Cagnie B, Barbe T, Vandemaele P, Achten E, Cambier D, Danneels L
Department of Rehabilitation Sciences and Physiotherapy, Ghent University, De Pintelaan 185, 3B3, 9000, Ghent, Belgium.
Eur Spine J. 2009 May;18(5):704-9. doi: 10.1007/s00586-009-0898-8. Epub 2009 Feb 12.
All muscles of the neck have a role in motion and postural control of the cervical region. The aim of this study was to investigate the difference in muscle/fat index between (1) cervical flexors and extensors and (2) deep and superficial neck muscles. Twenty-six healthy subjects participated in the study. Magnetic resonance imaging (MRI) was used to quantify muscle fat indices in different cervical flexor and extensor muscles at the C4-C5 level. Overall, the ventral muscles had a significantly lower fat content compared with the dorsal muscles (P < or = 0.001). For the cervical extensors, significant differences between the muscle/fat index of the deep and superficial muscles were found (P < or = 0.001). For the cervical flexors, there were no significant differences between the different muscles. The higher fat content in the dorsal muscles can be explained by a discrepancy in function between the spine extensors and flexors, reflected in a different muscle fiber distribution. The rather small differences between superficial and deep neck muscles are in line with recent findings that have demonstrated that both muscles groups exhibit phasic activity during isometric muscles contractions and the presumption that there is no difference in fiber type distribution between superficial and deep neck muscles.
颈部的所有肌肉在颈椎区域的运动和姿势控制中都发挥着作用。本研究的目的是调查（1）颈部屈肌和伸肌之间以及（2）颈部深层和浅层肌肉之间的肌肉/脂肪指数差异。26名健康受试者参与了该研究。使用磁共振成像（MRI）来量化C4 - C5水平不同颈部屈肌和伸肌的肌肉脂肪指数。总体而言，与背部肌肉相比，腹部肌肉的脂肪含量显著更低（P≤0.001）。对于颈部伸肌，发现深层和浅层肌肉的肌肉/脂肪指数存在显著差异（P≤0.001）。对于颈部屈肌，不同肌肉之间没有显著差异。背部肌肉中较高的脂肪含量可以通过脊柱伸肌和屈肌功能上的差异来解释，这反映在不同的肌纤维分布上。颈部浅层和深层肌肉之间相当小的差异与最近的研究结果一致，这些研究结果表明，在等长肌肉收缩期间，这两组肌肉都表现出阶段性活动，并且推测颈部浅层和深层肌肉之间的纤维类型分布没有差异。
