{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,5,14]],"date-time":"2025-05-14T04:24:11Z","timestamp":1747196651504,"version":"3.40.5"},"reference-count":33,"publisher":"Public Library of Science (PLoS)","issue":"6","license":[{"start":{"date-parts":[[2024,6,26]],"date-time":"2024-06-26T00:00:00Z","timestamp":1719360000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["www.plosone.org"],"crossmark-restriction":false},"short-container-title":["PLoS ONE"],"abstract":"This study aims to establish the validity and reliability of the prone Yo-YoIRL1 in elite female rugby league players (part one) and determine the anthropometric and physical characteristics contributing to 15m prone Yo-YoIRL1 performance (part two). Part one, 21 subjects completed one Yo-YoIRL1, one 20m and two 15m prone Yo-YoIRL1 tests over four sessions, with 7\u201314 days in-between. Part two, ten subjects completed a testing battery, including body mass, height, dual-energy x-ray absorptiometry, isometric mid-thigh pull, isometric bench-press, 10m and 20m sprints and an incremental treadmill test (V<\/mml:mi>\u02d9<\/mml:mo><\/mml:mover>O<\/mml:mi>2<\/mml:mn>max<\/mml:mi><\/mml:mrow><\/mml:msub><\/mml:mrow><\/mml:math><\/jats:alternatives><\/jats:inline-formula>). The 15m prone YoYoIRL1 demonstrated poor reliability with a typical error of 68m (21%) and a smallest worthwhile change of 54m (9%). Validity analysis found the prone versions of the YoYoIRL1 were not sensitive measures of intermittent running performance. Both prone YoYoIRL1 test distances demonstrated large<\/jats:italic> mean bias (76% and -37% respectively) and typical error of the estimate (19% and 21%, respectively) in comparison to the YoYoIRL1. Body mass (r<\/jats:italic> = -0.89), lean mass (r<\/jats:italic> = -0.64), body fat % (r<\/jats:italic> = -0.68), V<\/mml:mi>\u02d9<\/mml:mo><\/mml:mover>O<\/mml:mi>2<\/mml:mn>max<\/mml:mi><\/mml:mrow><\/mml:msub><\/mml:mrow><\/mml:math><\/jats:alternatives><\/jats:inline-formula> (l\u2219min-1<\/jats:sup>) (r<\/jats:italic> = -0.64), IMTP (r<\/jats:italic> = -0.69), IBP (r<\/jats:italic> = -0.15), 10m (r<\/jats:italic> = -0.77) and 20m (r<\/jats:italic> = -0.72) momentum displayed large negative relationships with 15m prone Yo-YoIRL1 performance. Due to the poor validity of the 20m prone YoYoIRL1, the poor validity and reliability of the 15m prone YoYoIRL1, and the anthropometric and physical characteristics which negatively impact performance, practitioners should reconsider the use of the prone YoYoIRL1 test to monitor high intensity intermittent running performance.<\/jats:p>","DOI":"10.1371\/journal.pone.0306171","type":"journal-article","created":{"date-parts":[[2024,6,26]],"date-time":"2024-06-26T17:44:43Z","timestamp":1719423883000},"page":"e0306171","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":0,"title":["Validity, reliability, and the contributing physical characteristics of a modified 15m prone Yo-Yo Intermittent Recovery Test Level-1 test in elite female rugby league players"],"prefix":"10.1371","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0009-0004-3586-6020","authenticated-orcid":true,"given":"Thomas","family":"Briscoe","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Josh","family":"Darrall-Jones","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Omar","family":"Heyward","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ben","family":"Jones","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hayden","family":"Allen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Carlos","family":"Ramirez-Lopez","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sean","family":"Scantlebury","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"340","published-online":{"date-parts":[[2024,6,26]]},"reference":[{"key":"pone.0306171.ref001","doi-asserted-by":"crossref","first-page":"1087","DOI":"10.1007\/s40279-014-0190-x","article-title":"Applied sport science of rugby league","volume":"44","author":"RD Johnston","year":"2014","journal-title":"Sport Med"},{"key":"pone.0306171.ref002","doi-asserted-by":"crossref","first-page":"1333","DOI":"10.1519\/JSC.0000000000001225","article-title":"Physical qualities of international female rugby league players by playing position.","volume":"30","author":"B Jones","year":"2016","journal-title":"J Strength Cond Res"},{"key":"pone.0306171.ref003","doi-asserted-by":"crossref","first-page":"496","DOI":"10.1016\/j.jsams.2012.03.017","article-title":"Identifying