{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T10:55:58Z","timestamp":1789728958732,"version":"4.0.1"},"reference-count":35,"publisher":"National Athletic Trainers' Association","issue":"4","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2011]]},"abstract":"\n \n Context:<\/jats:italic>\n <\/jats:bold> Glenohumeral external rotation (GH ER) muscle fatigue might contribute to shoulder injuries in overhead athletes. Few researchers have examined the effect of such fatigue on scapular kinematics and muscle activation during a functional movement pattern.<\/jats:p>\n \n \n Objective:<\/jats:italic>\n <\/jats:bold> To examine the effects of GH ER muscle fatigue on upper trapezius, lower trapezius, serratus anterior, and infraspinatus muscle activation and to examine scapular kinematics during a diagonal movement task in overhead athletes.<\/jats:p>\n \n \n Setting:<\/jats:italic>\n <\/jats:bold> Human performance research laboratory.<\/jats:p>\n \n \n Design:<\/jats:italic>\n <\/jats:bold> Descriptive laboratory study.<\/jats:p>\n \n \n Patients or Other Participants:<\/jats:italic>\n <\/jats:bold> Our study included 25 overhead athletes (15 men, 10 women; age = 20 \u00b1 2 years, height = 180 \u00b1 11 cm, mass = 80 \u00b1 11 kg) without a history of shoulder pain on the dominant side.<\/jats:p>\n \n \n Intervention(s):<\/jats:italic>\n <\/jats:bold> We tested the healthy, dominant shoulder through a diagonal movement task before and after a fatiguing exercise involving low-resistance, high-repetition, prone GH ER from 0\u00b0 to 75\u00b0 with the shoulder in 90\u00b0 of abduction.<\/jats:p>\n \n \n Main Outcome Measure(s):<\/jats:italic>\n <\/jats:bold> Surface electromyography was used to measure muscle activity for the upper trapezius, lower trapezius, serratus anterior, and infraspinatus. An electromyographic motion analysis system was used to assess 3-dimensional scapular kinematics. Repeated-measures analyses of variance (phase \u00d7 condition) were used to test for differences.<\/jats:p>\n \n \n Results:<\/jats:italic>\n <\/jats:bold> We found a decrease in ascending-phase and descending-phase lower trapezius activity (F<\/jats:italic>1,25<\/jats:sub> = 5.098, P<\/jats:italic> = .03) and an increase in descending-phase infraspinatus activity (F<\/jats:italic>1,25<\/jats:sub> = 5.534, P<\/jats:italic> = .03) after the fatigue protocol. We also found an increase in scapular upward rotation (F<\/jats:italic>1,24<\/jats:sub> = 3.7, P<\/jats:italic> = .04) postfatigue.<\/jats:p>\n \n \n Conclusions:<\/jats:italic>\n <\/jats:bold> The GH ER muscle fatigue protocol used in this study caused decreased lower trapezius and increased infraspinatus activation concurrent with increased scapular upward rotation range of motion during the functional task. This highlights the interdependence of scapular and glenohumeral force couples. Fatigue-induced alterations in the lower trapezius might predispose the infraspinatus to injury through chronically increased activation.<\/jats:p>","DOI":"10.4085\/1062-6050-46.4.349","type":"journal-article","created":{"date-parts":[[2017,3,2]],"date-time":"2017-03-02T15:20:48Z","timestamp":1488468048000},"page":"349-357","source":"Crossref","is-referenced-by-count":45,"title":["Shoulder External Rotation Fatigue and Scapular Muscle Activation and Kinematics in Overhead Athletes"],"prefix":"10.4085","volume":"46","author":[{"given":"Mithun","family":"Joshi","sequence":"first","affiliation":[{"name":"\u2020University of Sydney, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Charles A.","family":"Thigpen","sequence":"additional","affiliation":[{"name":"*Proaxis Therapy, Greenville, SC"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kevin","family":"Bunn","sequence":"additional","affiliation":[{"name":"\u2021University of North Carolina, Chapel Hill"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Spero G.","family":"Karas","sequence":"additional","affiliation":[{"name":"\u00a7Emory University, Atlanta, GA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Darin A.","family":"Padua","sequence":"additional","affiliation":[{"name":"\u00b6Department of Exercise & Sport Science, University of North Carolina, Chapel Hill"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"2557","reference":[{"issue":"3","key":"i1062-6050-46-4-349-b1","series-title":"Br J Sports Med.","first-page":"173","article-title":"Epidemiology of shoulder impingement in upper arm sports events","volume":"24","year":"1990","unstructured":"Lo\n YPC\n , HsuYCS, ChanKM.\n Epidemiology of shoulder impingement in upper arm sports events. 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