Amino-acid-containing composition for enhancing recovery from muscle fatigue

A method of enhancing recovery of an amount of collagen protein in muscle decreased due to eccentric contraction exercise, comprising:

• administering to a subject in need thereof an effective amount of an amino acid-containing composition such that recovery of an amount of collagen protein in muscle is enhanced, wherein the amino acid-containing composition comprises, in a molar content ratio with respect to a total amount of leucine, isoleucine, valine, threonine, lysine, methionine, histidine, phenylalanine, and tryptophan,
• (1) 35 to 66% of leucine,
• (2) 5.0 to 15% of isoleucine,
• (3) 5.0 to 15% of valine,
• (4) 7.0 to 14% of threonine,
• (5) 8.0 to 16% of lysine,
• (6) 2.0 to 10% of methionine,
• (7) 0.1 to 3.5% of histidine,
• (8) 2.5 to 8.0% of phenylalanine, and
• (9) 0.1 to 2.0% of tryptophan,
• wherein the amino acid-containing composition is administered to the subject after the exercise.

A method of enhancing recovery of an amount of desmin protein in muscle decreased due to eccentric contraction exercise, comprising:

• administering to a subject in need thereof an effective amount of an amino acid-containing composition such that recovery of an amount of desmin protein in muscle is enhanced, wherein the amino acid-containing composition comprises, in a molar content ratio with respect to a total amount of leucine, isoleucine, valine, threonine, lysine, methionine, histidine, phenylalanine, and tryptophan,
• (1) 35 to 66% of leucine,
• (2) 5.0 to 15% of isoleucine,
• (3) 5.0 to 15% of valine,
• (4) 7.0 to 14% of threonine,
• (5) 8.0 to 16% of lysine,
• (6) 2.0 to 10% of methionine,
• (7) 0.1 to 3.5% of histidine,
• (8) 2.5 to 8.0% of phenylalanine, and
• (9) 0.1 to 2.0% of tryptophan,
• wherein the amino acid-containing composition is administered to the subject after the exercise.