{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,5]],"date-time":"2026-03-05T23:40:43Z","timestamp":1772754043595,"version":"3.50.1"},"reference-count":64,"publisher":"Human Kinetics","issue":"1","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2020,1,1]]},"abstract":"<jats:p><jats:italic><jats:bold>Purpose<\/jats:bold>:<\/jats:italic> The \u201c11+ Kids\u201d injury-prevention program has been shown to reduce injuries and related costs in youth football players less than 14 y of age. A major argument to convince coaches to use this exercise-based injury-prevention program is a potential performance enhancement of the players. Therefore, this study investigated the effects of the \u201c11+ Kids\u201d program on isokinetic strength. <jats:italic><jats:bold>Methods<\/jats:bold>:<\/jats:italic> Two teams were randomly assigned to the intervention and control groups. The intervention group replaced their warm-up by the \u201c11+ Kids\u201d and the control group warmed up as usual. Two days before and after the 10-wk intervention, isokinetic strength of the hip adductors and abductors, knee flexors and extensors, and ankle invertors and evertors was tested. <jats:italic><jats:bold>Results<\/jats:bold>:<\/jats:italic> Thirty-one players (mean age\u200911.5 [0.8]\u00a0y) completed the study. The intervention group showed large improvements in all isokinetic strength measures (<jats:italic>P<\/jats:italic>\u2009&lt;\u2009.001 for all measures; Cohen <jats:italic>d<\/jats:italic>\u2009=\u20090.8\u20131.4), whereas the control group only showed negligible to medium positive effects (<jats:italic>P<\/jats:italic> values ranging from .006 to .718; Cohen <jats:italic>d<\/jats:italic>\u2009=\u2009\u22120.1 to 0.7). The intervention was beneficial compared with the control group regarding isokinetic strength of the hip adductors (<jats:italic>P<\/jats:italic>\u2009&lt;\u2009.001), knee flexors (<jats:italic>P<\/jats:italic>\u2009=\u2009.002), and ankle evertors (<jats:italic>P<\/jats:italic>\u2009&lt;\u2009.001) and invertors (<jats:italic>P<\/jats:italic>\u2009=\u2009.005). <jats:italic><jats:bold>Conclusions<\/jats:bold>:<\/jats:italic> Given the relatively short intervention period of 10 wk, the observed improvements relate to a practically meaningful effect of the intervention. The gain in strength may improve players\u2019 performance and may contribute to a reduction of injury risk in the long-term application.<\/jats:p>","DOI":"10.1123\/ijspp.2018-0827","type":"journal-article","created":{"date-parts":[[2019,4,8]],"date-time":"2019-04-08T13:20:22Z","timestamp":1554729622000},"page":"25-30","source":"Crossref","is-referenced-by-count":21,"title":["The Effect of the \u201c11+ Kids\u201d Program on the Isokinetic Strength of Young Football Players"],"prefix":"10.1123","volume":"15","author":[{"given":"Mostafa","family":"Zarei","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hamed","family":"Abbasi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Abdolhamid","family":"Daneshjoo","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mehdi","family":"Gheitasi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kamran","family":"Johari","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Oliver","family":"Faude","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nikki","family":"Rommers","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Roland","family":"R\u00f6ssler","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"100","reference":[{"key":"ref151","doi-asserted-by":"crossref","first-page":"549","DOI":"10.1080\/02640414.2015.1099715","article-title":"A new injury prevention programme for children\u2019s football\u2014FIFA 11+ Kids\u2014can improve motor performance: a cluster-randomised controlled trial","volume":"34","author":"R\u00f6ssler","year":"2016","journal-title":"J Sports Sci"},{"key":"ref51","doi-asserted-by":"crossref","first-page":"281","DOI":"10.5604\/20831862.1077554","article-title":"The effects of injury prevention warm-up programmes on knee strength in male soccer players","volume":"30","author":"Daneshjoo","year":"2013","journal-title":"Biol Sport"},{"key":"ref141","doi-asserted-by":"crossref","first-page":"309","DOI":"10.1136\/bjsports-2018-099395","article-title":"Comparison of the \u201811+ Kids\u2019 injury prevention programme and a regular warmup in children\u2019s football (soccer): a cost effectiveness analysis","volume":"53","author":"R\u00f6ssler","year":"2019","journal-title":"Br J Sports Med"},{"key":"ref601","doi-asserted-by":"crossref","first-page":"507","DOI":"10.1136\/bjsm.37.6.507","article-title":"Comprehensive isokinetic knee measurements and quadriceps tendon evaluations in footballers for assessing functional performance","volume":"37","author":"Ozcakar","year":"2003","journal-title":"Br J Sports Med"},{"key":"ref401","doi-asserted-by":"crossref","first-page":"205","DOI":"10.1007\/s40279-015-0404-x","article-title":"How effective are F-MARC injury prevention programs for soccer players? 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