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The aim of this applied field study was to investigate the effectiveness of consuming a protein\u2010based supplement containing 1546\u2005mg of omega\u20103 polyunsaturated fatty acid (PUFA) (551\u2005mg eicosapentaenoic acid (EPA) and 551\u2005mg docosahexaenoic acid (DHA)) twice daily (FO) compared to a protein\u2010based placebo (P) on muscle soreness, countermovement jump (CMJ) performance and psychological well\u2010being in 20 professional Rugby Union players during 5 weeks of pre\u2010season training. Players completed a 5\u2010point\u2010Likert soreness scale with 5\u00a0indicating \u201cno soreness\u201d and a questionnaire assessing fatigue, sleep, stress and mood each morning of training, plus they performed CMJ tests once or twice per week. Data were analysed using magnitude\u2010based inferential statistics and are presented as percent beneficial\/trivial\/harmful. On day 35, there was a likely (% beneficial\/trivial\/harmful: 94\/5\/1) moderate (0.75, standardized mean difference (SMD)) beneficial effect of FO vs. P on the change in lower body muscle soreness compared with day 0 (FO: \u22123.8 \u00b1 21.7%; P: \u221219.4 \u00b1 11.2%). There was a likely (92\/7\/0) moderate (SMD: 0.60) beneficial effect of FO vs. P on CMJ performance (change from baseline to day 35, FO: +4.6 \u00b1 5.9%; P:\u00a0\u22123.4 \u00b1 8.6%). From day 20, a moderate beneficial effect of FO on fatigue was observed. In terms of practical relevance, the moderate beneficial effect of adding fish oil to a protein\u2010based supplement on muscle soreness translated into the better maintenance of explosive power in elite Rugby Union players during pre\u2010season training.<\/jats:p>","DOI":"10.1080\/17461391.2018.1491626","type":"journal-article","created":{"date-parts":[[2018,7,9]],"date-time":"2018-07-09T16:02:16Z","timestamp":1531152136000},"page":"1357-1367","update-policy":"https:\/\/doi.org\/10.1080\/tandf_crossmark_01","source":"Crossref","is-referenced-by-count":55,"title":["Adding omega\u20103 fatty acids to a protein\u2010based supplement during pre\u2010season training results in reduced muscle soreness and the better maintenance of explosive power in professional Rugby Union players"],"prefix":"10.1002","volume":"18","author":[{"given":"Katherine Elizabeth","family":"Black","sequence":"first","affiliation":[{"name":"Department of Human Nutrition University of Otago Dunedin New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Oliver C.","family":"Witard","sequence":"additional","affiliation":[{"name":"Faculty of Health Sciences and Sport University of Stirling Scotland UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dane","family":"Baker","sequence":"additional","affiliation":[{"name":"Chiefs Super Rugby Franchise Hamilton New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Philip","family":"Healey","sequence":"additional","affiliation":[{"name":"Chiefs Super Rugby Franchise Hamilton New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Victoria","family":"Lewis","sequence":"additional","affiliation":[{"name":"Department of Human Nutrition University of Otago Dunedin New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Francisco","family":"Tavares","sequence":"additional","affiliation":[{"name":"Chiefs Super Rugby Franchise Hamilton New Zealand"},{"name":"Health, Sport and Human Performance Waikato University Hamilton New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sam","family":"Christensen","sequence":"additional","affiliation":[{"name":"Department of Human Nutrition University of Otago Dunedin New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tom","family":"Pease","sequence":"additional","affiliation":[{"name":"Health, Sport and Human Performance Waikato University Hamilton New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brett","family":"Smith","sequence":"additional","affiliation":[{"name":"Chiefs Super Rugby Franchise Hamilton New Zealand"},{"name":"Health, Sport and Human Performance Waikato University Hamilton New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2018,7,9]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0899\u20109007(03)00162\u2010X"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.1139\/o59\u2010099"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.plefa.2006.05.012"},{"key":"e_1_2_10_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.bbalip.2014.08.010"},{"key":"e_1_2_10_6_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00421\u2010011\u20102134\u20106"},{"key":"e_1_2_10_7_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00421\u2010003\u20101012\u20102"},{"key":"e_1_2_10_8_1","doi-asserted-by":"publisher","DOI":"10.1249\/MSS.0b013e31828b7dd0"},{"issue":"1","key":"e_1_2_10_9_1","first-page":"176","article-title":"Effects of short\u2010term docosahexaenoic acid supplementation on markers of inflammation after eccentric strength exercise in women","volume":"15","author":"Corder K. 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