{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,15]],"date-time":"2026-04-15T20:33:17Z","timestamp":1776285197748,"version":"3.50.1"},"reference-count":82,"publisher":"Human Kinetics","issue":"1","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,1,1]]},"abstract":"\n \n Purpose<\/jats:bold>\n :\n <\/jats:italic>\n This study aimed to (1) evaluate the acute metabolic, mechanical, and perceptual responses to curve versus linear repeated-sprint-training (RST) protocols in highly trained youth soccer players and (2) analyze whether the sprint trajectory influences the time course of recovery following RST protocols.\n \n Methods<\/jats:bold>\n :\n <\/jats:italic>\n Twenty-seven highly trained youth soccer players randomly performed 2 RST protocols (12\u2009\u00d7\u200917\u00a0m with 15-s intervals) with different trajectories: linear or curve (radius of 9.15\u00a0m). Blood lactate concentration, countermovement-jump height, modified reactive strength index, and myotonometric measurements of the biceps femoris long head (stiffness, frequency, and decrement) were assessed before and 0 minutes, 5 minutes, and 24\u00a0hours after the protocols. Likewise, best and average sprint velocities were recorded in both protocols, and perceptual responses were evaluated using Borg and Hooper scales.\n \n Results<\/jats:bold>\n :\n <\/jats:italic>\n Linear RST showed higher velocity outputs than curve RST (\n P<\/jats:italic>\n \u2009<\u2009.001). No significant time\u2009\u00d7\u2009condition interactions were observed for blood lactate concentration, countermovement-jump height, modified reactive strength index, time to takeoff, or myotonometric measurements (all\n P<\/jats:italic>\n \u2009<\u2009.05), except for right-leg stiffness (\n P<\/jats:italic>\n \u2009=\u2009.047), which significantly increased from 0 minutes to 24\u00a0hours only after curve RST (\n P<\/jats:italic>\n \u2009<\u2009.05). Additionally, players also reported poorer sleep quality (\n P<\/jats:italic>\n \u2009=\u2009.045) following the curve RST.\n \n Conclusions<\/jats:bold>\n :\n <\/jats:italic>\n Overall, these findings suggest that the acute metabolic, mechanical, and perceptual demands of RST are not trajectory dependent. Therefore, strength and conditioning coaches can use both trajectories to address soccer-specific sprint demands in elite youth soccer players.\n <\/jats:p>","DOI":"10.1123\/ijspp.2024-0421","type":"journal-article","created":{"date-parts":[[2025,11,26]],"date-time":"2025-11-26T16:42:20Z","timestamp":1764175340000},"page":"128-136","source":"Crossref","is-referenced-by-count":1,"title":["Acute Metabolic, Mechanical, and Perceptual Responses to Curve Versus Linear Repeated-Sprint Training in Highly Trained Youth Soccer Players"],"prefix":"10.1123","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6590-6773","authenticated-orcid":true,"given":"Andr\u00e9s","family":"Baena-Raya","sequence":"first","affiliation":[{"name":"Department of Education, Faculty of Education Sciences, University of Almer\u00eda, Almer\u00eda, Spain"},{"name":"SPORT Research Group (CTS-1024), CIBIS (Centro de Investigaci\u00f3n para el Bienestar y la Inclusi\u00f3n Social) Research Center, University of Almer\u00eda, Almer\u00eda, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jos\u00e9 Mar\u00eda","family":"Ruiz-Zaragoza","sequence":"additional","affiliation":[{"name":"Uni\u00f3n Deportiva Almer\u00eda, Almer\u00eda, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6546-1487","authenticated-orcid":true,"given":"David M.","family":"D\u00edez-Fern\u00e1ndez","sequence":"additional","affiliation":[{"name":"Department of Education, Faculty of Education Sciences, University of Almer\u00eda, Almer\u00eda, Spain"},{"name":"SPORT Research Group (CTS-1024), CIBIS (Centro de Investigaci\u00f3n para el Bienestar y la Inclusi\u00f3n Social) Research Center, University of Almer\u00eda, Almer\u00eda, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4770-2694","authenticated-orcid":true,"given":"Ezequiel","family":"Rey","sequence":"additional","affiliation":[{"name":"Faculty of Education and Sport Sciences, University of Vigo, Pontevedra, Spain"},{"name":"Instituto de Investigaci\u00f3n en Ciencias del Deporte (CIDEGA), University of Vigo, Pontevedra, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8698-6303","authenticated-orcid":true,"given":"Marcos A.","family":"Soriano","sequence":"additional","affiliation":[{"name":"Center of Sport Studies, Rey Juan Carlos University, Madrid, Spain"},{"name":"University of Salford, Manchester, United Kingdom"},{"name":"Strength Training and Neuromuscular Performance (STreNgthP) Research Group, Camilo Jos\u00e9 Cela University, Madrid, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5535-2087","authenticated-orcid":true,"given":"Alejandro","family":"P\u00e9rez-Castilla","sequence":"additional","affiliation":[{"name":"Department of Education, Faculty of Education Sciences, University of Almer\u00eda, Almer\u00eda, Spain"},{"name":"SPORT Research Group (CTS-1024), CIBIS (Centro de Investigaci\u00f3n para el Bienestar y la Inclusi\u00f3n Social) Research Center, University of Almer\u00eda, Almer\u00eda, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1336-5979","authenticated-orcid":true,"given":"Manuel A.","family":"Rodr\u00edguez-P\u00e9rez","sequence":"additional","affiliation":[{"name":"Department of Education, Faculty of Education Sciences, University of Almer\u00eda, Almer\u00eda, Spain"},{"name":"SPORT Research Group (CTS-1024), CIBIS (Centro de Investigaci\u00f3n para el Bienestar y la Inclusi\u00f3n Social) Research Center, University of Almer\u00eda, Almer\u00eda, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1077-4259","authenticated-orcid":true,"given":"Alexis","family":"Padr\u00f3n-Cabo","sequence":"additional","affiliation":[{"name":"Faculty of Education and Sport Sciences, University of Vigo, Pontevedra, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"100","reference":[{"issue":"11\u201312","key":"r1","series-title":"J Sports Sci","doi-asserted-by":"publisher","first-page":"1320","DOI":"10.1080\/02640414.2019.1677391","article-title":"New curve sprint test for soccer players: reliability and relationship with linear sprint","volume":"38","author":"F\u00edlter A","year":"2020","unstructured":"F\u00edlter A, Olivares-Jabalera J, Santalla A, Nakamura FY, Loturco I, Requena B. 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