Khosravi Fariba, Peolsson Anneli, Karimi Noureddin, Rahnama Leila
Department of Physiotherapy, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran.
Department of Medical and Health Sciences, Division of Physiotherapy, Linköping University, Linköping, Sweden.
J Ultrasound Med. 2019 Feb;38(2):337-345. doi: 10.1002/jum.14693. Epub 2018 May 15.
There are several reports suggesting that forward head posture contributes to alterations in scapular kinematics and muscle activity, leading to the development of shoulder problems. Currently, it is unknown whether forward head posture alters the thickness of the scapular muscles. The aim of this study was to compare the thickness of the serratus anterior and upper and lower trapezius muscles at rest and during loaded isometric contractions in individuals with and without forward head posture.
Twenty individuals with forward head posture and 20 individuals with normal head posture participated in this case-control study. Three separate ultrasound images of the serratus anterior and upper and lower trapezius muscles were captured under 2 randomized conditions: at rest and during a loaded isometric contraction.
The thickness of each muscle significantly increased from rest to the loaded isometric contraction (P < .001). The only difference between the groups was that the thickness of the serratus anterior muscle at rest in the normal-posture group was larger than that in the forward-posture group (P = .01).
Forward head posture appears to be related to atrophy of the serratus anterior muscle, which may contribute to the development of shoulder problems. Further research is required to identify more about the association of forward head posture with the imbalance of shoulder girdle muscles and the impact of head posture on upper quadrant pain.
有几份报告表明，头部前倾姿势会导致肩胛骨运动学和肌肉活动的改变，进而引发肩部问题。目前，尚不清楚头部前倾姿势是否会改变肩胛部肌肉的厚度。本研究的目的是比较有和没有头部前倾姿势的个体在静息状态和负重等长收缩期间前锯肌以及斜方肌上、下束的厚度。
20名头部前倾姿势个体和20名头部姿势正常个体参与了这项病例对照研究。在两种随机条件下采集前锯肌以及斜方肌上、下束的三张独立超声图像：静息状态和负重等长收缩期间。
从静息状态到负重等长收缩，每块肌肉的厚度均显著增加（P < 0.001）。两组之间唯一的差异是，正常姿势组静息状态下前锯肌的厚度大于前倾姿势组（P = 0.01）。
头部前倾姿势似乎与前锯肌萎缩有关，这可能会促使肩部问题的发生。需要进一步研究以更深入了解头部前倾姿势与肩胛带肌肉失衡的关联以及头部姿势对上象限疼痛的影响。
