  In the relativistic Quantum Molecular Dynamics (RQMD) approach baryons are
described within the framework of covariant hamilton constraint dynamics. The
inclusion of a relativistic mean field results in a quasiparticle picture for
the baryons. This requires to distinguish between canonical and kinetic
variables of the particles. As resonances we include the $\Delta$(1232) and the
$N^*$(1440) resonance. The resonance masses are distributed according
Breit-Wigner functions. However, the scalar self energy leads to a shift in the
masses and introduces an additional medium dependence. Consequences of this
description on resonance and pion dynamics are discussed.
