{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,28]],"date-time":"2026-10-28T19:11:03Z","timestamp":1793214663131,"version":"4.5.0"},"reference-count":34,"publisher":"Public Library of Science (PLoS)","issue":"6","license":[{"start":{"date-parts":[[2022,6,24]],"date-time":"2022-06-24T00:00:00Z","timestamp":1656028800000},"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":"<jats:p>\n                    The presence of inter-limb asymmetries can influence strength performance and represent an injury risk factor for team sport athletes. The present study aimed to investigate the effects of changes in resistance loads using different assessment modalities on the magnitude and the direction of inter-limb asymmetry within the same leg. Fifteen young elite soccer players from the same professional academy performed rear-foot-elevated-split-squat-test at different loading conditions (body mass with no overload, 25% of body mass, 50% of body mass 50%), isokinetic knee flexor (concentric 30\u00b0\u00b7s\n                    <jats:sup>-1<\/jats:sup>\n                    , concentric 60\u00b0\u00b7s\n                    <jats:sup>-1<\/jats:sup>\n                    , eccentric 90\u00b0\u00b7s\n                    <jats:sup>-1<\/jats:sup>\n                    ) and extensor (concentric 60\u00b0\u00b7s\n                    <jats:sup>-1<\/jats:sup>\n                    , eccentric 60\u00b0\u00b7s\n                    <jats:sup>-1<\/jats:sup>\n                    ). The outcomes from the agreement analyses suggested moderate level agreement between body mass vs body mass 25% (Kappa = 0.46), with no agreement or fair agreement for the other between-assessment comparison. Our results demonstrated that the magnitude and direction of within-limb strength imbalances were inconsistent when compared within the same assessment under different resistance load conditions.\n                  <\/jats:p>","DOI":"10.1371\/journal.pone.0269695","type":"journal-article","created":{"date-parts":[[2022,6,24]],"date-time":"2022-06-24T13:44:36Z","timestamp":1656078276000},"page":"e0269695","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":19,"title":["Inter-limb asymmetry in youth elite soccer players: Effect of loading conditions"],"prefix":"10.1371","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4608-0301","authenticated-orcid":true,"given":"Giampiero","family":"Ascenzi","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cristoforo","family":"Filetti","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Valter","family":"Di Salvo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"F. Javier","family":"Nu\u00f1ez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luis","family":"Suarez-Arrones","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bruno","family":"Ruscello","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fabio Massimo","family":"Francioni","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alberto Mendez","family":"Villanueva","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"340","published-online":{"date-parts":[[2022,6,24]]},"reference":[{"issue":"6","key":"pone.0269695.ref001","doi-asserted-by":"crossref","first-page":"501","DOI":"10.2165\/00007256-200535060-00004","article-title":"Physiology of soccer: an update.","volume":"35","author":"T St\u00f8len","year":"2005","journal-title":"Sports Med Auckl NZ"},{"key":"pone.0269695.ref002","first-page":"59","article-title":"Motion analysis and physiological demands","volume":"2","author":"T. Reilly","year":"2003","journal-title":"Science and soccer"},{"key":"pone.0269695.ref003","doi-asserted-by":"crossref","first-page":"265","DOI":"10.3389\/fphys.2018.00265","article-title":"Specific Changes in Young Soccer Player\u2019s Fitness After Traditional Bilateral vs. Unilateral Combined Strength and Plyometric Training.","volume":"9","author":"R Ramirez-Campillo","year":"2018","journal-title":"Front Physiol"},{"issue":"7","key":"pone.0269695.ref004","doi-asserted-by":"crossref","first-page":"1379","DOI":"10.1249\/MSS.0000000000000897","article-title":"Musculoskeletal Asymmetry in Football Athletes: A Product of Limb Function over Time.","volume":"48","author":"NH Hart","year":"2016","journal-title":"Med Sci Sports Exerc"},{"issue":"3","key":"pone.0269695.ref005","first-page":"364","article-title":"Lower limb strength in professional soccer players: profile, asymmetry, and training age.","volume":"9","author":"K Fousekis","year":"2010","journal-title":"J Sports Sci Med"},{"issue":"9","key":"pone.0269695.ref006","doi-asserted-by":"crossref","first-page":"2579","DOI":"10.1519\/JSC.0000000000002608","article-title":"The Relationship Between Asymmetry and Athletic Performance: A Critical Review","volume":"33","author":"SJ Maloney","year":"2019","journal-title":"J Strength Cond