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Damien Moore, Tania Pizzari, Jodie McClelland and Adam I. Semciw

Context: Many different rehabilitation exercises have been recommended in the literature to target the gluteus medius (GMed) muscle based mainly on single-electrode, surface electromyography (EMG) measures. With the GMed consisting of 3 structurally and functionally independent segments, there is uncertainty on whether these exercises will target the individual segments effectively. Objective: To measure individual GMed segmental activity during 6 common, lower-limb rehabilitation exercises in healthy young adults, and determine if there are significant differences between the exercises for each segment. Method: With fine-wire EMG electrodes inserted into the anterior, middle, and posterior segments of the GMed muscle, 10 healthy young adults performed 6 common, lower-limb rehabilitation exercises. Main Outcome Measures: Recorded EMG activity was normalized, then reported and compared with median activity for each of the GMed segments across the 6 exercises. Results: For the anterior GMed segment, high activity was recorded for the single-leg squat (48% maximum voluntary isometric contraction [MVIC]), the single-leg bridge (44% MVIC), and the resisted hip abduction–extension exercise (41% MVIC). No exercises recorded high activity for the middle GMed segment, but for the posterior GMed segment very high activity was recorded by the resisted hip abduction–extension exercise (69% MVIC), and high activity was generated by the single-leg squat (48% MVIC) and side-lie hip abduction (43% MVIC). For each of the GMed segments, there were significant differences (P < .05) in the median EMG activity levels between some of the exercises and the side-lie clam with large effect sizes favoring these exercises over the side-lie clam. Conclusions: Open-chain hip abduction and single-limb support exercises appear to be effective options for recruiting the individual GMed segments with selection dependent on individual requirements. However, the side-lie clam does not appear to be effective at recruiting the GMed segments, particularly the anterior and middle segments.

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Matthew S. Tenan, Andrew J. Tweedell and Courtney A. Haynes

electromyography . J Appl Biomech . 2017 ; 33 : 464 – 468 . PubMed ID: 28657852 doi:10.1123/jab.2016-0313 28657852 10.1123/jab.2016-0313 2. Tenan MS , Tweedell AJ , Haynes CA . Analysis of statistical and standard algorithms for detecting muscle onset with surface electromyography . PLoS One . 2017

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Jinger S. Gottschall, Bryce Hastings and Zachary Becker

abdominis activation was 51% less during the narrow, 50% less during the middle, and 47% less during the wide hand position bench press in comparison with activation at the parallel push-up hand positions (all values, P  < .001). Figure 1 —Normalized (mean [SD]) surface electromyography for the narrow hand

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Courtney L. Pollock, Michael A. Hunt, Taian M. Vieira, Alessio Gallina, Tanya D. Ivanova and S. Jayne Garland

perpendicular distance between the ankle center and the line of action of the vertical component of the ground reaction force. Electromyography The use of high-density surface electromyography provides sampling from a broad area of each muscle reflecting the global activity of each muscle. High-density surface

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Nickolai Martonick, Kimber Kober, Abigail Watkins, Amanda DiEnno, Carmen Perez, Ashlie Renfro, Songah Chae and Russell Baker

as a preventative measure for ankle trauma by using surface electromyography to assess the effectiveness of KT at facilitating the muscle activation of fibularis longus. 2 The participants stabilized on a balance board with the tested limb as the board was subjected to perturbation from a 10-kg

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Brian Killinger, Jakob D. Lauver, Luke Donovan and John Goetschius

individuals with CAI. Methods Design This study used a cross-over design with counterbalanced conditions in a laboratory setting. Primary independent variables were condition (BFR and control) and exercise sets (set 1, set 2, set 3, and set 4). Primary outcomes included surface electromyography (EMG) muscle

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Jeff A. Nessler, Thomas Hastings, Kevin Greer and Sean C. Newcomer

session with the longboard. Surface electromyography was used to record activity from the erector spinae (lumbar region), mid trapezius, upper trapezius, and upper latissimus dorsi muscles of the right side of each participant (Figure  2 ). Electrodes were placed as follows: erector spinae = approximately

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Nicholas Tam, Ross Tucker, Jordan Santos-Concejero, Danielle Prins and Robert P. Lamberts

VICON MX motion analysis system (Oxford Metrics Ltd, Oxford, UK), sampling at 250 Hz using a modified Helen–Hayes marker set. GRF data were collected using two 900 × 600-mm force platform (AMTI, Watertown, MA), sampling at 2000 Hz, synchronized with the motion capture system. Surface electromyography

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Anna M. Ifarraguerri, Danielle M. Torp, Abbey C. Thomas and Luke Donovan

, Saliba S , Hertel J . Surface electromyography and plantar pressure during walking in young adults with chronic ankle instability . Knee Surg Sports Traumatol Arthrosc . 2016 ; 24 ( 4 ): 1060 – 1070 . PubMed ID: 26856315 doi:10.1007/s00167-016-4015-3 26856315 10.1007/s00167-016-4015-3 14. Donovan

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Michael J. Davies, Bradley Clark, Laura A. Garvican-Lewis, Marijke Welvaert, Christopher J. Gore and Kevin G. Thompson

. Clancy E , Morin EL , Merletti R . Sampling, noise-reduction and amplitude estimation issues in surface electromyography . J Electromyogr Kinesiol . 2002 ; 12 ( 1 ): 1 – 16 . doi:10.1016/S1050-6411(01)00033-5 11804807 10.1016/S1050-6411(01)00033-5 24. Matthews G , Joyner L , Gilliland