Energy Availability in Male Athletes Across the Season

The aim of proposed cohort observational study is assessing the risk of low energy availability and relative energy deficiency in sport in competitive adult male athletes. The changes in athlete's energy availability, health biomarkers in blood, gut microbiota composition and performance will be determined in 3 key stages across the season: during preparation, competition and transition period in a subset of athletes. The study is investigating following specific aims in the cohort of male competitive athletes: Correlation between energy availability and resting metabolic rate and metabolic functions across the season. Correlation between energy availability and reproductive functions across the season. Correlation between energy availability and hematological biomarkers across the season. Correlation between energy availability and gut microbiota composition across the season. Correlation between energy availability and performance across the season.