  We consider the quantum quench dynamics of a Heisenberg-Ising spin ladder
which is an archetypal model in which confinement of elementary excitations is
triggered by internal interactions rather than an external field. We show that
the confinement strongly affects the light cone structure of correlation
functions providing signatures of the velocities of the mesons of the model. We
also show that the meson masses can be measured from the real time analysis of
the evolution of the order parameter.
