Fig. 9.

Dependence of the first isometric contraction amplitude after a 60 s pause reduced to the contraction amplitude before rest in steady state on the preparation stimulation frequency in trabecules (left panel) and papillary muscles (right panel) from the right ventricle of rats at constant preparation length 0.95 Lmax. The points with bars show mean values and standard errors of the mean. The differences are significant (p < 0.05) between the groups: ** - Cd vs. Cont; ^ - Pb + Cd vs. Cont.