Muscle quality improvement agent
Agents containing γ-glutamyl peptide can prevent a decline in muscle quality and improve muscle quality even when exercise is limited, and further, can effectively enhance the effect of exercise even when the exercise is of a level free of undue efforts.
1 . A method for improving muscle quality, comprising administering to a subject in need thereof an effective amount of a γ-glutamyl peptide,
wherein said γ-glutamyl peptide is γ-glutamyl valine.
2 . The method according to claim 1 , wherein said γ-glutamyl peptide is administered in an amount of 0.01 mg/kg body weight to 10 g/kg body weight per day.
3 . The method according to claim 1 , wherein said γ-glutamyl peptide is administered in an amount of 0.05 mg/kg body weight to 5 g/kg body weight per day.
4 . The method according to claim 1 , wherein said γ-glutamyl peptide is administered in an amount of 0.1 mg/kg body weight to 1 g/kg body weight per day.
5 . The method according to claim 1 , wherein said subject is human.
6 . The method according to claim 1 , wherein said subject is an elderly person in need of nursing care.
7 . The method according to claim 1 , wherein said subject is experiencing a decline in physical function.
8 . The method according to claim 1 , wherein said subject is under restriction of exercise due to illness or injury.
9 . The method according to claim 1 , wherein the γ-glutamyl peptide is administered in the form of a composition which comprises said γ-glutamyl peptide in a concentration of 0.001 mM to 100 mM.