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Muscle shear modulus was assessed in 18 healthy males using shear wave elastography at rest and during 30\u00b0 isometric knee flexion at 20% of maximal voluntary isometric contraction, before and after a 10\u2009\u00d7\u200930\u00a0m repeated sprint protocol. There was a 9% decrease in average speed between the fastest and slowest sprint (p\u2009&lt;\u20090.001; <jats:italic>d<\/jats:italic>\u2009=\u20092.27). A pre-post decrease was observed in PT (p\u2009=\u20090.004; \u03b7<jats:sup>2<\/jats:sup><jats:sub>p<\/jats:sub>\u2009=\u20090.399) and in the 0\u201350\u00a0ms (p\u2009=\u20090.042; \u03b7<jats:sup>2<\/jats:sup><jats:sub>p<\/jats:sub>\u2009=\u20090.222), and 50\u2013100\u00a0ms (p\u2009=\u20090.028; \u03b7<jats:sup>2<\/jats:sup><jats:sub>p<\/jats:sub>\u2009=\u20090.254) RTD periods. For the active shear modulus, the only significant change after the sprint task was in the biceps femoris long head (BFlh) with an increase of 10% (Pre: 26.29\u2009\u00b1\u20098.89\u00a0kPa; Post: 28.93\u2009\u00b1\u20098.31\u00a0kPa; p\u2009=\u20090.015; <jats:italic>d<\/jats:italic>\u2009=\u20090.31). The present study provides evidence that repeated sprinting leads to significant decreases in average speed, PT, early RTD (0\u201350\u00a0ms; 50\u2013100\u00a0ms), and to an increase in BFlh active shear modulus without changing the shear modulus of the other hamstrings muscles.<\/jats:p>","DOI":"10.1038\/s41598-023-38861-9","type":"journal-article","created":{"date-parts":[[2023,8,3]],"date-time":"2023-08-03T14:01:50Z","timestamp":1691071310000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Effects of repeated sprinting on hamstring shear modulus pattern and knee flexor neuromuscular parameters"],"prefix":"10.1038","volume":"13","author":[{"given":"Ricardo","family":"Pimenta","sequence":"first","affiliation":[]},{"given":"Tom\u00e1s","family":"Lopes","sequence":"additional","affiliation":[]},{"given":"Jos\u00e9 Pedro","family":"Correia","sequence":"additional","affiliation":[]},{"given":"Ant\u00f3nio Prieto","family":"Veloso","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2023,8,3]]},"reference":[{"key":"38861_CR1","doi-asserted-by":"publisher","DOI":"10.1136\/bjsports-2021-105407","author":"J Ekstrand","year":"2022","unstructured":"Ekstrand, J. et al. 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