risk factors for contact injury in professional rugby league players\u2014Application of a frailty model for recurrent injury.","volume":"15","author":"T Gabbett","year":"2012","journal-title":"J Sci Med Sport"},{"key":"pone.0306171.ref004","doi-asserted-by":"crossref","first-page":"209","DOI":"10.1016\/j.jsams.2014.01.009","article-title":"Influence of physical qualities on post-match fatigue in rugby league players.","volume":"18","author":"RD Johnston","year":"2015","journal-title":"J Sci Med Sport"},{"key":"pone.0306171.ref005","doi-asserted-by":"crossref","first-page":"334","DOI":"10.1136\/bjsm.36.5.334","article-title":"Physiological characteristics of junior and senior rugby league players.","volume":"36","author":"TJ Gabbett","year":"2002","journal-title":"Br J Sports Med"},{"key":"pone.0306171.ref006","doi-asserted-by":"crossref","first-page":"370","DOI":"10.1080\/02640414.2021.1993656","article-title":"International female rugby union players\u2019 anthropometric and physical performance characteristics: A five-year longitudinal analysis by individual positional groups.","volume":"40","author":"LN Woodhouse","year":"2022","journal-title":"J Sports Sci"},{"key":"pone.0306171.ref007","doi-asserted-by":"crossref","DOI":"10.3389\/fspor.2020.584194","article-title":"Physical Preparation in Female Rugby Codes: An Investigation of Current Practices.","volume":"2","author":"O Heyward","year":"2020","journal-title":"Front Sport Act Living."},{"key":"pone.0306171.ref008","first-page":"1","article-title":"Testing and Profiling Athletes: Recommendations for Test Selection, Implementation, and Maximizing Information.","volume":"00","author":"J Weakley","year":"2023","journal-title":"Strength Cond J."},{"key":"pone.0306171.ref009","doi-asserted-by":"crossref","first-page":"59","DOI":"10.26458\/1746","article-title":"Two Criteria for Good Measurements in Research: Validity and Reliability.","volume":"17","author":"H. Mohajan","year":"2017","journal-title":"Ann Spiru Haret Univ Econ Ser"},{"key":"pone.0306171.ref010","doi-asserted-by":"crossref","first-page":"176","DOI":"10.1519\/JSC.0000000000002621","article-title":"Concurrent Validity of a Rugby-Specific Yo-Yo Intermittent Recovery Test (Level 1) for Assessing Match-Related Running Performance.","volume":"35","author":"N Dobbin","year":"2018","journal-title":"J strength Cond Res."},{"key":"pone.0306171.ref011","doi-asserted-by":"crossref","first-page":"3232","DOI":"10.1519\/JSC.0000000000002280","article-title":"A Reliable Testing Battery for Assessing Physical Qualities of Elite Academy Rugby League Players.","volume":"32","author":"N Dobbin","year":"2017","journal-title":"J Strength Cond Res."},{"key":"pone.0306171.ref012","doi-asserted-by":"crossref","first-page":"2171","DOI":"10.1007\/s40279-017-0745-8","article-title":"Anthropometric and Physical Qualities of Elite Male Youth Rugby League Players.","volume":"47","author":"K Till","year":"2017","journal-title":"Sport Med."},{"key":"pone.0306171.ref013","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1371\/journal.pone.0249803","article-title":"The anthropometric and physical qualities of women\u2019s rugby league Super League and international players; identifying differences in playing position and level.","volume":"17","author":"S Scantlebury","year":"2022","journal-title":"PLoS One"},{"key":"pone.0306171.ref014","article-title":"Relationships of Final Velocity at 30\u201315 Intermittent Fitness Test and Anaerobic Speed Reserve with Body Composition, Sprinting, Change-of-Direction and Vertical Jumping Performances: A Cross-Sectional Study in Youth Soccer Players.","volume":"11","author":"A Silva","year":"2022","journal-title":"Biology (Basel)."},{"key":"pone.0306171.ref015","doi-asserted-by":"crossref","first-page":"321","DOI":"10.1123\/pes.2015-0212","article-title":"Reliability and Construct Validity of Yo-Yo Tests in Untrained and Soccer-Trained Schoolgirls Aged 9\u201316.","volume":"28","author":"SCA Povoas","year":"2016","journal-title":"Pediatr Exerc Sci."},{"key":"pone.0306171.ref016","doi-asserted-by":"crossref","first-page":"2050","DOI":"10.1519\/JSC.0000000000003741","article-title":"Profiling the Post-match Recovery Response in Male Rugby: A Systematic Review.","volume":"36","author":"H Aben","year":"2022","journal-title":"J strength Cond Res."