  We propose an approach to the problem of low but finite temperature dynamical
correlation functions in integrable one-dimensional models with a spectral gap.
The approach is based on the analysis of the leading singularities of the
operator matrix elements and is not model specific. We discuss only models with
well defined asymptotic states. For such models the long time, large distance
asymptotics of the correlation functions fall into two universality classes.
These classes differ primarily by whether the behavior of the two-particle S
matrix at low momenta is diagonal or corresponds to pure reflection. We discuss
similarities and differences between our results and results obtained by the
semi-classical method suggested by Sachdev and Young, Phys. Rev. Lett. {\bf
78}, 2220 (1997).
