Table 4.

Some characteristics of the myocardium in control rats and in those exposed to lead and cadmium oxide NP combination with and without bioprotection ($\overline{\mathrm{X}}$ ± s.e.).

Myocardium Characteristics	Group of Rats
	Controls	Exposed to CdO–NP + PbO–NP	Exposed to CdO–NP + PbO–NP along with BPC
Expression of α–MHC, %	92 ± 3	61 ± 3 *	85 ± 2 *▪
Expression of β–MHC, %	8 ± 3	39 ± 3 *	15 ± 3 *▪
Sliding velocity of thin filaments over myosin (VMAX), µm/s	4.90 ± 0.15	4.63 ± 0.22 *	4.81 ± 0.27 ▪
Velocity of trabeculae at working length corresponding to 0.95 LMAX and load corresponding to 0.9 P/P0, VMAX/Lw	0.53 ± 0.03	0.35 ± 0.03 *	0.54 ± 0.03 ▪
End–systolic length of trabeculae at working length corresponding to 0.95 LMAX and load corresponding to 0.6 P/P0, L/Lwork	0.94 ± 0.01	0.96 ± 0.00*	0.95 ± 0.01 ▪

Note: *—statistically significant difference from the control group, ▪—statistically significant difference from the group exposed to NPs (p < 0.05, Mann–Whitney U-test).