protocolSection identificationModule nctId: NCT06371963, orgStudyIdInfo id: LinnaeusU REDs, briefTitle: Relative Energy Deficiency in Sports (REDs) in Swedish Athletes, acronym: REDs-Sweden, statusModule overallStatus: RECRUITING, startDateStruct date: 2022-05-10, primaryCompletionDateStruct date: 2024-05, completionDateStruct date: 2026-12, studyFirstPostDateStruct date: 2024-04-17, lastUpdatePostDateStruct date: 2024-04-18, sponsorCollaboratorsModule leadSponsor name: Linnaeus University, class: OTHER, collaborators name: Swedish Olympic Committee, collaborators name: Swedish Research Council for Sport Science, collaborators name: World Anti-Doping Agency, descriptionModule briefSummary: Background: Relative Energy Deficiency in Sport (REDs) describes impairment of health and performance due to problematic (long-term/severe) low energy availability (LEA), with or without eating disorders. LEA is frequently reported in sports with high training volumes, especially in leanness demanding sports, and 20% of female and 9% of male Norwegian national team athletes have been reported to have eating disorders. Potential trigger factors are e.g., dieting, injuries, coaching behavior, and subculture aspects e.g., focus on low body weight. The main questions that will be addressed are: 1. What is the prevalence of eating disorders and REDs among Swedish elite athletes and controls? 2. What is the impact of problematic LEA on health and performance aspects in both male and female athletes? Methods: National team athletes and gender and matched controls will be invited to an anonymous on-line survey. Elite athletes who agree to participate, will be invited to assessment of eating disorders, nutritional and physiological status (e.g., metabolic and endocrine markers, bone health, microbiota, dietary intake, energy availability, and performance)., conditionsModule conditions: RED S, conditions: Eating Disorders, designModule studyType: OBSERVATIONAL, designInfo observationalModel: COHORT, timePerspective: CROSS_SECTIONAL, enrollmentInfo count: 500, type: ESTIMATED, armsInterventionsModule, outcomesModule primaryOutcomes measure: Self-reported eating disorders, secondaryOutcomes measure: Eating disorders, secondaryOutcomes measure: Self-reported reproductive function in females not using hormonal contraceptives, secondaryOutcomes measure: Reproductive function in females not using hormonal contraceptives, secondaryOutcomes measure: Self-reported reproductive function in males, secondaryOutcomes measure: Reproductive function in males, secondaryOutcomes measure: Gastrointestinal function, secondaryOutcomes measure: Injury, secondaryOutcomes measure: Self- reported symptoms of depression, secondaryOutcomes measure: Compulsive exercise, secondaryOutcomes measure: The motivation for behavioral changes, secondaryOutcomes measure: Psychological flexibility, secondaryOutcomes measure: Changes in immune markers from pre to post exercise, secondaryOutcomes measure: Microbiota, secondaryOutcomes measure: Dietary intake, secondaryOutcomes measure: Maximal aerobic capacity, secondaryOutcomes measure: Explosive lower body power, secondaryOutcomes measure: Whole body strength, secondaryOutcomes measure: Muscular power, secondaryOutcomes measure: Resting Metabolic Rate, secondaryOutcomes measure: Body composition, secondaryOutcomes measure: Body weight, secondaryOutcomes measure: Body height, secondaryOutcomes measure: Glucose levels, eligibilityModule sex: ALL, minimumAge: 18 Years, maximumAge: 45 Years, stdAges: ADULT, contactsLocationsModule locations facility: Linnaeus University, status: RECRUITING, city: Kalmar, state: Småland, country: Sweden, contacts name: Anna Melin, PhD, role: CONTACT, phone: 0732629714, email: anna.melin@lnu.se, geoPoint lat: 56.66157, lon: 16.36163, hasResults: False