{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,28]],"date-time":"2026-09-28T19:08:07Z","timestamp":1790622487502,"version":"4.1.0"},"reference-count":38,"publisher":"National Athletic Trainers' Association","issue":"1","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2012,1,1]]},"abstract":"<jats:sec>\n                  <jats:title>Context:<\/jats:title>\n                  <jats:p>Lower extremity overuse injuries are associated with gluteus medius (GMed) weakness. Understanding the activation of muscles about the hip during strengthening exercises is important for rehabilitation.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Objective:<\/jats:title>\n                  <jats:p>To compare the electromyographic activity produced by the gluteus medius (GMed), tensor fascia latae (TFL), anterior hip flexors (AHF), and gluteus maximus (GMax) during 3 hip-strengthening exercises: hip abduction (ABD), hip abduction with external rotation (ABD-ER), and clamshell (CLAM) exercises.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Design:<\/jats:title>\n                  <jats:p>Controlled laboratory study.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Setting:<\/jats:title>\n                  <jats:p>Laboratory.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Patients or Other Participants:<\/jats:title>\n                  <jats:p>Twenty healthy runners (9 men, 11 women; age = 25.45 \u00b1 5.80 years, height = 1.71 \u00b1 0.07 m, mass = 64.43 \u00b1 7.75 kg) participated.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Intervention(s):<\/jats:title>\n                  <jats:p>A weight equal to 5% body mass was affixed to the ankle for the ABD and ABD-ER exercises, and an equivalent load was affixed for the CLAM exercise. A pressure biofeedback unit was placed beneath the trunk to provide positional feedback.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Main Outcome Measure(s):<\/jats:title>\n                  <jats:p>Surface electromyography (root mean square normalized to maximal voluntary isometric contraction) was recorded over the GMed, TFL, AHF, and GMax.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Results:<\/jats:title>\n                  <jats:p>Three 1-way, repeated-measures analyses of variance indicated differences for muscle activity among the ABD (F3,57 = 25.903, P&amp;lt;.001), ABD-ER (F3,57 = 10.458, P&amp;lt;.001), and CLAM (F3,57 = 4.640, P=.006) exercises. For the ABD exercise, the GMed (70.1 \u00b1 29.9%), TFL (54.3 \u00b1 19.1%), and AHF (28.2 \u00b1 21.5%) differed in muscle activity. The GMax (25.3 \u00b1 24.6%) was less active than the GMed and TFL but was not different from the AHF. For the ABD-ER exercise, the TFL (70.9 \u00b1 17.2%) was more active than the AHF (54.3 \u00b1 24.8%), GMed (53.03 \u00b1 28.4%), and GMax (31.7 \u00b1 24.1 %). For the CLAM exercise, the AHF (54.2 \u00b1 25.2%) was more active than the TFL (34.4 \u00b1 20.1%) and GMed (32.6 \u00b1 16.9%) but was not different from the GMax (34.2 \u00b1 24.8%).<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Conclusions:<\/jats:title>\n                  <jats:p>The ABD exercise is preferred if targeted activation of the GMed is a goal. Activation of the other muscles in the ABD-ER and CLAM exercises exceeded that of GMed, which might indicate the exercises are less appropriate when the primary goal is the GMed activation and strengthening.<\/jats:p>\n               <\/jats:sec>","DOI":"10.4085\/1062-6050-47.1.15","type":"journal-article","created":{"date-parts":[[2017,3,2]],"date-time":"2017-03-02T14:56:34Z","timestamp":1488466594000},"page":"15-23","source":"Crossref","is-referenced-by-count":60,"title":["Hip Muscle Activity During 3 Side-Lying Hip-Strengthening Exercises in Distance Runners"],"prefix":"10.4085","volume":"47","author":[{"given":"Joseph M.","family":"McBeth","sequence":"first","affiliation":[{"name":"University of Nevada, Reno"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jennifer E.","family":"Earl-Boehm","sequence":"first","affiliation":[{"name":"Athletic Training Education Program, University of Wisconsin\u2013Milwaukee"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stephen C.","family":"Cobb","sequence":"first","affiliation":[{"name":"Athletic Training Education Program, University of Wisconsin\u2013Milwaukee"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wendy E.","family":"Huddleston","sequence":"first","affiliation":[{"name":"Human Movement Sciences, University of Wisconsin\u2013Milwaukee"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"2557","reference":[{"issue":"1","key":"2020060408315664500_i1062-6050-47-1-15-b1","first-page":"120","article-title":"A review of anthropometric, biome-chanical, neuromuscular, and training related factors associated with injury in runners.","volume":"7","author":"Ryan","year":"2006","journal-title":"Int Sportmed J."},{"issue":"5","key":"2020060408315664500_i1062-6050-47-1-15-b2","doi-asserted-by":"crossref","first-page":"320","DOI":"10.2165\/00007256-199214050-00004","article-title":"Running injuries: a review of the epidemiological literature.","volume":"14","author":"van Mechelen","year":"1992","journal-title":"Sports Med."},{"issue":"1","key":"2020060408315664500_i1062-6050-47-1-15-b3","doi-asserted-by":"crossref","first-page":"95","DOI":"10.1136\/bjsm.36.2.95","article-title":"A retrospective case-control analysis of 2002 running injuries.","volume":"36","author":"Taunton","year":"2002","journal-title":"Br J Sports Med."},{"issue":"8","key":"2020060408315664500_i1062-6050-47-1-15-b4","doi-asserted-by":"crossref","first-page":"469","DOI":"10.1136\/bjsm.2006.033548","article-title":"Incidence and determinants of lower extremity running injuries in long distance runners: a systematic review.","volume":"41","author":"van Gent","year":"2007","journal-title":"Br J Sports Med."},{"issue":"1","key":"2020060408315664500_i1062-6050-47-1-15-b5","doi-asserted-by":"crossref","first-page":"42","DOI":"10.2519\/jospt.2010.3337","article-title":"The influence of abnormal hip mechanics on knee injury: a biomechanical perspective.","volume":"40","author":"Powers","year":"2010","journal-title":"J. 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