{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,2]],"date-time":"2026-04-02T00:53:59Z","timestamp":1775091239013,"version":"3.50.1"},"reference-count":60,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2022,1,17]],"date-time":"2022-01-17T00:00:00Z","timestamp":1642377600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Funda\u00e7\u00e3o para a Ci\u00eancia e Tecnologia\/ Minist\u00e9rio da Ci\u00eancia, Tecnologia e Ensino Superior","award":["UIDB\/50008\/2020"],"award-info":[{"award-number":["UIDB\/50008\/2020"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJERPH"],"abstract":"<jats:p>The purpose of this study was two-fold: (i) analyze the variations of locomotor profile, sprinting, change-of-direction (COD) and jumping performances between different youth age-groups; and (ii) test the interaction effect of athletic performance with playing positions. A cross-sectional study design was followed. A total of 124 youth soccer players from five age-groups were analyzed once in a time. Players were classified based on their typical playing position. The following measures were obtained: (i) body composition (fat mass); (ii) jump height (measured in the countermovement jump; CMJ); (iii) sprinting time at 5-, 10-, 15-, 20-, 25- and 30-m; (iv) maximal sprint speed (measured in the best split time; MSS); (v) COD asymmetry index percentage); (vi) final velocity at 30-15 Intermittent Fitness Test (VIFT); and (vii) anaerobic speed reserve (ASR = MSS \u2212 VIFT). A two-way ANOVA was used for establishing the interactions between age-groups and playing positions. Significant differences were found between age-groups in CMJ (p &lt; 0.001), 5-m (p &lt; 0.001), 10-m (p &lt; 0.001), 15-m (p &lt; 0.001), 20-m (p &lt; 0.001), 25-m (p &lt; 0.001), 30-m (p &lt; 0.001), VIFT (p &lt; 0.001), ASR (p = 0.003), MSS (p &lt; 0.001), COD (p &lt; 0.001). Regarding variations between playing positions no significant differences were found. In conclusion, it was found that the main factor influencing changes in physical fitness was the age group while playing positions had no influence on the variations in the assessed parameters. In particular, as older the age group, as better was in jumping, sprinting, COD, and locomotor profile.<\/jats:p>","DOI":"10.3390\/ijerph19020998","type":"journal-article","created":{"date-parts":[[2022,1,17]],"date-time":"2022-01-17T08:20:42Z","timestamp":1642407642000},"page":"998","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Variations of the Locomotor Profile, Sprinting, Change-of-Direction, and Jumping Performances in Youth Soccer Players: Interactions between Playing Positions and Age-Groups"],"prefix":"10.3390","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1772-1272","authenticated-orcid":false,"given":"Ana Filipa","family":"Silva","sequence":"first","affiliation":[{"name":"Escola Superior Desporto e Lazer, Instituto Polit\u00e9cnico de Viana do Castelo, Rua Escola Industrial e Comercial de Nun\u2019\u00c1lvares, 4900-347 Viana do Castelo, Portugal"},{"name":"The Research Centre in Sports Sciences, Health Sciences and Human Development (CIDESD), 5001-801 Vila Real, Portugal"},{"name":"Research Center in Sports Performance, Recreation, Innovation and Technology (SPRINT), 4960-320 Melga\u00e7o, Portugal"}]},{"given":"S\u00fcmer","family":"Alvurdu","sequence":"additional","affiliation":[{"name":"Faculty of Sport Sciences, Gazi University, Ankara 06500, Turkey"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1743-5989","authenticated-orcid":false,"given":"Zeki","family":"Akyildiz","sequence":"additional","affiliation":[{"name":"Faculty of Sport Sciences, Gazi University, Ankara 06500, Turkey"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4100-8765","authenticated-orcid":false,"given":"Georgian","family":"Badicu","sequence":"additional","affiliation":[{"name":"Department of Physical Education and Special Motricity, Faculty of Physical Education and Mountain Sports, Transilvania University of Bra\u015fov, 500068 Bra\u015fov, Romania"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5023-3721","authenticated-orcid":false,"given":"Gianpiero","family":"Greco","sequence":"additional","affiliation":[{"name":"Department of Basic Medical Sciences, Neuroscience and Sense Organs, University of Study of Bari, 70121 Bari, Italy"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9813-2842","authenticated-orcid":false,"given":"Filipe Manuel","family":"Clemente","sequence":"additional","affiliation":[{"name":"Escola Superior Desporto e Lazer, Instituto Polit\u00e9cnico de Viana do Castelo, Rua Escola Industrial e Comercial de Nun\u2019\u00c1lvares, 4900-347 Viana do Castelo, Portugal"},{"name":"The Research Centre in Sports Sciences, Health Sciences and Human Development (CIDESD), 5001-801 Vila Real, Portugal"},{"name":"Instituto de Telecomunica\u00e7\u00f5es, Delega\u00e7\u00e3o da Covilh\u00e3, 1049-001 Lisboa, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2022,1,17]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"783","DOI":"10.2165\/00007256-200737090-00003","article-title":"Future Perspectives in the Evaluation of the Physiological Demands of Soccer","volume":"37","author":"Drust","year":"2007","journal-title":"Sport Med."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"593","DOI":"10.1080\/02640410400021286","article-title":"Fatigue in soccer: A brief review","volume":"23","author":"Mohr","year":"2005","journal-title":"J. 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