{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,6]],"date-time":"2026-03-06T03:56:12Z","timestamp":1772769372366,"version":"3.50.1"},"reference-count":35,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"12","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2019,12]]},"abstract":"<jats:title>Abstract<\/jats:title>\n          <jats:p>Castagna, C, Krustrup, P, D'Ottavio, S, Pollastro, C, Bernardini, A, and Ara\u00fajo P\u00f3voas, SC. Ecological validity and reliability of an age-adapted endurance field test in young male soccer players. <jats:italic toggle=\"yes\">J Strength Cond Res<\/jats:italic> 33(12): 3400\u20133405, 2019\u2014The purpose of this study was to examine the reliability and the association with relevant match activities (ecological validity) of an age-adapted field test for intermittent high-intensity endurance known as Yo-Yo intermittent recovery level 1 children's test (YYIR1C) in young male soccer players. Twenty-eight young male outfield soccer players (age 11.1 \u00b1 0.9 years, height 142 \u00b1 4.4 cm, body mass 37.0 \u00b1 5.9 kg) with at least 2 years of experience in soccer competitions were tested twice using YYIR1C and an age-adapted competitive small-sided game (i.e., 9v9), 7 days apart in a random order. The YYIR1C performance showed an excellent relative (intraclass correlation coefficient = 0.94) and a good absolute reliability (typical error of measurement as percentage of the coefficient of variation = 5.1%). Very large and significant associations were found between YYIR1C performance and match high-intensity activity (<jats:italic toggle=\"yes\">r<\/jats:italic>\n                           <jats:sup>2<\/jats:sup> = 0.53). Large correlations were found between YYIR1C and match sprinting (<jats:italic toggle=\"yes\">r<\/jats:italic>\n                           <jats:sup>2<\/jats:sup> = 0.42) and high-intensity metabolic power (<jats:italic toggle=\"yes\">r<\/jats:italic>\n                           <jats:sup>2<\/jats:sup> = 0.46) distances. Match total distance was largely associated with YYIR1C (<jats:italic toggle=\"yes\">r<\/jats:italic>\n                           <jats:sup>2<\/jats:sup> = 0.30). The results of this study showed that YYIR1C may be considered a valid and reliable field test for assessing intermittent high-intensity endurance in young male soccer players. Because of the relevance of aerobic fitness in youth soccer, future studies testing the sensitiveness of YYIR1C are necessary.<\/jats:p>","DOI":"10.1519\/jsc.0000000000002255","type":"journal-article","created":{"date-parts":[[2018,1,12]],"date-time":"2018-01-12T18:52:29Z","timestamp":1515783149000},"page":"3400-3405","source":"Crossref","is-referenced-by-count":12,"title":["Ecological Validity and Reliability of an Age-Adapted Endurance Field Test in Young Male Soccer Players"],"prefix":"10.1519","volume":"33","author":[{"given":"Carlo","family":"Castagna","sequence":"first","affiliation":[{"name":"Fitness Training and Biomechanics Laboratory, Italian Football Federation (FIGC), Technical Department, Coverciano, Florence, Italy;"},{"name":"Faculty of Medicine and Surgery, School of Sports and Exercise Sciences, University of Rome \u201cTor Vergata,\u201d Rome, Italy;"}]},{"given":"Peter","family":"Krustrup","sequence":"additional","affiliation":[{"name":"Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark;"}]},{"given":"Stefano","family":"D'Ottavio","sequence":"additional","affiliation":[{"name":"Faculty of Medicine and Surgery, School of Sports and Exercise Sciences, University of Rome \u201cTor Vergata,\u201d Rome, Italy;"},{"name":"Women's National Team, Italian Football Federation (FIGC), Rome, Italy;"}]},{"given":"Carlo","family":"Pollastro","sequence":"additional","affiliation":[{"name":"University of Pisa, Pisa, Italy; and"}]},{"given":"Andrea","family":"Bernardini","sequence":"additional","affiliation":[{"name":"Faculty of Medicine and Surgery, School of Sports and Exercise Sciences, University of Rome \u201cTor Vergata,\u201d Rome, Italy;"}]},{"given":"Susana C.","family":"Ara\u00fajo P\u00f3voas","sequence":"additional","affiliation":[{"name":"Research Center in Sports Sciences, Health Sciences and Human Development, CIDESD, ISMAI, University Institute of Maia, Maia, 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