{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,7]],"date-time":"2026-07-07T04:37:34Z","timestamp":1783399054916,"version":"3.54.6"},"reference-count":81,"publisher":"The Company of Biologists","issue":"2","license":[{"start":{"date-parts":[[2026,1,30]],"date-time":"2026-01-30T00:00:00Z","timestamp":1769731200000},"content-version":"vor","delay-in-days":15,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0"}],"funder":[{"DOI":"10.13039\/501100003130","name":"Fonds Wetenschappelijk Onderzoek","doi-asserted-by":"crossref","award":["G014823N"],"award-info":[{"award-number":["G014823N"]}],"id":[{"id":"10.13039\/501100003130","id-type":"DOI","asserted-by":"crossref"}]},{"DOI":"10.13039\/501100007660","name":"Universiteit Antwerpen","doi-asserted-by":"crossref","award":["SEP BOF FFB190380"],"award-info":[{"award-number":["SEP BOF FFB190380"]}],"id":[{"id":"10.13039\/501100007660","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,1,15]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>Rapid cyclic movements are generated by antagonistic muscle pairs contracting in an alternating pattern. The highest frequencies can be generated in balanced torque-producing systems with specialized muscle fibers. The system's frequency output is expected to change when it becomes more adapted to functions with conflicting mechanical demand, such as increased static torque production in one direction. This study first conceptualized how distinct factors (fiber type, muscle cross-sectional area, moment arm and inertial properties) could influence this torque\u2013frequency trade-off. Special attention is given to Henneman's principle, as many of these systems contain both slow- and fast-twitch muscle fiber, typically organized in motor units, with the smallest, slow-twitch, fiber-rich motor units being recruited first. Next, we used Hill-type muscle models operating a Java sparrow's mandible as a case study for this framework. Our model showed that muscle fiber type strongly affects the frequency output, with a notable role for Henneman's effect causing the overdeveloped muscle to predominantly recruit slow-twitch muscle fibers. This leads to large muscle torque output overlap, which in turn reduces frequency. Once torque imbalance occurs, altering the other variables only slightly changes the frequency, suggesting a dominant role of muscle contractile properties. This means that the conflicting demands of multifunctional musculoskeletal lever systems such as bird beaks are also tightly linked to fiber type and motor unit roles such as endurance and precision of movement.<\/jats:p>","DOI":"10.1242\/jeb.250733","type":"journal-article","created":{"date-parts":[[2026,1,30]],"date-time":"2026-01-30T09:42:56Z","timestamp":1769766176000},"source":"Crossref","is-referenced-by-count":3,"title":["A modelling perspective on torque\u2013frequency trade-offs in multifunctional lever systems driven by antagonist muscle pairs"],"prefix":"10.1242","volume":"229","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7972-5044","authenticated-orcid":false,"given":"Cas","family":"Jorissen","sequence":"first","affiliation":[{"name":"University of Antwerp 1 Laboratory of Functional Morphology , , Antwerpen 2610 ,","place":["Belgium"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sam","family":"van Wassenbergh","sequence":"additional","affiliation":[{"name":"University of Antwerp 1 Laboratory of Functional Morphology , , Antwerpen 2610 ,","place":["Belgium"]},{"name":"University of Ghent 2 Laboratory of Evolutionary Morphology of Vertebrates , , Ghent 9000 ,","place":["Belgium"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"237","published-online":{"date-parts":[[2026,1,30]]},"reference":[{"key":"2026013004425300800_JEB250733C1","doi-asserted-by":"publisher","first-page":"1607","DOI":"10.1098\/rstb.1998.0313","article-title":"Vertical jumping in Galago senegalensis: the quest for an obligate mechanical power amplifier","volume":"353","author":"Aerts","year":"1998","journal-title":"Philos. 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