Figure 1. (A) From ELISA, a quantitative representation of the means (±SD) for the levels of serum myostatin prior to and 6-hr, 24-hr, and 48-hr after eccentric (ECC) and concentric (CON) muscle contractions. * significantly different from pre-exercise value, † significantly different from 6-hr value (p < 0.05). (B) From immuno-blotting, a qualitative representation of serum myostatin and anti-myostatin antibody reactivity in one participant after prior to exercise and 6-hr, 24-hr, and 48-hr after ECC and CON contractions.