Mannion A F, Connolly B, Wood K, Dolan P
Dept of Anatomy, University of Bristol, UK.
J Rehabil Res Dev. 1997 Oct;34(4):427-39.
The rate of decline in the median frequency (MF) of the surface EMG power spectrum (MFgrad) has been evaluated for its use in monitoring the fatigability of the erector spinae muscles during the performance of submaximal isometric contractions. MFgrad consistently displayed a highly significant relationship with endurance time for the task (p < 0.05), giving a slightly better correlation for contractions performed in lordotic postures, with the back muscles in a shortened position, than in flexed postures. No significant difference existed between mean MFgrad values recorded from the right and left erector spinae muscles, at either thoracic or lumbar levels. The back extensor muscles of men were more fatigable than those of women, and this has been discussed in relation to corresponding differences in muscle fiber type relative size. Greater erector spinae muscle fatigability was associated with both the existence of, and the risk of developing, serious low back pain. Possible mechanisms for the association, from retrospective and prospective points of view, have been advanced.
在进行次最大等长收缩时，已对表面肌电图功率谱的中位频率（MF）下降速率（MFgrad）进行评估，以用于监测竖脊肌的疲劳性。MFgrad与该任务的耐力时间始终呈现高度显著的关系（p < 0.05），与在脊柱前凸姿势下进行的收缩相比，当背部肌肉处于缩短位置时，MFgrad与耐力时间的相关性略好，而在屈曲姿势下则不然。在胸段或腰段，从左右竖脊肌记录的平均MFgrad值之间没有显著差异。男性的背部伸肌比女性的更容易疲劳，这已结合肌肉纤维类型相对大小的相应差异进行了讨论。竖脊肌更高的疲劳性与严重腰痛的存在和发生风险均相关。已从回顾性和前瞻性角度提出了这种关联的可能机制。
