  We study the modification of the properties of the axial-vector meson,
dynamically generated through the unitarization procedure, in the vacuum where
the chiral symmetry is restored. This is accomplished by scaling the pion decay
constant as the chiral order parameter while keeping the other input parameters
fixed. We find that the mass and width of the axial-vector meson reduce to
those of the vector meson, as anticipated by the Weinberg sum rules. The
findings are consistent with the results of a recent QCD sum rule calculation,
wherein the chiral order parameter is expressed through chiral
symmetry-breaking four-quark operators, leading to the mass-squared difference
scaling in proportion to variations in the chiral order parameter. We calculate
the scaling behavior for the mass differences obtained from the unitarization
method using both the physical and massless pion masses.