Res"},{"issue":"3","key":"pone.0269695.ref007","doi-asserted-by":"crossref","first-page":"769","DOI":"10.1519\/JSC.0000000000002749","article-title":"Quadriceps Strength and Functional Performance After Anterior Cruciate Ligament Reconstruction in Professional Soccer players at Time of Return to Sport.","volume":"35","author":"L Herrington","year":"2021","journal-title":"J Strength Cond Res"},{"issue":"8","key":"pone.0269695.ref008","doi-asserted-by":"crossref","first-page":"1469","DOI":"10.1177\/0363546508316764","article-title":"Strength imbalances and prevention of hamstring injury in professional soccer players: a prospective study.","volume":"36","author":"J-L Croisier","year":"2008","journal-title":"Am J Sports Med"},{"issue":"15","key":"pone.0269695.ref009","doi-asserted-by":"crossref","first-page":"946","DOI":"10.1136\/bjsports-2015-095908","article-title":"Likelihood of ACL graft rupture: not meeting six clinical discharge criteria before return to sport is associated with a four times greater risk of rupture.","volume":"50","author":"P Kyritsis","year":"2016","journal-title":"Br J Sports Med"},{"issue":"1","key":"pone.0269695.ref010","first-page":"E29","article-title":"Drop Jump Asymmetry is Associated with Reduced Sprint and Change-of-Direction Speed Performance in Adult Female Soccer Players.","volume":"7","author":"C Bishop","year":"2019","journal-title":"Sports Basel Switz"},{"issue":"3","key":"pone.0269695.ref011","doi-asserted-by":"crossref","first-page":"787","DOI":"10.1519\/JSC.0000000000003526","article-title":"The Association Between Interlimb Asymmetry and Athletic Performance Tasks: A Season-Long Study in Elite Academy Soccer Players.","volume":"36","author":"C Bishop","year":"2022","journal-title":"J Strength Cond Res"},{"key":"pone.0269695.ref012","doi-asserted-by":"crossref","first-page":"81","DOI":"10.1016\/j.humov.2018.03.016","article-title":"Correlation between quadriceps and hamstrings inter-limb strength asymmetry with change of direction and sprint in U21 elite soccer-players.","volume":"59","author":"G Coratella","year":"2018","journal-title":"Hum Mov Sci"},{"issue":"4","key":"pone.0269695.ref013","doi-asserted-by":"crossref","first-page":"213","DOI":"10.3233\/IES-2009-0356","article-title":"Validity of isokinetic testing for previous hamstring injury detection in soccer players.","volume":"17","author":"TAW Houweling","year":"2009","journal-title":"Isokinet Exerc Sci"},{"issue":"6","key":"pone.0269695.ref014","doi-asserted-by":"crossref","DOI":"10.1519\/SSC.0000000000000319","article-title":"Technique, Variation, and Progression of the Rear-Foot-Elevated Split Squat.","volume":"39","author":"K McCurdy","year":"2017","journal-title":"Strength Cond J"},{"issue":"3","key":"pone.0269695.ref015","first-page":"190","article-title":"The Reliability of 1- and 3Rm Tests of Unilateral Strength in Trained and Untrained Men and Women.","volume":"3","author":"K McCurdy","year":"2004","journal-title":"J Sports Sci Med"},{"issue":"12","key":"pone.0269695.ref016","doi-asserted-by":"crossref","first-page":"3269","DOI":"10.1519\/JSC.0000000000003378","article-title":"Validity and Reliability of the Rear Foot Elevated Split Squat 5 Repetition Maximum to Determine Unilateral Leg Strength Symmetry.","volume":"33","author":"M Helme","year":"2019","journal-title":"J Strength Cond Res"},{"key":"pone.0269695.ref017","article-title":"Is the Rear Foot Elevated Split Squat Unilateral? An Investigation Into the Kinetic and Kinematic Demands.","author":"M Helme","year":"2020","journal-title":"J Strength Cond Res"},{"issue":"3","key":"pone.0269695.ref018","first-page":"E58","article-title":"Using Unilateral Strength, Power and Reactive Strength Tests to Detect the Magnitude and Direction of Asymmetry: A Test-Retest Design.","volume":"7","author":"C Bishop","year":"2019","journal-title":"Sports Basel Switz"},{"issue":"11\u201312","key":"pone.0269695.ref019","doi-asserted-by":"crossref","first-page":"1296","DOI":"10.1080\/02640414.2019.1649525","article-title":"Comparing the magnitude and direction of asymmetry during the squat, countermovement and drop jump tests in elite youth female soccer players.","volume":"38","author":"C Bishop","year":"2020","journal-title":"J Sports Sci"},{"issue":"1","key":"pone.0269695.ref020","first-page":"18","article-title":"Inter-limb asymmetry during rehabilitation understanding formulas and monitoring the\" magnitude\" and\" direction\".","volume":"9","author":"C Bishop","year":"2020","journal-title":"Aspetar Sports Med J"},{"issue":"3","key":"pone.0269695.ref021","doi-asserted-by":"crossref","first-page":"695","DOI":"10.1519\/JSC.0000000000002729","article-title":"Interlimb Asymmetries: The Need for an Individual Approach to Data Analysis.","volume":"35","author":"C Bishop","year":"2021","journal-title":"J Strength Cond