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The contralateral repeated bout effect (CL-RBE) may be relevant for muscle\u2013tendon units with comparatively small fascicle strains during eccentric tasks, such as the triceps surae, but has not been established in this muscle group. We tested whether unilateral eccentric heel drops produced evidence consistent with the CL-RBE in the triceps surae and whether its expression differed after 2- and 7-day interbout intervals.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Twenty-four participants completed 225 unilateral eccentric heel drops (ECC1), then repeated the task on the opposite limb (ECC2) after 2\u00a0days (2D, n=12) or 7\u00a0days (7D, n=12). Maximal voluntary isometric plantar-flexor torque (MVIC) and soreness were assessed at baseline (PRE) and post-exercise. Surface electromyography (sEMG) amplitude (root mean square, RMS) and median frequency (MDF) were quantified during each bout.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>At 48\u00a0h, normalised MVIC torque was higher after ECC2 than ECC1 in 2D (10.8%PRE, 95% CI 3.0\u201318.5%PRE) and 7D (12.6%PRE, 95% CI 4.6\u201320.6%PRE), with no evidence that the ECC2\u2013ECC1 torque response differed between intervals. Soreness was lower after ECC2 only in 2D (\u2212\u20093.83\/60, 95% CI \u22126.62 to \u22121.05). sEMG RMS and MDF showed no muscle-specific or interval-dependent bout effects.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Unilateral eccentric heel drops produced evidence consistent with the CL-RBE in the triceps surae, expressed as reduced contralateral strength loss across 2- and 7-day intervals. Soreness attenuation was less consistent, while sEMG indices remained unchanged.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s00421-026-06421-4","type":"journal-article","created":{"date-parts":[[2026,9,8]],"date-time":"2026-09-08T10:37:18Z","timestamp":1788863838000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Contralateral repeated bout effect in the triceps surae after unilateral heel drop exercise at 2- and 7-day interbout intervals"],"prefix":"10.1007","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6745-2568","authenticated-orcid":false,"given":"Nicole S.","family":"Jones","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2653-169X","authenticated-orcid":false,"given":"Dean E.","family":"Mills","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8528-1515","authenticated-orcid":false,"given":"Patricio A.","family":"Pincheira","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8408-6192","authenticated-orcid":false,"given":"Ben W.","family":"Hoffman","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,9,8]]},"reference":[{"key":"6421_CR1","doi-asserted-by":"publisher","unstructured":"Bates D, M\u00e4chler M, Bolker B, Walker S (2015) Fitting linear mixed-effects models using lme4. 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The results of this study are presented clearly and honestly, without fabrication, falsification, or inappropriate data manipulation.","order":1,"name":"Ethics","label":"Conflict of interests","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"This study was approved by the Human Research Ethics Committee of the University of Southern Queensland (Approval Number: H22REA079). All protocols complied with the Declaration of Helsinki (World Medical Association\n                      \n                      ) and the National Statement on Ethical Conduct in Human Research (National Health and Medical Research Council 2023) regarding the use of human participants. The study was not prospectively registered in a publicly accessible database, as it used a repeated-measures experimental design in healthy participants and was not a clinical trial.","order":2,"name":"Ethics","label":"Ethics approval","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"Informed consent was obtained from all individual participants included in the study.","order":3,"name":"Ethics","label":"Consent to participate","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"Informed consent for the publication of anonymised data was obtained from all participants included in the study.","order":4,"name":"Ethics","label":"Consent for publication","group":{"name":"EthicsHeading","label":"Declarations"}}]}}