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We review our studies on the rho and sigma resonances properties derived fromthe Inverse Amplitude Method. In particular, we study the leading $1/N_c$behavior of the resonances masses and widths and their evolution with changing$m_\pi$. The $1/N_c$ expansion gives a clear definition of $\bar qq$ states,which is neatly satisfied by the $\rho$ but not by the sigma, showing that itsdominant component is not $\bar qq$. The $m_\pi$ dependence of the resonanceproperties is relevant to connect with lattice studies. We show that ourpredictions compare well with some lattice results and we find that therho-pi-pi coupling constant is $m_\pi$ independent, in contrast with thesigma-pi-pi$ coupling, that shows a strong $m_\pi$ dependence.

m_pi and N_c dependence of resonances from Unitarized Chiral Perturbation Theory