Res"},{"issue":"1","key":"pone.0269695.ref022","doi-asserted-by":"crossref","first-page":"39","DOI":"10.4085\/1062-6050-44.1.39","article-title":"Explosive strength imbalances in professional basketball players.","volume":"44","author":"M Schiltz","year":"2009","journal-title":"J Athl Train"},{"issue":"5","key":"pone.0269695.ref023","doi-asserted-by":"crossref","first-page":"444","DOI":"10.1016\/j.jsams.2012.01.003","article-title":"Correlation of isokinetic and novel hand-held dynamometry measures of knee flexion and extension strength testing.","volume":"15","author":"R Whiteley","year":"2012","journal-title":"J Sci Med Sport"},{"issue":"6","key":"pone.0269695.ref024","first-page":"E82","article-title":"Bilateral Deficit and Bilateral Performance: Relationship with Sprinting and Change of Direction in Elite Youth Soccer Players.","volume":"8","author":"G Ascenzi","year":"2020","journal-title":"Sports Basel Switz"},{"issue":"7","key":"pone.0269695.ref025","doi-asserted-by":"crossref","first-page":"724","DOI":"10.1111\/sms.12678","article-title":"Effects of velocity loss during resistance training on athletic performance, strength gains and muscle adaptations.","volume":"27","author":"F Pareja-Blanco","year":"2017","journal-title":"Scand J Med Sci Sports"},{"issue":"1","key":"pone.0269695.ref026","doi-asserted-by":"crossref","first-page":"15","DOI":"10.1186\/s13104-018-3128-9","article-title":"Intrarater reliability of the Humac NORM isokinetic dynamometer for strength measurements of the knee and shoulder muscles.","volume":"11","author":"B Habets","year":"2018","journal-title":"BMC Res Notes"},{"issue":"3","key":"pone.0269695.ref027","first-page":"801","article-title":"Intra- and interrater reliability of the establishment of one repetition maximum on squat and seated knee extension.","volume":"21","author":"SKB Tagesson","year":"2007","journal-title":"J Strength Cond Res"},{"issue":"10","key":"pone.0269695.ref028","doi-asserted-by":"crossref","first-page":"615","DOI":"10.2165\/00007256-200232100-00002","article-title":"Muscle strength testing: use of normalisation for body size","volume":"32","author":"S. Jaric","year":"2002","journal-title":"Sports Med Auckl NZ"},{"issue":"5","key":"pone.0269695.ref029","first-page":"360","article-title":"Understanding interobserver agreement: the kappa statistic.","volume":"37","author":"AJ Viera","year":"2005","journal-title":"Fam Med."},{"issue":"11","key":"pone.0269695.ref030","doi-asserted-by":"crossref","first-page":"2044","DOI":"10.1249\/mss.0b013e31814fb55c","article-title":"A vertical jump force test for assessing bilateral strength asymmetry in athletes.","volume":"39","author":"FM Impellizzeri","year":"2007","journal-title":"Med Sci Sports Exerc"},{"issue":"9","key":"pone.0269695.ref031","doi-asserted-by":"crossref","first-page":"709","DOI":"10.1136\/bjsm.2010.077560","article-title":"Intrinsic risk factors of non-contact quadriceps and hamstring strains in soccer: a prospective study of 100 professional players.","volume":"45","author":"K Fousekis","year":"2011","journal-title":"Br J Sports Med"},{"issue":"18","key":"pone.0269695.ref032","doi-asserted-by":"crossref","first-page":"1364","DOI":"10.1136\/bjsports-2013-093016","article-title":"At return to play following hamstring injury the majority of professional football players have residual isokinetic deficits.","volume":"48","author":"JL Tol","year":"2014","journal-title":"Br J Sports Med"},{"issue":"2","key":"pone.0269695.ref033","first-page":"153","article-title":"Comparison of unilateral squat strength between the dominant and non-dominant leg in men and women.","volume":"4","author":"K McCurdy","year":"2005","journal-title":"J Sports Sci Med"},{"issue":"2","key":"pone.0269695.ref034","doi-asserted-by":"crossref","first-page":"217","DOI":"10.1111\/sms.13569","article-title":"Device and method matter: A critical evaluation of eccentric hamstring muscle strength assessments.","volume":"30","author":"H-P Wiesinger","year":"2020","journal-title":"Scand J Med Sci Sports"}],"container-title":["PLOS ONE"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/dx.plos.org\/10.1371\/journal.pone.0269695","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2022,6,24]],"date-time":"2022-06-24T13:45:15Z","timestamp":1656078315000},"score":1,"resource":{"primary":{"URL":"https:\/\/dx.plos.org\/10.1371\/journal.pone.0269695"}},"subtitle":[],"editor":[{"given":"Riccardo","family":"Di Giminiani","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"editor"}]}],"short-title":[],"issued":{"date-parts":[[2022,6,24]]},"references-count":34,"journal-issue":{"issue":"6","published-online":{"date-parts":[[2022,6,24]]}},"URL":"https:\/\/doi.org\/10.1371\/journal.pone.0269695","relation":{},"ISSN":["1932-6203"],"issn-type":[{"value":"1932-6203","type":"electronic"}],"subject":[],"published":{"date-parts":[[2022,6,24]]}}}