Physical Therapy & Rehabilitation Sciences Department, College of Nursing & Health Professions, Drexel University, Philadelphia, PA, USA.
Physical Therapy & Rehabilitation Sciences Department, College of Nursing & Health Professions, Drexel University, Philadelphia, PA, USA.
Braz J Phys Ther. 2018 Nov-Dec;22(6):519-526. doi: 10.1016/j.bjpt.2018.05.003. Epub 2018 Jun 6.
Individuals with short resting pectoralis minor muscle length have been shown to have aberrant scapulothoracic motion when compared to individuals with long resting pectoralis minor muscle length. However, the degree to which the pectoralis minor muscle can be lengthened and whether or not scapulothoracic motion differs between individuals with short and typical resting pectoralis minor muscle length is unknown.
To determine if: (1) pectoralis minor muscle elongation (percent pectoralis minor muscle can be actively and passively lengthened beyond resting length), (2) pectoralis minor muscle percent length change during overhead reaching, and (3) scapulothoracic motion during overhead reaching differ between individuals with short and typical resting pectoralis minor muscle length.
Two group comparison.
Thirty healthy individuals were placed into a short or typical resting pectoralis minor muscle length group. A caliper was used to measure resting pectoralis minor muscle length and pectoralis minor muscle length during active and passive muscle lengthening. An electromagnetic tracking system was used to measure pectoralis minor muscle length change as well as scapular, humeral, and trunk motion during several arm elevation tasks. Pectoralis minor muscle elongation and length change during arm elevation tasks were compared between groups using independent t-tests. Two-factor mixed-model analyses of variance were used to compare scapulothoracic motion at arm elevation angles of 30°, 60°, 90°, and 120°.
Pectoralis minor muscle elongation and pectoralis minor muscle length change during arm elevation did not differ between groups. Scapulothoracic motion did not differ between groups across arm elevation tasks.
Although resting pectoralis minor muscle length differed between groups, pectoralis minor muscle lengthening and scapulothoracic motion were similar between participants with short and typical resting pectoralis minor muscle length. Additional studies are needed to better understand the role of pectoralis minor muscle elongation on scapulothoracic motion.
与 resting pectoralis minor muscle length 较长的个体相比，resting pectoralis minor muscle length 较短的个体在肩胛胸壁运动方面表现出异常。然而，目前尚不清楚 resting pectoralis minor muscle 可以被拉长的程度，以及 resting pectoralis minor muscle length 较短和典型的个体之间的肩胛胸壁运动是否存在差异。
确定以下方面是否存在差异：（1）resting pectoralis minor muscle 的伸长（resting length 以外的主动和被动拉伸的 pectoralis minor muscle 百分比），（2）在过头伸展过程中 pectoralis minor muscle 的百分比长度变化，以及（3）在过头伸展过程中肩胛胸壁运动。
两组比较。
将 30 名健康个体分为 resting pectoralis minor muscle length 较短或典型的组。使用卡尺测量 resting pectoralis minor muscle length 和主动和被动肌肉拉伸过程中的 pectoralis minor muscle length。使用电磁跟踪系统测量在几个手臂抬高任务中 pectoralis minor muscle 长度变化以及肩胛骨、肱骨和躯干运动。使用独立 t 检验比较组间 arm elevation tasks 期间的 resting pectoralis minor muscle 伸长和长度变化。使用双因素混合模型方差分析比较在手臂抬高角度为 30°、60°、90°和 120°时的肩胛胸壁运动。
在 arm elevation tasks 期间，resting pectoralis minor muscle 的伸长和长度变化在组间没有差异。在 arm elevation tasks 中，肩胛胸壁运动在组间没有差异。
尽管 resting pectoralis minor muscle length 在组间存在差异，但短和典型 resting pectoralis minor muscle length 的个体在 resting pectoralis minor muscle 拉长和肩胛胸壁运动方面相似。需要进一步的研究来更好地了解 resting pectoralis minor muscle 伸长对肩胛胸壁运动的作用。
