Otten Roald, Tol Johannes L, Holmich Per, Whiteley Rodney
ASPETAR - Qatar Orthopaedic and Sports Medicine Hospital, Doha, Qatar.
J Sport Rehabil. 2015 Aug;24(3):244-51. doi: 10.1123/jsr.2013-0149. Epub 2014 Jul 23.
Cross-sectional.
Gluteus medius (GM) muscle dysfunction is associated with overuse injury. The GM is functionally composed of 3 separate subdivisions: anterior, middle, and posterior. Clinical assessment of the GM subdivisions is relevant to detect strength and activation deficits and guide specific rehabilitation programs. However, the optimal positions for assessing the strength and activation of these subdivisions are unknown.
The first aim was to establish which strength-testing positions produce the highest surface electromyography (sEMG) activation levels of the individual GM subdivisions. The second aim was to evaluate differences in sEMG activation levels between the tested and contralateral (stabilizing) leg.
Twenty healthy physically active male subjects participated in this study. Muscle activity using sEMG was recorded for the GM subdivisions in 8 different strength-testing positions and analyzed using repeated-measures analysis of variance.
Significant differences between testing positions for all 3 GM subdivisions were found. There were significant differences between the tested and the contralateral anterior and middle GM subdivisions (P < .01). The posterior GM subdivision showed no significant difference (P = .154).
Side-lying in neutral and side-lying with hip internal rotation are the 2 positions recommended to evaluate GM function and guide specific GM rehabilitation.
横断面研究。
臀中肌（GM）功能障碍与过度使用损伤相关。臀中肌在功能上由三个独立的部分组成：前部、中部和后部。对臀中肌各部分进行临床评估对于检测力量和激活缺陷以及指导特定的康复计划具有重要意义。然而，评估这些部分力量和激活的最佳位置尚不清楚。
第一个目标是确定哪些力量测试位置能使臀中肌各部分产生最高的表面肌电图（sEMG）激活水平。第二个目标是评估测试腿和对侧（稳定）腿之间sEMG激活水平的差异。
20名健康的、有体育活动习惯的男性受试者参与了本研究。在8个不同的力量测试位置记录臀中肌各部分的sEMG肌肉活动，并使用重复测量方差分析进行分析。
发现所有三个臀中肌部分在测试位置之间存在显著差异。测试腿与对侧臀中肌前部和中部之间存在显著差异（P <.01）。臀中肌后部没有显著差异（P = 0.154）。
中立位侧卧和髋关节内旋侧卧是推荐用于评估臀中肌功能和指导特定臀中肌康复的两个位置。
