According to the early application of different doses of amino acids , they were randomized into low-dose group ( n = @ , @ g/kg per day with an increase of @ g/kg daily and a maximum of @ g/kg per day ) , medium-dose group ( n = @ , @ g/kg per day with an increase of @ g/kg daily and a maximum of @ g/kg per day ) , and high-dose group ( n = @ , @ g/kg per day with an increase of @-@ @ g/kg daily and a maximum of @ g/kg per day ) .