Fig. 2From: Association of serum bone- and muscle-derived factors with age, sex, body composition, and physical function in community-dwelling middle-aged and elderly adults: a cross-sectional studyAssociations of serum IGF-1 and myostatin with age in both sexes. (a) IGF-1 is negatively correlated with age in men (r = − 0.290, p < 0.001). (b) IGF-1 is negatively correlated with age in women (r = − 0.296, p = 0.003). (c) Myostatin does not correlate with age in men (r = 0.058, p = 0.474). (d) Myostatin does not correlate with age in women (r = − 0.029, p = 0.781)Back to article page