According to the early application of different doses of amino acids , they were randomized into low-dose group ( n = 29 , 1.0 g/kg per day with an increase of 1.0 g/kg daily and a maximum of 3.5 g/kg per day ) , medium-dose group ( n = 28 , 2.0 g/kg per day with an increase of 1.0 g/kg daily and a maximum of 3.7 g/kg per day ) , and high-dose group ( n = 29 , 3.0 g/kg per day with an increase of 0.5-1 .0 g/kg daily and a maximum of 4.0 g/kg per day ) .