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The GM tendon force\u2013elongation relationship was measured in 13 ASP (mean\u2009\u00b1\u2009SD height 1.81\u2009\u00b1\u20090.07\u00a0m; mass 73.6\u2009\u00b1\u20095.4\u00a0kg; age 18.8\u2009\u00b1\u20091.2\u00a0years) and 11 CON (1.74\u2009\u00b1\u20090.05\u00a0m; 71.2\u2009\u00b1\u20097.6\u00a0kg; 22.3\u2009\u00b1\u20093.0\u00a0years) using a combination of dynamometry, ultrasonography and electromyography. Participants also performed a series of unilateral and bilateral countermovement jumps (CMJ) and bilateral drop jumps on a force platform. GM tendon properties did not differ between groups but maximal tendon elongation correlated inversely with unilateral vertical CMJ peak power (<jats:italic>r<\/jats:italic>\u2009=\u2009\u22120.427, <jats:italic>P<\/jats:italic>\u2009=\u20090.037). Furthermore, leg stiffness and peak force during a drop jump correlated with GM tendon stiffness (<jats:italic>r<\/jats:italic>\u2009=\u20090.431\u20130.462, <jats:italic>P<\/jats:italic>\u2009=\u20090.035\u20130.023), maximal tendon force and Achilles tendon CSA (<jats:italic>r<\/jats:italic>\u2009=\u20090.409\u20130.737, P\u2009\u2264\u20090.047). These results suggest that GM tendon properties do not differ between ASP and CON but a stiffer GM tendon may facilitate the production of larger forces to increase power output during a unilateral vertical CMJ. Furthermore, higher force and stiffness outputs are achieved during a drop jump by stronger individuals with larger and stiffer GM tendons, which could lead to greater pitch-based performance and may represent a protective mechanism to shield the tendon against injury.<\/jats:p>","DOI":"10.1007\/s00421-025-05763-9","type":"journal-article","created":{"date-parts":[[2025,4,8]],"date-time":"2025-04-08T17:29:05Z","timestamp":1744133345000},"page":"2597-2609","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Gastrocnemius medialis tendon properties do not differ between male academy soccer players and control participants but are related to jump performance"],"prefix":"10.1007","volume":"125","author":[{"given":"David C.","family":"Robshaw","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Conall F.","family":"Murtagh","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Barry","family":"Drust","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5705-0207","authenticated-orcid":false,"given":"Robert M.","family":"Erskine","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,4,8]]},"reference":[{"issue":"3","key":"5763_CR1","doi-asserted-by":"publisher","first-page":"280","DOI":"10.1115\/1.3138494","volume":"106","author":"KN An","year":"1984","unstructured":"An KN, Takahashi K, Harrigan TP, Chao EY (1984) Determination of muscle orientations and moment arms. 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