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Megan Q. Beard, Samantha A. Boland and Phillip A. Gribble

hip strength with a handheld dynamometer. Assessment of hip strength is integral when evaluating injuries, treating patients, and developing injury prevention strategies. Patients with a variety of lower extremity pathologies, such as patellofemoral pain syndrome, have demonstrated weak hip abduction

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Gareth Ryan, Heather Johnston and Janice Moreside

there has been considerable research analyzing different ER positions, 2 , 11 – 21 no studies have examined the effect of frontal plane humeral abduction on infraspinatus and posterior deltoid recruitment across a range of angles. Many clinicians anecdotally suggest placing a rolled towel in the

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Peter Francis, Kay Gray and Nic Perrem

Key Points ▸ Hip abductor strength is moderately associated with single-leg dynamic balance as measured by the Y-Balance test (YBT). ▸ The association between hip strength and single-leg dynamic balance is strongest during the posterior reaches of the YBT. ▸ The requirement for greater hip flexion

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Richard A. Brindle, David Ebaugh and Clare E. Milner

Weakness of hip abductor muscles during eccentric loading and associated medial collapse have been hypothesized as an etiology of overuse and noncontact injuries, such as patellofemoral pain syndrome 1 and anterior cruciate ligament tears. 2 Furthermore, hip abductor muscle eccentric

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Bassam A. Nabil, Mariam A. Ameer, Azza M. Abdelmohsen, Abeer F. Hanafy, Ahmed S. Yamani, Naglaa M. Elhafez and Salam M. Elhafez

The strength of the shoulder abductors and external rotators determines the ability of the shoulder joint to swing in golf and tennis playing, which tends to affect the ball drive distance. The literature reported different cases that confirm the importance of shoulder rotation and abduction ranges

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Jennifer E. Earl

Context:

Gluteus medius (GM) contraction during single-leg stance prevents the contralateral pelvis from “dropping,” providing stability for lower extremity motion.

Objective:

To determine which combination of hip rotation and abduction exercise results in the greatest activity of the GM and whether the GM responds to increased loads in these exercises.

Design and Setting:

Repeated measures, laboratory.

Subjects:

20 healthy volunteers.

Interventions:

Resistance (2.26 and 4.53 kg) was provided to 3 variations of a single-leg-stance exercise: hip abduction only, abduction-internal rotation (ABD-IR), and abduction-external rotation.

Measurements:

Muscle activity was recorded from the anterior and middle portions of the GM using surface electromyography.

Results:

ABD-IR produced the most activity in the anterior and middle sections of the GM muscle. The 4.53-kg load produced significantly more activity than the 2.26-kg load (P < .05).

Conclusions:

The GM is most active when performing abduction and internal rotation of the hip. This information could be used to develop GM-strengthening exercises.

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Anh-Dung Nguyen, Jeffrey B. Taylor, Taylor G. Wimbish, Jennifer L. Keith and Kevin R. Ford

observed to land with greater knee extensor moments and lower hip extensor moments when compared with men 2 – 5 and with greater frontal plane knee abduction moments. 5 – 7 Of particular concern is the increase in frontal plane knee loading, as greater external knee abduction moments have been reported

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Robert Rodriguez

), Epstein et al 3 reported that out of 1441 players from 2006 to 2010, 890 sustained a hip or groin injury. Perhaps the most well understood risk factor for groin strains is reduced hip adductor strength. This includes isolated adductor strength and adductor relative to abductor strength (adductor/abductor

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Daniel Viggiani and Jack P. Callaghan

-based changes in fatigability in clinical LBP populations appear to be related to altered neural commands to the muscle rather than fiber composition or atrophy. 29 , 30 Since PDs also have altered neural drive to their hip abductors, they may also demonstrate similar fatigue onset and recovery differences as

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Gretchen D. Oliver, Jessica K. Washington, Sarah S. Gascon, Hillary A. Plummer, Rafael F. Escamilla and James R. Andrews

further investigation into the role of the hip abductors, specifically the gluteus medius, during throwing. The gluteus medius muscle is a primary hip abductor. The anterior fibers function to internally rotate and abduct the hip, whereas the posterior fibers externally rotate and abduct the hip. 13