  The recently obtained experimental result for the quenching of the GT sum
rule in the reaction ^90Zr(p,n)^90Nb is used to extract the value of the
Landau-Migdal parameter g_{N\Delta}', taking into account also the effect of
the finite range meson exchange interactions. The extracted value is compared
to the one obtained in the \pi+\rho exchange model by explicitly taking into
account the effects of antisymmetrization and short range correlations.
Although the \pi+\rho exchange model tends to give a somewhat stronger
quenching than observed experimentally, the results are consistent within the
experimental error bars if the quark model value for the parameter
f_\Delta/f_\pi is used.
