{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,2]],"date-time":"2026-05-02T09:29:09Z","timestamp":1777714149556,"version":"3.51.4"},"reference-count":38,"publisher":"Wiley","issue":"11","license":[{"start":{"date-parts":[[2023,7,31]],"date-time":"2023-07-31T00:00:00Z","timestamp":1690761600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Scandinavian Med Sci Sports"],"published-print":{"date-parts":[[2023,11]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Background and Objective<\/jats:title><jats:p>Patellar tendinopathy (PT) is a highly prevalent overuse injury in volleyball and is often linked with overloading of the patellar tendon. Little is known, however, about whether and how patellar tendon loading is affected by fatigue during the most challenging jump activity in volleyball. Therefore, this study investigates the effect of a high\u2010intensity, intermittent fatigue protocol on movement alterations in terms of patellar tendon loading during a volleyball spike jump.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Forty\u2010three male volleyball players participated in this study. Three\u2010dimensional full\u2010body kinematics and kinetics were collected when performing a spike jump before and after the fatigue protocol. Sagittal plane joint angles, joint work and patellar tendon loading were calculated and analyzed with curve analyses using paired sample <jats:italic>t<\/jats:italic>\u2010tests to investigate fatigue effects (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.05).<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Fatigue induced a stiffer lower extremity landing strategy together with prolonged pelvis\u2010trunk flexion compared to baseline (<jats:italic>p<\/jats:italic>\u2009=\u20090.001\u20130.005). Decreased patellar tendon forces (<jats:italic>p<\/jats:italic>\u2009=\u20090.001\u20130.010) and less eccentric knee joint work (\u22125%, <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001) were observed after the fatigue protocol compared to baseline.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Protective strategies seem to be utilized in a fatigued state to avoid additional tensile forces acting on the patellar tendon, including proximal compensations and stiff lower extremity landings. We hypothesize that players might be more prone for developing PT if eccentric patellar tendon loads are high in the non\u2010fatigued state and\/or these loads are somehow not decreased after fatigue.<\/jats:p><\/jats:sec>","DOI":"10.1111\/sms.14458","type":"journal-article","created":{"date-parts":[[2023,7,31]],"date-time":"2023-07-31T09:34:32Z","timestamp":1690796072000},"page":"2208-2218","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["The effect of fatigue on spike jump biomechanics in view of patellar tendon loading in volleyball"],"prefix":"10.1111","volume":"33","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7953-7086","authenticated-orcid":false,"given":"Stefan","family":"Vermeulen","sequence":"first","affiliation":[{"name":"Department of Rehabilitation Sciences Ghent University  Ghent Belgium"},{"name":"Department of Rehabilitation Sciences KU Leuven  Leuven 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