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The muscle strength and thickness increased comparably in both groups, with an average increase of ~20% in isometric knee flexor moment and 14% in eccentric knee flexor moment (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.001 for both tests). ST muscle thickness increased by ~4% on average (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.016), while no main effect of training was observed for SM and BFlh thickness. The shear modulus of the SM muscle decreased by 9% (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.021) for the combined groups. However, it remained unchanged in the BFlh and ST muscles, and OC use did not influence these measurements either.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>These findings suggest that eccentric training induces similar adaptations in women regardless of OC use. Furthermore, fascicle lengthening was not attributable to changes in muscle shear modulus under the present conditions.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s00421-025-05753-x","type":"journal-article","created":{"date-parts":[[2025,3,15]],"date-time":"2025-03-15T09:04:07Z","timestamp":1742029447000},"page":"2133-2144","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Eccentric training effects on hamstring muscles in oral contraceptive users and naturally menstruating women"],"prefix":"10.1007","volume":"125","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1289-246X","authenticated-orcid":false,"given":"Olivier","family":"Seynnes","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7276-4793","authenticated-orcid":false,"given":"Antoine","family":"Nordez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9664-8121","authenticated-orcid":false,"given":"Lilian","family":"Lacourpaille","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eirik","family":"Hesseberg","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ingvild","family":"Vesterhus","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ken","family":"Fjeldberg","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Martin Kvalvik","family":"Engstad","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9383-8202","authenticated-orcid":false,"given":"Mette","family":"Hansen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6350-0112","authenticated-orcid":false,"given":"G\u00f8ran","family":"Paulsen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,3,15]]},"reference":[{"key":"5753_CR1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jshs.2024.100996","volume":"14","author":"MH Andrews","year":"2024","unstructured":"Andrews MH, Pai A, Gurchiek RD et al (2024) Multiscale hamstring muscle adaptations following 9\u00a0weeks of eccentric training. 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