},{"key":"pone.0306171.ref017","doi-asserted-by":"crossref","first-page":"697","DOI":"10.1249\/01.MSS.0000058441.94520.32","article-title":"The Yo-Yo intermittent recovery test: Physiological response, reliability, and validity.","volume":"35","author":"P Krustrup","year":"2003","journal-title":"Med Sci Sports Exerc"},{"key":"pone.0306171.ref018","article-title":"Influence of playing standard on upper- and lower-body strength, power, and velocity characteristics of elite rugby league players.","volume":"4","author":"JFT Fernandes","year":"2019","journal-title":"J Funct Morphol Kinesiol."},{"key":"pone.0306171.ref019","first-page":"741","article-title":"Force-Time curve characteristics of dynamic and isometric muscle actions of elite women olympic weightlifters.","volume":"19","author":"G Haff","year":"2005","journal-title":"J Strength Cond Res"},{"key":"pone.0306171.ref020","doi-asserted-by":"crossref","first-page":"3157","DOI":"10.1519\/JSC.0000000000002887","article-title":"Show me, Tell me, Encourage me: The Effect of Different Forms of Feedback on Resistance Training Performance.","volume":"34","author":"J Weakley","year":"2018","journal-title":"J Strength Cond Res"},{"key":"pone.0306171.ref021","doi-asserted-by":"crossref","first-page":"234","DOI":"10.1519\/JSC.0000000000004223","article-title":"Comparison of Sprint Timing Methods on Performance, and Displacement and Velocity at Timing Initiation.","volume":"37","author":"J Weakley","year":"2023","journal-title":"J Strength Cond Res."},{"key":"pone.0306171.ref022","first-page":"231","article-title":"Quantifying test-retest reliability using the intraclass correlation coefficient and the SEM.","volume":"19","author":"J. Weir","year":"2005","journal-title":"J Strength Cond Res"},{"key":"pone.0306171.ref023","article-title":"Reliability from consecutive pairs of trials (Excel spreadsheet).","author":"W. Hopkins","year":"2000","journal-title":"A new view of statistics."},{"key":"pone.0306171.ref024","article-title":"Spreadsheets for analysis of validity and reliability","volume":"21","author":"W. Hopkins","year":"2017","journal-title":"Sportscience"},{"key":"pone.0306171.ref025","doi-asserted-by":"crossref","first-page":"400","DOI":"10.1123\/ijspp.2015-0231","article-title":"The effect of body mass on the 30\u201315 intermittent fitness test in rugby union players.","volume":"11","author":"J Darrall-Jones","year":"2015","journal-title":"Int J Sports Physiol Perform"},{"key":"pone.0306171.ref026","first-page":"1","article-title":"Factors affecting the anthropometric and physical characteristics of elite academy rugby league players: a multi-club study.","volume":"7","author":"N Dobbin","year":"2018","journal-title":"Int J Sports Physiol Perform"},{"key":"pone.0306171.ref027","doi-asserted-by":"crossref","first-page":"738","DOI":"10.7205\/MILMED.172.7.738","article-title":"Correction factors for body mass bias in military physical fitness tests.","volume":"172","author":"PM Vanderburgh","year":"2007","journal-title":"Mil Med"},{"key":"pone.0306171.ref028","first-page":"67","article-title":"Scaling of 2-mile run times by body weight and fat-free weight in college-age men. J Strength Cond Res.","volume":"9","author":"PM Vanderburgh","year":"1995"},{"key":"pone.0306171.ref029","doi-asserted-by":"crossref","first-page":"753","DOI":"10.7205\/MILMED.171.8.753","article-title":"Body mass penalties in the physical fitness tests of the army, air force, and navy.","volume":"171","author":"PM Vanderburgh","year":"2006","journal-title":"Mil Med."},{"key":"pone.0306171.ref030","first-page":"541","article-title":"Adaptations in Upper\u2010Body Maximal Strength and Power Output Resulting From Long-Term Resistance Training in Experienced Strength-Power Athletes.","volume":"20","author":"D Baker","year":"2006","journal-title":"J Strength Cond."},{"key":"pone.0306171.ref031","doi-asserted-by":"crossref","first-page":"1","DOI":"10.17159\/2078-516X\/2021\/v33i1a9313","article-title":"Tackle injury epidemiology and performance in rugby league\u2014Narrative synthesis.","volume":"33","author":"N Burger","year":"2021","journal-title":"South African J Sport Med"},{"key":"pone.0306171.ref032","doi-asserted-by":"crossref","first-page":"365","DOI":"10.1519\/JSC.0b013e3181635b2e","article-title":"30\u201315 Intermittent Fitness Test: Accuracy For Individualizing Interval Training of Young intermittent Sport Players.","volume":"22","author":"M. 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