The reversible shape memory effect can be suppressed even by a small opposing force, and so it has seemed impossible to generate large reactive stresses by means of repeatedly reversible shape changes. In this study it was shown that the temperature behaviour of the stresses and their magnitude depend on the structural state of the metal at the time at which deformation was registered. After the speciman was compressed in martensitic state, the reactive stresses during heating reached high values, for both the martensitic and the austensitic variety of the effect.