[en] Materials with high superconducting transition temperatures frequently exhibit anomalous features in their phonon dispersion curves. The origin of these anomalies and their significance for superconductivity has been the subject of much debate. Two seemingly different models have been proposed to explain these anomalies in terms of the electron-phonon interaction. The first model focuses on real space charge-density distortions (CDD's), while the second emphasizes the states in reciprocal space near the Fermi energy. To test the assumptions in these models and to better understand the details of the electronic response to lattice vibrations in transition metals self-consistent frozen phonon calculations were performed for the (2/3, 2/3, 2/3) phonon in Nb and Mo. Initial results are reported for the CDD's associated with this phonon and discuss the differences between Nb and Mo