In ultra-curva, damage to the muscles to the resulting kidney damage is known. We examined whether the supply of amino acids before and during a 100 km run has an influence on parameters of muscle damage and renal function.Runner with intake of amino acids did not differ in the competition performance as well as the parameters of muscle damage and renal function. The summary can be found under https://pubmed.ncbi.nlm.nih.gov/23007065/