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Elastic band resistance training (EBT) offers a practical alternative.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Hypothesis:<\/jats:title>\n                    <jats:p>A 9-week EBT program will enhance lower-limb strength, vertical jump, and change-of-direction (COD) speed in trained and highly trained female soccer players.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Study Design:<\/jats:title>\n                    <jats:p>Randomized controlled trial.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Level of Evidence:<\/jats:title>\n                    <jats:p>Level 2.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods:<\/jats:title>\n                    <jats:p>A total of 74 players were divided into Under-15 (U15; n\u2009=\u200925), Under-19 (U19; n\u2009=\u200925), and Senior (n\u2009=\u200924) groups. Each age group was assigned randomly to an experimental or control group. The intervention was integrated into the in-season regimen, performed twice weekly before training sessions, over 9\u2009weeks. The training protocol included 6 resistance exercises split across 2 weekly circuit-based sessions. Isometric knee extension (KE) and knee flexion (KF) strength, countermovement jump (CMJ) height and power, and T-test performance were evaluated pre- and postintervention and after a 3-week detraining period.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results:<\/jats:title>\n                    <jats:p>\n                      Difference-in-differences ordinary least squares regression analysis revealed improvements in U19 KE strength of the dominant and nondominant leg (coefficient\u2009=\u2009132.90\u2009N;\n                      <jats:italic toggle=\"yes\">P<\/jats:italic>\n                      \u2009=\u20090.03 and 131.59\u2009N;\n                      <jats:italic toggle=\"yes\">P<\/jats:italic>\n                      \u2009=\u20090.05, respectively). KF strength improved marginally in U15 and Senior groups. Senior players also showed a nonsignificant positive trend towards CMJ power (coefficient\u2009=\u2009581.08\u2009W;\n                      <jats:italic toggle=\"yes\">P<\/jats:italic>\n                      \u2009=\u20090.09), with no relevant changes in CMJ height or T-test. After detraining, strength gains declined across all groups, while CMJ and T-test metrics remained stable.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion:<\/jats:title>\n                    <jats:p>EBT enhances knee strength effectively, particularly in older age groups, but its influence on vertical jump and COD speed is limited. The reversal of strength gains after short-term detraining highlights the importance of consistent training for sustained athletic development.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Clinical Relevance:<\/jats:title>\n                    <jats:p>EBT is a practical, low-cost method to improve lower-limb muscle strength in female soccer players and can be integrated easily into in-season training when traditional equipment is unavailable.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/19417381261490002","type":"journal-article","created":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T06:30:27Z","timestamp":1791873027000},"update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["Elastic Band Training Across Competitive Levels in Female Soccer: A Randomized Controlled Trial With Follow-up"],"prefix":"10.1177","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-7073-866X","authenticated-orcid":false,"given":"Henrique","family":"Sousa","sequence":"first","affiliation":[{"name":"Research Center in Sports Sciences, Health Sciences and Human Development, CIDESD, ELITE Research Community, Vila Real, Portugal"},{"name":"FPF Academy, Portuguese Football Federation, Oeiras, Portugal"},{"name":"University of Maia, Maia, Portugal"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4766-896X","authenticated-orcid":false,"given":"Eduardo","family":"Abade","sequence":"additional","affiliation":[{"name":"Research Center in Sports Sciences, Health Sciences and Human Development, CIDESD, ELITE Research Community, Vila Real, Portugal"},{"name":"FPF Academy, Portuguese Football Federation, Oeiras, Portugal"},{"name":"Department of Sports Science, Exercise and Health, University of Tr\u00e1s-os-Montes e Alto Douro, UTAD, Vila Real, Portugal"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8225-8667","authenticated-orcid":false,"given":"J\u00falio A.","family":"Costa","sequence":"additional","affiliation":[{"name":"FPF Academy, Portuguese Football Federation, Oeiras, Portugal"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2652-8685","authenticated-orcid":false,"given":"Jo\u00e3o","family":"Barreira","sequence":"additional","affiliation":[{"name":"Research Center in Sports Sciences, Health Sciences and Human Development, CIDESD, ELITE Research Community, Vila Real, Portugal"},{"name":"University of Maia, Maia, Portugal"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7611-8935","authenticated-orcid":false,"given":"Aar\u00f3n","family":"Miralles-Iborra","sequence":"additional","affiliation":[{"name":"Sports Research Centre (Department of Sport Sciences), Miguel Hernandez 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