[en] It is shown that in a correlated model of spin-isospin saturated nuclear matter the tensor terms of the potentials yield a mean excitation energy for the axial current in the total muon capture rates that is above the maximum available one, i.e., the muon mass, thus making totally non-quantitative the use of sum rules for the process. This is an agreement with an analogous role played by tensor correlations in space-like low momentum transverse (e, e') scattering on nuclei and confirms the missing strength argument for Gamow-Teller transitions. (orig.)