  Renormalization factors for local vector and axial vector currents for the
Wilson quark action are perturbatively calculated to one loop order including
finite quark masses from the ratio of the on-shell quark matrix elements in the
Feynman gauge defined on the lattice and in the continuum. For large quark
masses of order unity in lattice units, we find that finite quark mass effects
are quite large: one-loop coefficients of the renormalization factors differ by
100% compared to those in the massless limit.
