  In twist-bend nematic (N\textsubscript{TB}) liquid crystals (LCs), the mean
molecular orientation exhibits heliconical structure with nanoscale
periodicity. On the mesoscopic scale, N\textsubscript{TB} resembles layered
systems (like smectics), where the helical pitch is equivalent to
"pseudo-layers" without a true mass density wave. We study rheological
properties of a N\textsubscript{TB} phase and compare the results with those of
an usual SmA phase. Analysing the shear response and adapting a simplified
physical model for rheology of defect mediated lamellar systems we measure the
pseudo-layer compression elastic constant $B_{eff}$ of N\textsubscript{TB}
phase from the measurements of dynamic modulus $G^{*}(\omega)$. We find that
$B_{eff}$ of the N\textsubscript{TB} phase is in the range of $10^{3}-10^{6}$
Pa and it follows a temperature dependence, $B_{eff}\sim (T_{TB}-T)^{2}$ as
predicted by the recent coarse-grained elastic theory. Our results show that
the structural rheology of N\textsubscript{TB} is strikingly similar to that of
the usual smectic LCs although the temperature dependence of $B_{eff}$ is much
faster than smectic LCs as predicted by the coarse-grained models.
