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Patient and control groups (12 players in each) were selected from a population of 141 well-trained male Norwegian volleyball players, of which 55 (39%) satisfied the diagnostic criteria for jumper's knee. The testing program consisted of a standing jump, a countermovement jump, a 15-second rebound jump test, a standing jump with a 20-kg load, and a standing jump with a load corresponding to one-half of the subject's body weight. Jump height and power were measured using a contact mat connected to an electronic timer. The test results of the patient group were significantly higher than those of the con trol group for the countermovement jump (15% in crease), power during rebound jump (41 %), work done in standing jump (12%) and countermovement jump (22%), and the difference between countermovement jump and standing jump (effect of adding eccentric component). Athletes with jumper's knee demon strated better performance in jump tests than uninjured athletes, particularly in ballistic jumps involving eccen tric force generation.<\/jats:p>","DOI":"10.1177\/036354659602400322","type":"journal-article","created":{"date-parts":[[2007,6,21]],"date-time":"2007-06-21T20:46:52Z","timestamp":1182458812000},"page":"380-385","source":"Crossref","is-referenced-by-count":132,"title":["Characteristics of the Leg Extensors in Male Volleyball Players with Jumper's Knee"],"prefix":"10.1177","volume":"24","author":[{"given":"\u00d8ystein","family":"Lian","sequence":"first","affiliation":[{"name":"Norwegian Volleyball Federation, Rud"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lars","family":"Engebretsen","sequence":"additional","affiliation":[{"name":"Norwegian University of Sport and Physical Education, Oslo, Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rune V.","family":"\u00d8vreb\u00f8","sequence":"additional","affiliation":[{"name":"Norwegian Volleyball Federation, Rud"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Roald","family":"Bahr","sequence":"additional","affiliation":[{"name":"Norwegian Volleyball Federation, Rud, Norwegian University of Sport and Physical Education, Oslo, Norway, Department of Orthopaedic Surgery, University of Minnesota, Minneapolis, Minnesota"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[1996,5,1]]},"reference":[{"key":"atypb1","unstructured":"Bahr R., Hall\u00e9n J., Medb\u00f8 JI: Testing av styrke, spenst og hurtighet, in Testing av idreltsutovere . 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