University of Waterloo, Waterloo, Ontario, Canada.
Phys Ther. 2010 Apr;90(4):572-80. doi: 10.2522/ptj.20090024. Epub 2010 Feb 4.
Manual muscle tests (MMTs) are used in clinical settings to evaluate the function and strength (force-generating capacity) of a specific muscle in a position at which the muscle is believed to be most isolated from other synergists and antagonists. Despite frequent use of MMTs, few electromyographic evaluations exist to confirm the ability of MMTs to isolate rotator cuff muscles.
This study examined rotator cuff isolation during 29 shoulder muscle force tests (9 clinical and 20 generic tests).
An experimental design was used in this study.
Electromyographic data were recorded from 4 rotator cuff muscles and 10 additional shoulder muscles of 12 male participants. Maximal isolation ratios (mean specific rotator cuff muscle activation to mean activation of the other 13 recorded muscles) defined which of these tests most isolated the rotator cuff muscles.
Three rotator cuff muscles were maximally isolated (obtained highest isolation ratios) within their respective clinical test groups (lateral rotator test group for the infraspinatus and teres minor muscles and abduction test group for the supraspinatus muscle). The subscapularis muscle was maximally isolated equally as effectively within the generic ulnar force and clinical medial rotation groups. Similarly, the supraspinatus and teres minor muscles were isolated equally as effectively in some generic test groups as they were in their respective clinical test groups.
Postural artifact in the wire electrodes caused exclusion of some channels from calculations. The grouping of muscle force tests based on test criteria (clinical or generic tests and muscle action) may have influenced which groups most isolated the muscle of interest.
The results confirmed the appropriateness of 9 commonly used clinical tests for isolating rotator cuff muscles, but suggested that several other muscle force tests were equally appropriate for isolating these muscles.
在临床环境中，手动肌肉测试（MMTs）用于评估特定肌肉在被认为最能与协同肌和拮抗肌分离的位置的功能和力量（产生力的能力）。尽管 MMTs 经常被使用，但很少有肌电图评估存在，以确认 MMTs 分离肩袖肌肉的能力。
本研究检查了 29 项肩部肌肉力量测试（9 项临床和 20 项通用测试）中的肩袖隔离情况。
本研究采用实验设计。
对 12 名男性参与者的 4 个肩袖肌肉和 10 个额外的肩部肌肉进行肌电图记录。最大隔离比（特定肩袖肌肉的平均激活与其他 13 个记录肌肉的平均激活）定义了这些测试中哪些最能隔离肩袖肌肉。
在各自的临床测试组内，三个肩袖肌肉（外展测试组的冈下肌和小圆肌以及外旋测试组的冈上肌）得到最大的隔离（获得最高的隔离比）。肩胛下肌在通用的尺骨力量和临床内旋组内同样有效地得到最大隔离。同样，在一些通用测试组中，冈上肌和小圆肌的隔离效果与在各自的临床测试组中一样有效。
导联上的姿势伪影导致一些通道被排除在计算之外。肌肉力量测试的分组基于测试标准（临床或通用测试和肌肉动作）可能会影响到哪些组最能隔离感兴趣的肌肉。
结果证实了 9 种常用的临床测试用于隔离肩袖肌肉的适当性，但也表明了其他几种肌肉力量测试同样适用于隔离这些肌肉。
