{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,18]],"date-time":"2026-03-18T19:08:11Z","timestamp":1773860891665,"version":"3.50.1"},"reference-count":41,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2024,1,4]],"date-time":"2024-01-04T00:00:00Z","timestamp":1704326400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001871","name":"Funda\u00e7\u00e3o para a Ci\u00eancia e a Tecnologia","doi-asserted-by":"publisher","award":["UID\/DTP\/UI447\/2019"],"award-info":[{"award-number":["UID\/DTP\/UI447\/2019"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100005765","name":"Universidade de Lisboa","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100005765","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Physiol."],"abstract":"<jats:p><jats:bold>Purpose:<\/jats:bold> This study compares the average speed, knee flexor peak torque and shear modulus of the hamstrings after a repeated sprint task, in football players of different competitive levels and playing positions.<\/jats:p><jats:p><jats:bold>Methods:<\/jats:bold> Fifty-four football field players without hamstring strain injury history participated, 15 being categorized as professional (2nd league) and 39 as semi-professional (17 in 3rd and 22 in 4th league). Muscle shear modulus was assessed using ultrasound-based shear wave elastography at rest and at 20% of maximal voluntary isometric effort before and immediately after the repeated sprint protocol.<\/jats:p><jats:p><jats:bold>Results:<\/jats:bold> No significant differences were seen in average sprint speed between competitive levels (<jats:italic>p<\/jats:italic> = 0.07; \u03b72<jats:italic>p<\/jats:italic> = 0.28) and positions (<jats:italic>p<\/jats:italic> = 0.052; \u03b72<jats:italic>p<\/jats:italic> = 0.29). Moreover, the sprint fatigue index showed no significant differences between competitive levels (<jats:italic>p<\/jats:italic> = 0.14; \u03b72<jats:italic>p<\/jats:italic> = 0.08) and playing positions (<jats:italic>p<\/jats:italic> = 0.89; \u03b72<jats:italic>p<\/jats:italic> = 0.05). No significant differences were observed in hamstring shear modulus changes between competitive levels (<jats:italic>p<\/jats:italic> = 0.94; \u03b72<jats:italic>p<\/jats:italic> = 0.03) and positions (<jats:italic>p<\/jats:italic> = 0.92; \u03b72<jats:italic>p<\/jats:italic> = 0.03). Peak torque changes also showed non-significant association with competitive levels (<jats:italic>p<\/jats:italic> = 0.46; \u03b72<jats:italic>p<\/jats:italic> = 0.03) and positions (<jats:italic>p<\/jats:italic> = 0.60; \u03b72<jats:italic>p<\/jats:italic> = 0.02).<\/jats:p><jats:p><jats:bold>Conclusion:<\/jats:bold> The results of this study suggest that the average sprint speed performance parameter and mechanical parameters are not able to distinguish football players of different competitive levels and positions.<\/jats:p>","DOI":"10.3389\/fphys.2023.1315564","type":"journal-article","created":{"date-parts":[[2024,1,4]],"date-time":"2024-01-04T05:02:21Z","timestamp":1704344541000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":2,"title":["Hamstrings mechanical properties profiling in football players of different competitive levels and positions after a repeated sprint protocol"],"prefix":"10.3389","volume":"14","author":[{"given":"Ricardo","family":"Pimenta","sequence":"first","affiliation":[]},{"given":"Hugo","family":"Antunes","sequence":"additional","affiliation":[]},{"given":"Paula","family":"Bruno","sequence":"additional","affiliation":[]},{"given":"A. 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