[Energy balance among female athletes].

Athletes need to consume sufficient energy to meet their training demands, maintain their health, and if young, to ensure their growth and development. Athletes are often preoccupied by their body weight and shape, and in some sports might be subjected to pressure to lose weight by coaches, peers or themselves. Eating disorders and poor eating habits are prevalent among female athletes, especially in sport disciplines where low body weight is required to improve performance or for "aesthetic" appearance or in weight category sports. Low energy intake has deleterious effects on many systems, including the cardiovascular system, several hormonal pathways, musculoskeletal system, fluids and electrolytes, thermoregulation, growth and development. Various fitness components and overall performance are also negatively affected. All these, together with poor nutritional status that causes vitamin and mineral deficiencies, poor concentration and depression, put the athlete at an increased injury risk. Energy availability is now recognized as the primary factor initiating these health problems. Energy availability is defined as dietary energy intake minus exercise energy expenditure. If below 30 kcal/kg fat free mass per day, reproductive system functions, as well as other metabolic systems, might be suppressed. The case presented is of a young female Judoka, who complained of fatigue and weakness. Medical and nutritional assessment revealed that she suffered from low energy availability, which slowed her growth and development, and negatively affected her health and athletic performance. This case study emphasizes the importance of adequate energy availability in young female athletes in order to ensure their health.