22 Researchers 22 have shown that practice trials decrease the learning effect of this test. Participants performed the SEBT by standing on the dominant limb and reaching with the contralateral limb as far as possible in the anterior, posteromedial, and posterolateral directions.
ABDUCTION EXERCISE TRIAL
19 A trial was considered unsuccessful if the contralateral foot touched the force plate, ground, or testing limb the participant fell off or hopped on the force plate or the participant lifted the heel of the testing limb. Intraclass correlation coefficients have been reported to range from 0.41 to 0.79 for measures of velocity, range, and variability. The means of the 2 pretrials and the 2 posttrials served as the dependent variable.
Measurements of static balance included the COP velocity, COP area, standard deviation (SD) in the anteroposterior direction, and SD in the mediolateral direction. 18–20 Participants performed 4 15-second trials they performed 2 trials before and 2 trials after the fatiguing task and rested 15 seconds between trials. They were instructed to maintain a single-legged stance on the test leg with their eyes open while concentrating on a picture at eye level on the wall in front of them and holding the nonstance limb at approximately 45° of knee flexion and 30° of hip flexion. Participants performed static balance testing while standing barefoot on the dominant limb, remaining as still as possible, and with their eyes open. We hypothesized that increases in fatigue of the GMed, as determined by a shift in median frequency, would cause immediate deterioration in postural control and quality of movement in healthy participants. 14–16 Therefore, the purpose of our study was to compare postural control and quality of movement between men and women after a fatiguing hip-abduction exercise. Furthermore, a discovery of different responses in men and women might help explain higher rates of knee injuries in female athletes. 11, 12 Researchers 6, 13 have examined the effect of hip and ankle fatigue on postural control however, they did not specifically quantify the extent of muscle fatigue using electromyography (EMG). 10 Gluteus medius (GMed) dysfunction is a common cause of insufficient hip abduction and external rotation strength that is often associated with decreases in postural control.
9 The role of hip abduction and external rotation strength in core stability is important in the prevention of lower extremity injuries. Hip joint musculature is exceptionally important for adequate pelvic and trunk stabilization during ambulation.
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At similar levels of local muscle fatigue, men and women had similar measurements of postural control. 05).Ĭonclusions: Our findings suggest that postural control and quality of movement were affected negatively after a GMed-fatiguing exercise. 05) however, we found main effects for time with all of our postfatigue outcome measures ( P ≤. Results: We observed no differences in balance deficits between sexes ( P >. Main Outcome Measure(s): Baseline and postfatigue measurements of single-leg static balance, dynamic balance, and quality of movement assessed with center-of-pressure measurements, the Star Excursion Balance Test, and lateral step-down test, respectively, were recorded for the dominant lower extremity (as identified by the participant). Intervention(s): Participants followed a fatiguing protocol that involved a side-lying hip-abduction exercise performed until a 15% shift in electromyographic median frequency of the GMed was reached. Patients or Other Participants: Eighteen men (age = 22 ± 3.64 years, height = 183.37 ± 8.30 cm, mass = 87.02 ☑2.53 kg) and 18 women (age = 22 ± 3.14, height = 167.65 ± 5.80 cm, mass = 66.64 ± 10.49 kg) with no history of low back or lower extremity injury participated in our study. Objective: To compare postural control and quality of movement between men and women after a fatiguing hip-abduction exercise. Men and women might have different muscular recruitment patterns in response to GMed fatigue. Context: Fatigue of the gluteus medius (GMed) muscle might be associated with decreases in postural control due to insufficient pelvic stabilization.
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