Connelly Christopher M, Moran Matthew F, Grimes Jason K
Motion Analysis Laboratory, Sacred Heart University, Fairfield, CT, USA.
Int J Sports Phys Ther. 2020 Apr;15(2):229-237.
Increased hip adduction and internal rotation during the early stance phase of running have been linked to an increased risk of lower extremity injury. Both the gluteus maximus (GMAX) and gluteus medius (GMED) eccentrically control these motions. GMAX and GMED activation levels during commonly used rehabilitation exercises requires further exploration.
HYPOTHESIS/PURPOSE: The purpose of this study was to compare peak surface electromyography (sEMG) amplitudes of GMAX and GMED between three closed-chain rehabilitation exercises: bilateral hip external rotation with resistance band (BER), forward lunge with resistance band (FL), and single-leg rotational squat (SLS). It was hypothesized that the FL would elicit greater peak amplitude in the GMAX and GMED than SLS and BER.
Descriptive, observational cohort study.
Twenty-two healthy runners (14 male, 8 female) had sEMG electrodes placed bilaterally on GMAX and GMED. Participants completed three repetitions each of BER, FL, and SLS exercises with sEMG data normalized to the maximal amplitude recorded at each muscle during the running trial (% MRC). Seven inertial measurement units affixed to the lower extremity measured joint kinematics to enable the exercises to be split into eccentric and concentric phases respectively.
There were no significant differences between exercises during the eccentric phases with all peak amplitudes for GMAX and GMED being less than < 30% MRC. Both the SLS (GMAX: 48.2 ± 45.2% MRC, p = 0.019; GMED: 39.3 ± 24.8% MRC, p < .001) and FL (GMAX: 65.8 ± 58.9% MRC, p < .001; GMED: 52.2 ± 34.9% MRC, p<.001) elicited significantly greater peak amplitudes than BER (GMAX: 21.7 ± 22.3% MRC; GMED: 22.8 ± 21.2% MRC) during the concentric phase.
Running related injuries have been linked to deficits in GMAX and GMED activation and strength. When averaged bilaterally across 22 healthy runners, peak GMAX and GMED amplitudes during three weight bearing exercises were less than 70% MRC. All three exercises had comparable eccentric peak amplitudes; however, the BER exercise produced a significantly reduced GMAX and GMED amplitude during the concentric phase versus the FL and SLS. The FL and SLS appear equally effective at eliciting peak GMAX and GMED activation.
跑步初期支撑阶段髋关节内收和内旋增加与下肢受伤风险增加有关。臀大肌（GMAX）和臀中肌（GMED）均以离心方式控制这些动作。常用康复锻炼中GMAX和GMED的激活水平有待进一步探究。
假设/目的：本研究的目的是比较三种闭链康复锻炼中GMAX和GMED的表面肌电图（sEMG）峰值幅度：弹力带双侧髋关节外旋（BER）、弹力带前弓步（FL）和单腿旋转深蹲（SLS）。假设FL在GMAX和GMED中引发的峰值幅度大于SLS和BER。
描述性观察性队列研究。
22名健康跑步者（14名男性，8名女性）双侧GMAX和GMED放置sEMG电极。参与者完成BER、FL和SLS锻炼各3次重复，sEMG数据归一化为跑步试验期间各肌肉记录的最大幅度（%MRC）。固定在下肢的7个惯性测量单元测量关节运动学，以便将锻炼分别分为离心和向心阶段。
离心阶段各锻炼之间无显著差异，GMAX和GMED的所有峰值幅度均小于30%MRC。在向心阶段，SLS（GMAX：48.2±45.2%MRC，p = 0.019；GMED：39.3±24.8%MRC，p <.001）和FL（GMAX：65.8±58.9%MRC，p <.001；GMED：52.2±34.9%MRC，p <.001）引发的峰值幅度均显著大于BER（GMAX：21.7±22.3%MRC；GMED：22.8±21.2%MRC）。
与跑步相关的损伤与GMAX和GMED激活及力量不足有关。在22名健康跑步者双侧平均时，三种负重锻炼期间GMAX和GMED的峰值幅度小于70%MRC。所有三种锻炼的离心峰值幅度相当；然而，与FL和SLS相比，BER锻炼在向心阶段产生的GMAX和GMED幅度显著降低。FL和SLS在引发GMAX和GMED峰值激活方面似乎同样有效。
3级
