insufficient evidence about the changes in this measure following an intervention.
Fifteen subjects with chronic LBP (7 females, 8 males) performed a 12-week training intervention. The main outcome measures were the Oswestry disability index, visual analog scale, and flexion relaxation response analyzed by the raw electromyograph (EMG) signal, the relative EMG signal, and the flexion relaxation ratio.
Disability and pain scores improved significantly after the 12-week intervention. There were no changes in the active components of the flexion relaxation measurement but an approximate 67% decrease in the amount of activity measured during the relaxation phase at full trunk flexion.
The data suggest that afferent feedback changes may be explaining why there is improved electrical relaxation following an exercise intervention.
采用表面肌电图测量屈曲放松反应的12周训练前后对照研究。
评估腰痛患者运动干预后，屈曲放松测量的主动或被动阶段是否发生变化。
神经肌肉激活受损是慢性非特异性腰痛（LBP）患者特别关注的领域。屈曲放松现象通常在LBP患者中测量；然而，关于干预后该测量指标变化的证据不足。
15名慢性LBP患者（7名女性，8名男性）进行了为期12周的训练干预。主要结局指标包括Oswestry功能障碍指数、视觉模拟量表，以及通过原始肌电图（EMG）信号、相对EMG信号和屈曲放松率分析的屈曲放松反应。
12周干预后，功能障碍和疼痛评分显著改善。屈曲放松测量的主动成分没有变化，但在躯干完全屈曲的放松阶段测量的活动量减少了约67%。
数据表明，传入反馈变化可能解释了运动干预后电放松改善的原因。
