Clinical Research Directory

Inclusion Criteria: * Subjects aged 18 to 35 (inclusive), * exercising at least 4 sessions of endurance or weight-based sporting activities per week for a performance objective, * having variations of at least 5% of their weight body during the last 3 sporting seasons (a sporting season corresponds to a year during which alternates the periods of training, recovery and participation in official competitions). * Subject capable of providing informed consent to participate * Subject with a social security insurance. Exclusion Criteria: * Medical or surgical history deemed by the investigator to be incompatible with the study. * Presence of chronic pathology. * Disorders of eating behavior. * Subjects born very prematurely defined as a pregnancy inferior to 28 weeks. * Subjects having used a treatment for a small stature (eg growth hormone). * For women: irregular menstruation (changes in menstrual cycles ≥ 6 days). * Sports subjects with a stable weight during the last three sporting seasons (weight variation \<5%). * Take medication that can change body temperature. * Pregnant or lactating women. * Subjects with gastrointestinal complications and / or contraindications to ingestion of the capsule (eg diverticulosis, inflammatory bowel disease, gastrointestinal surgery ...). * Subjects needing MRI during ingestion of the capsule or having a pacemaker or other implanted electro-medical device. * Person under guardianship or not subject to a social security scheme. * Refusal to sign the information and consent leaflet. * Refusal of participation