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dc.contributor.authorHelland, Christian
dc.contributor.authorBojsen-Møller, Jens
dc.contributor.authorRaastad, Truls
dc.contributor.authorSeynnes, Olivier R.
dc.contributor.authorMoltubakk, Marie M.
dc.contributor.authorJakobsen, Vidar
dc.contributor.authorBahr, Roald
dc.date.accessioned2014-01-14T10:38:15Z
dc.date.available2014-01-14T10:38:15Z
dc.date.issued2013
dc.identifierSeksjon for fysisk prestasjonsevne / Department of Physical Performance
dc.identifier.citationBritish Journal of Sports Medicine. 2013, 47, 862-868no_NO
dc.identifier.urihttp://hdl.handle.net/11250/171184
dc.descriptionI Brage finner du siste tekst-versjon av artikkelen, og den kan inneholde ubetydelige forskjeller fra forlagets pdf-versjon. Forlagets pdf-versjon finner du på bjsm.bmj.com: http://dx.doi.org/10.1136/bjsports-2013-092275 / In Brage you'll find the final text version of the article, and it may contain insignificant differences from the journal's pdf version. The definitive version is available at bjsm.bmj.com: http://dx.doi.org/10.1136/bjsports-2013-092275no_NO
dc.description.abstractBackground: Although differences in mechanical properties between symptomatic and healthy tendons have been observed for the Achilles tendon, the impact of tendinopathy on patellar tendon mechanics is not fully documented. The aim of the present case–control study was to assess the mechanical properties of the tendon and jump performance in elite athletes with and without patellar tendinopathy. Methods: We identified 17 male volleyball players with patellar tendinopathy and 18 healthy matched controls from a 5-year prospective cohort study on junior elite volleyball players. Outcome variables included three measures of maximal vertical jump performance and ultrasound-based assessments of patellar tendon cross-sectional area, stiffness and Young's modulus. Results The proximal cross-sectional area of the patellar tendon was significantly larger in the tendinopathic group (133±11 vs 112±9 mm2, respectively; p<0.001). Pathological tendons presented lower stiffness (2254±280 vs 2826±603 N/mm, respectively; p=0.006) and Young's modulus (0.99±0.16 vs 1.17±0.25 GPa, respectively; p=0.04) than healthy tendons. However, the difference between the countermovement jump height and the squat jump height (3.4±2.2 vs 1.2±1.5 cm, p=0.005) was significantly higher in the tendinopathic group compared with the control group. Conclusions: Patellar tendinopathy is associated with a decrease in the mechanical and material properties of the tendon in elite athletes subjected to a high volume of jumping activity. However, compared with their healthy counterparts, tendinopathic volleyball players have a better ability to utilise the stretch-shortening cycle when jumping.no_NO
dc.language.isoengno_NO
dc.publisherBMJ Publishing Groupno_NO
dc.subjectadult
dc.subjectbiomechanical phenomena / physiology
dc.subjectcase-control studies
dc.subjectelasticity / physiology
dc.subjectelectromyography
dc.subjectexercise / physiology
dc.subjectisometric contraction / physiology
dc.subjectmuscle, skeletal / physiology
dc.subjectpatellar ligament / anatomy & histology, physiology
dc.subjectprospective studies
dc.subjecttendinopathy / pathology, physiopathology
dc.subjectvolleyball / injuries
dc.subjectyoung adult
dc.titleMechanical properties of the patellar tendon in elite volleyball players with and without patellar tendinopathyno_NO
dc.typeJournal articleno_NO
dc.typePeer reviewedno_NO
dc.subject.nsiVDP::Social science: 200::Social science in sports: 330::Other subjects within physical education: 339no_NO
dc.source.journalBritish Journal of Sports Medicineno_NO
dc.identifier.doi10.1136/bjsports-2013-092275


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