{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,21]],"date-time":"2026-08-21T12:46:50Z","timestamp":1787316410343,"version":"build-2736575974"},"reference-count":40,"publisher":"Wiley","issue":"8","license":[{"start":{"date-parts":[[2021,5,24]],"date-time":"2021-05-24T00:00:00Z","timestamp":1621814400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Scandinavian Med Sci Sports"],"published-print":{"date-parts":[[2021,8]]},"abstract":"<jats:p>\n                    High\u2010level patellar tendon strain may cause impairments of the tendon's micromorphological integrity in growing athletes and increase the risk for tendinopathy. This study investigated if an evidence\u2010based tendon exercise intervention prevents high\u2010level patellar tendon strain, impairments of micromorphology and pain in adolescent basketball players (male, 13\u201315\u00a0years). At three time points over a season (M1\u20103), tendon mechanical properties were measured using ultrasound and dynamometry, proximal tendon micromorphology with a spatial frequency analysis and pain and disability using VISA\u2010P scores. The control group (CON,\n                    <jats:italic>n<\/jats:italic>\n                    \u00a0=\u00a019) followed the usual strength training plan, including sprint and change\u2010of\u2010direction drills. In the intervention group (INT,\n                    <jats:italic>n<\/jats:italic>\n                    \u00a0=\u00a014), three sessions per week with functional exercises were integrated into the training, providing repetitive high\u2010magnitude tendon loading for at least 3\u00a0s per repetition. The frequency of high\u2010level strain (ie, \u22659%) continuously decreased in INT, while tending to increase in CON since tendon force increased in both (\n                    <jats:italic>p\u00a0<\/jats:italic>\n                    &lt;\u00a00.001), yet tendon stiffness only in INT (\n                    <jats:italic>p<\/jats:italic>\n                    \u00a0=\u00a00.004). In CON, tendon strain was inversely associated with tendon peak spatial frequency at all time points (\n                    <jats:italic>p\u00a0<\/jats:italic>\n                    &lt;\u00a00.05), indicating impairments of tendon micromorphological integrity with higher strain, but not at M2 and M3 in INT. Descriptively, the fraction of asymptomatic athletes at baseline was similar in both groups (~70%) and increased to 100% in M3 in INT, while remaining unchanged in CON. We suggest that functional high\u2010load tendon exercises could reduce the prevalence of high\u2010level patellar tendon strain and associated impairments of its micromorphology in adolescent athletes, providing new opportunities for tendinopathy prevention.\n                  <\/jats:p>","DOI":"10.1111\/sms.13979","type":"journal-article","created":{"date-parts":[[2021,4,28]],"date-time":"2021-04-28T13:49:40Z","timestamp":1619617780000},"page":"1708-1718","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Prevention of strain\u2010induced impairments of patellar tendon micromorphology in adolescent athletes"],"prefix":"10.1111","volume":"31","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7180-7109","authenticated-orcid":false,"given":"Falk","family":"Mersmann","sequence":"first","affiliation":[{"name":"Department of Training and Movement Sciences Humboldt\u2010Universit\u00e4t zu Berlin Berlin 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