{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,27]],"date-time":"2026-09-27T07:12:49Z","timestamp":1790493169696,"version":"4.1.0"},"reference-count":41,"publisher":"Wiley","issue":"7","license":[{"start":{"date-parts":[[2021,4,11]],"date-time":"2021-04-11T00:00:00Z","timestamp":1618099200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Scandinavian Med Sci Sports"],"published-print":{"date-parts":[[2021,7]]},"abstract":"<jats:p>The compliant nature of distal limb muscle\u2010tendon units is traditionally considered suboptimal in explosive movements when positive joint work is required. However, during accelerative running, ankle joint net mechanical work is positive. Therefore, this study aims to investigate how plantar flexor muscle\u2010tendon behavior is modulated during fast accelerations. Eleven female sprinters performed maximum sprint accelerations from starting blocks, while gastrocnemius muscle fascicle lengths were estimated using ultrasonography. We combined motion analysis and ground reaction force measurements to assess lower limb joint kinematics and kinetics, and to estimate gastrocnemius muscle\u2010tendon unit length during the first two acceleration steps. Outcome variables were resampled to the stance phase and averaged across three to five trials. Relevant scalars were extracted and analyzed using one\u2010sample and two\u2010sample t\u2010tests, and vector trajectories were compared using statistical parametric mapping. We found that an uncoupling of muscle fascicle behavior from muscle\u2010tendon unit behavior is effectively used to produce net positive mechanical work at the joint during maximum sprint acceleration. Muscle fascicles shortened throughout the first and second steps, while shortening occurred earlier during the first step, where negative joint work was lower compared with the second step. Elastic strain energy may be stored during dorsiflexion after touchdown since fascicles did not lengthen at the same time to dissipate energy. Thus, net positive work generation is accommodated by the reuse of elastic strain energy along with positive gastrocnemius fascicle work. Our results show a mechanism of how muscles with high in\u2010series compliance can contribute to net positive joint work.<\/jats:p>","DOI":"10.1111\/sms.13956","type":"journal-article","created":{"date-parts":[[2021,3,22]],"date-time":"2021-03-22T10:20:55Z","timestamp":1616408455000},"page":"1471-1480","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["Medial gastrocnemius muscle fascicles shorten throughout stance during sprint acceleration"],"prefix":"10.1111","volume":"31","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3194-2282","authenticated-orcid":false,"given":"Amelie","family":"Werkhausen","sequence":"first","affiliation":[{"name":"Institute for Biomechanics and Orthopaedics German Sport University Cologne Cologne Germany"},{"name":"Department of Physical Performance Norwegian School of Sport Sciences Oslo 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