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Lifestyle programmes targeting former athletes who have gained substantial fat mass (FM) postsports career are lacking. We studied the effects of the Champ4Life programme on body composition and other health-related outcomes in former elite athletes with overweight or obesity.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Ninety-four former athletes(42.4\u00b17.3 y, 34.0% female) were recruited and randomly assigned to either an intervention group (IG; n=49) or a control group (CG; n=45). The IG attended 12 educational sessions addressing physical activity, weight management and nutrition. They also had a nutrition appointment aimed to prescribe a moderate caloric deficit(~300\u2013500 kcal\/day). Dual-energy X-ray absorptiometry was used to assess body composition. The Short-Form Health Survey-36 questionnaire was used to measure general health-related quality of life. Blood samples were collected to assess cardiometabolic health parameters.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>At 12 months, the IG lost more weight (estimated difference (ED)=\u22125.3 kg; \u22126.9 to \u22123.8), total FM (ED=\u22124.1 kg; \u22125.4 to \u22122.8) and abdominal FM (ED=\u22120.49 kg; \u22120.64 to \u22120.33) than did the CG (p\u2019s&lt;0.001). Cardiometabolic health markers also improved significantly (p&lt;0.05) more in the IG at 12 months (insulin (ED=\u22124.9 \u03bcU\/mL;\u22128.0 to \u22121.8); homoeostatic model assessment (ED=\u22121.2; \u22122.1 to \u22120.4); total cholesterol (ED=\u221221.8 mg\/dL; -35.4 to \u22128.2); low-density lipoprotein (ED=18.2 mg\/dL;\u221229.2 to \u22127.1)), as did quality-of-life dimensions (physical functioning (ED=11.7; 6.5 to 16.9); physical role (ED=17.6; 2.1 to 33.0); general health (ED=19.4; 11.4 to 27.4); vitality (ED=13.3; 5.3 to 21.3) and mental health (ED=12.3; 4.1 to 20.6)).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>The Champ4Life programme was effective in substantially reducing total and abdominal FM while preserving fat-free mass and improving health-related markers. These findings will enable evidence-based decisions when implementing lifestyle interventions targeting retired elite athletes.<\/jats:p><\/jats:sec><jats:sec><jats:title>Trial registeration number<\/jats:title><jats:p><jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"clintrialgov\" xlink:href=\"NCT03031951\">NCT03031951<\/jats:ext-link>.<\/jats:p><\/jats:sec>","DOI":"10.1136\/bjsports-2021-104212","type":"journal-article","created":{"date-parts":[[2021,10,1]],"date-time":"2021-10-01T18:28:58Z","timestamp":1633112938000},"page":"394-402","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":15,"title":["Effectiveness of a lifestyle weight-loss intervention targeting inactive former elite athletes: the Champ4Life randomised controlled 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