{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,2]],"date-time":"2026-08-02T23:44:38Z","timestamp":1785714278985,"version":"3.56.0"},"reference-count":17,"publisher":"Springer Science and Business Media LLC","issue":"1","license":[{"start":{"date-parts":[[2026,5,28]],"date-time":"2026-05-28T00:00:00Z","timestamp":1779926400000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"},{"start":{"date-parts":[[2026,8,3]],"date-time":"2026-08-03T00:00:00Z","timestamp":1785715200000},"content-version":"vor","delay-in-days":67,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"funder":[{"name":"Scientific Research Projects Coordination Unit of Istanbul Beykent University","award":["Project No: 2024-25-BAP-10"],"award-info":[{"award-number":["Project No: 2024-25-BAP-10"]}]}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["BMC Sports Sci Med Rehabil"],"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Objective<\/jats:title>\n                    <jats:p>To investigate the acute and short-term (24\u00a0h) effects of localized plantar flexion fatigue on muscle mechanical properties, countermovement jump (CMJ) kinetics, and dynamic balance, focusing on recovery profiles of the gastrocnemius medialis (MG) and lateralis (LG).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Design<\/jats:title>\n                    <jats:p>Prospective, repeated-measures experimental study.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      Twenty-eight healthy volunteers (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u200928) performed a standardized unilateral isometric plantar flexion fatigue protocol until task failure (Borg CR-10\u2009\u2265\u20098). Assessments were conducted at baseline, immediately post-fatigue, and 24\u00a0h post-fatigue (24\u00a0h). Outcomes included myotonometric properties (tone, stiffness, elasticity, relaxation time, and creep) of the MG and LG via MyotonPRO, CMJ kinetics via force plate, and dynamic balance via the Modified Star Excursion Balance Test (mSEBT).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Significant Time \u00d7 Region interactions were found for stiffness (\n                      <jats:italic>P<\/jats:italic>\n                      = 0.038, \u03b7p\u00b2 = 0.276) and relaxation time (\n                      <jats:italic>P<\/jats:italic>\n                      = 0.024, \u03b7p\u00b2 = 0.171). Both muscle heads showed an acute decrease in stiffness (\n                      <jats:italic>P<\/jats:italic>\n                      &lt; 0.001); however, LG stiffness recovered by 24\u00a0h (\n                      <jats:italic>P<\/jats:italic>\n                      = 0.330), while MG stiffness remained reduced (\n                      <jats:italic>P<\/jats:italic>\n                      &lt; 0.05). Although CMJ height recovered at 24\u00a0h (\n                      <jats:italic>P<\/jats:italic>\n                      = 0.842), eccentric and braking phase durations remained prolonged (\n                      <jats:italic>P<\/jats:italic>\n                      &lt; 0.001; \u03b7p\u00b2 = 0.357 and \u03b7p\u00b2 = 0.264), indicating altered neuromuscular strategies. For dynamic balance, a delayed impairment was observed in anterior reach distance, which declined only at 24\u00a0h compared to baseline (\n                      <jats:italic>P<\/jats:italic>\n                      = 0.021, \u03b7p\u00b2 = 0.133).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Localized plantar flexion fatigue induces region-specific mechanical alterations and asynchronous recovery. Restoration of jump height at 24\u00a0h masks persistent deficits in eccentric phase durations and MG stiffness. These findings highlight a \u201cneuromuscular vulnerability window\u201d at 24\u00a0h post-fatigue, where delayed impairments in MG mechanics and anterior stability may increase potential susceptibility to injury despite apparent recovery. Practically, monitoring head-specific muscle mechanics, rather than global performance outcomes, is critical during this 24\u00a0h window to optimize training modification and guide objective return-to-play decisions.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Trial registration<\/jats:title>\n                    <jats:p>NCT07457398 (Registration date: February 25, 2026).<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/s13102-026-01774-x","type":"journal-article","created":{"date-parts":[[2026,5,28]],"date-time":"2026-05-28T07:25:24Z","timestamp":1779953124000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Asynchronous recovery of medial and lateral gastrocnemius mechanical properties and jump performance following localized plantar flexor fatigue"],"prefix":"10.1186","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3711-8761","authenticated-orcid":false,"given":"Yasemin","family":"\u015eahbaz","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ali","family":"\u0130lez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nergiz","family":"Batur","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,5,28]]},"reference":[{"key":"1774_CR1","doi-asserted-by":"publisher","first-page":"1504","DOI":"10.3389\/fphys.2019.01504","volume":"10","author":"J Aeles","year":"2019","unstructured":"Aeles J, Vanwanseele B. 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All participants were informed about the study procedures, and written informed consent was obtained from each participant prior to their inclusion in the study.","order":1,"name":"Ethics","label":"Ethics approval and consent to participate","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"Not applicable.","order":2,"name":"Ethics","label":"Consent for publication","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"The authors declare no competing interests.","order":3,"name":"Ethics","label":"Competing interests","group":{"name":"EthicsHeading","label":"Declarations"}}],"article-number":"341"}}