The present invention addresses the problem of providing a novel muscle energy metabolism activator, etc. and a composition that can be taken as a drug or a food. To solve the above problem, the technical features of the present invention are as follows. (1) A glucose transporter (GLUT4) gene expression promoter comprising as an active ingredient at least one member selected from among 5-hydroxy-3,7-dimethoxyflavone, techtochrysin, 3,7,4'-trimethyl kaempferol, retusine, pentamethyl quercetin, trimethyl apigenin, tetramethyl kaempferol and 5,7-dimethoxyflavone. (2) A glucose transporter (GLUT4) gene expression promoter comprising as an active ingredient at least one member selected from techtochrysin and 5,7-dimethoxyflavone. (3) A glucose transporter (GLUT4) gene expression promoter in muscle cells, said promoter comprising at least one compound represented by chemical formula (1) [wherein R1 and R2 represent each hydrogen or an alkyl group having 1-3 carbon atoms].
