{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T22:35:22Z","timestamp":1790030122924,"version":"4.0.1"},"reference-count":90,"publisher":"Human Kinetics","issue":"7","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2020,8,1]]},"abstract":"<jats:p><jats:italic><jats:bold>Purpose<\/jats:bold>:<\/jats:italic> To examine the differences between performing Nordic hamstring exercises once or twice a week on hamstring eccentric strength and other muscle-strain risk factors in high-level football players. <jats:italic><jats:bold>Methods<\/jats:bold>:<\/jats:italic> In this randomized trial, 32 football players (18\u201323 y old) completed an 8-week Nordic hamstring exercise training program in 1 of 2 experimental groups: group 1 (once a week; n\u2009=\u200915) and group 2 (twice a week; n\u2009=\u200917). Knee-flexor\/extensor peak torques and biceps femoris long-head muscle architecture were assessed through isokinetic dynamometry and ultrasonography, respectively, before and after the training programs. Analysis of covariance, effect sizes (ESs), and <jats:italic>t<\/jats:italic> tests for percentage change were used to assess the effect of the 2 interventions on the outcome measures. <jats:italic><jats:bold>Results<\/jats:bold>:<\/jats:italic> Group 2 demonstrated higher hamstring concentric peak torque than group 1 posttraining (155\u2013164 vs 149\u2013158\u00a0N\u00b7m; <jats:italic>P<\/jats:italic>\u2009=\u2009.043; ES\u2009=\u20090.27), although there was also a statistical trend for higher hamstring eccentric peak torque (212\u2013234 vs 198\u2013221\u00a0N\u00b7m; <jats:italic>P<\/jats:italic>\u2009=\u2009.098; ES\u2009=\u20090.37), hamstring-to-quadriceps conventional ratio (0.56\u20130.59 vs 0.54\u20130.57; <jats:italic>P<\/jats:italic>\u2009=\u2009.089; ES\u2009=\u20090.31), and hamstring-to-quadriceps functional ratio (0.76\u20130.84 vs 0.71\u20130.79; <jats:italic>P<\/jats:italic>\u2009=\u2009.076; ES\u2009=\u20090.50). No between-groups differences were found for muscle thickness (<jats:italic>P<\/jats:italic>\u2009=\u2009.864; ES\u2009=\u20090.12), pennation angle (<jats:italic>P<\/jats:italic>\u2009=\u2009.289; ES\u2009=\u20090.18), fascicle length (<jats:italic>P<\/jats:italic>\u2009=\u2009.406; ES\u2009=\u20090.03), and quadriceps concentric peak torque (<jats:italic>P<\/jats:italic>\u2009=\u2009.340; ES\u2009=\u20090.02). <jats:italic><jats:bold>Conclusion<\/jats:bold>:<\/jats:italic> Only the Nordic hamstring exercise training program performed twice a week strengthened the hamstrings of high-level football players, while similar changes in muscle architecture occurred with both once- and twice-weekly sessions.<\/jats:p>","DOI":"10.1123\/ijspp.2018-0780","type":"journal-article","created":{"date-parts":[[2020,6,24]],"date-time":"2020-06-24T08:21:57Z","timestamp":1592986917000},"page":"1026-1033","source":"Crossref","is-referenced-by-count":26,"title":["Effect of Weekly Training Frequency With the Nordic Hamstring Exercise on Muscle-Strain Risk Factors in Football Players: A Randomized Trial"],"prefix":"10.1123","volume":"15","author":[{"given":"Thales M.","family":"Medeiros","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jo\u00e3o B.","family":"Ribeiro-Alvares","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carolina G.","family":"Fritsch","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gabriel S.","family":"Oliveira","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lucas","family":"Severo-Silveira","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Evangelos","family":"Pappas","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bruno 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