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Importance of Reactive Agility and Change of Direction Speed in Differentiating Performance Levels in Junior Soccer Players: Reliability and Validity of Newly Developed Soccer-Specific Tests
Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences. (The Swedish Winter Sports Research Centre)ORCID iD: 0000-0002-9554-1234
Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences.
Faculty of Kinesiology, University of Split, Split, Croatia.
Faculty of Kinesiology, University of Zagreb, Zagreb, Croatia.
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2018 (English)In: Frontiers in Physiology, ISSN 1664-042X, E-ISSN 1664-042X, Vol. 9, no MAY, article id 506Article in journal (Refereed) Published
Abstract [en]

Agility is a significant determinant of success in soccer; however, studies have rarely presented and evaluated soccer-specific tests of reactive agility (S_RAG) and non-reactive agility (change of direction speed – S_CODS) or their applicability in this sport. The aim of this study was to define the reliability and validity of newly developed tests of the S_RAG and S_CODS to discriminate between the performance levels of junior soccer players. The study consisted of 20 players who were involved at the highest national competitive rank (all males; age: 17.0 0.9 years), divided into three playing positions (defenders, midfielders, and forwards) and two performance levels(U17 and U19). Variables included body mass (BM), body height, body fat percentage,20-m sprint, squat jump, countermovement jump, reactive-strength-index, unilateral jump, 1RM-back-squat, S_CODS, and three protocols of S_RAG. The reliabilities of theS_RAG and S_CODS were appropriate to high (ICC: 0.70 to 0.92), with the strongest reliability evidenced for the S_CODS. The S_CODS and S_RAG shared 25–40% of the common variance. Playing positions significantly differed in BM (large effect-size differences [ES]; midfielders were lightest) and 1RM-back-squat (large ES; lowest results in midfielders). The performance levels significantly differed in age and experience in soccer; U19 achieved better results in the S_CODS (t-test: 3.61, p < 0.05, large ES)and two S_RAG protocols (t-test: 2.14 and 2.41, p < 0.05, moderate ES). Newly developed tests of soccer-specific agility are applicable to differentiate U17 and U19players. Coaches who work with young soccer athletes should be informed that the development of soccer-specific CODS and RAG in this age is mostly dependent on training of the specific motor proficiency.

Place, publisher, year, edition, pages
Frontiers Media S.A., 2018. Vol. 9, no MAY, article id 506
Keywords [en]
football, pre-planned agility, non-planned agility, conditioning capacities, team sports
National Category
Sport and Fitness Sciences
Identifiers
URN: urn:nbn:se:miun:diva-33619DOI: 10.3389/fphys.2018.00506ISI: 000432407300001PubMedID: 29867552Scopus ID: 2-s2.0-85047011594OAI: oai:DiVA.org:miun-33619DiVA, id: diva2:1205679
Available from: 2018-05-15 Created: 2018-05-15 Last updated: 2018-07-04Bibliographically approved

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Publisher's full textPubMedScopushttp://journal.frontiersin.org/article/10.3389/fphys.2018.00506/full?&utm_source=Email_to_authors_&utm_medium=Email&utm_content=T1_11.5e1_author&utm_campaign=Email_publication&field=&journalName=Frontiers_in_Physiology&id=368621

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Pojskic, HarisErik, Åslin

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