We study the dielectric relaxation of polycarbonate (PC) at room temperature under imposed strain rate γ̇, above the yield stress, and up to 13% strain. We find that the dielectric response of stretched PC behaves as if it was heated up at a temperature just below its glass transition temperature, Tg around 423 K for PC. Indeed, in the frequency range of our experiment (10^–2 and 10^3 Hz), the dielectric response of the stretched PC at room temperature superimposes to the dielectric response of PC at a temperature T_a (gamma_dot) < Tg, which is a function of strain rate. Specifically we observe that at T_a the dominant relaxation time tau_alpha(T_a) of PC at rest is related to gamma_dot in such a way that tau_alpha(T_a) ∼ 1/gamma_dot at and beyond the yield point. In our experiment, 10^–5 s^–1 < gamma_dot< 10^–3 s^–1, the temperature shifts Tg – T_a are of a few kelvin. The mechanical rejuvenation modifies the dielectric response at frequencies smaller than 10 Hz, whereas for higher frequencies the spectrum is only slightly modified.