Table 1.

Histological changes in lung tissue induced by the 8-week exercise training program in rats supplemented with ascorbic acid and silymarin.

Group	Alveolar Size	Type 1 Pneumocytes	Type 2 Pneumocytes	Vascularization	Inflammation	Bronchial muscle	Connective Tissue	Alveolar Wall Thickness	Pleural Tissue Thickness
Control	+/++	++++	++	++	+	+	+	++	+
ET	+++	++++	+	+++	++/+++	+++	++	++/+++	++
ET+Aa	+++	++++	++	+++	++	+++	+	++	+
ET+Sm	++++	++++	++	++++	+	++++	+	+	+

Criteria: 0 = Null (no presence/appearance), + = Low (minimal presence/appearance), ++ = Moderate (intermediate presence/appearance), +++ = High (important presence/appearance), ++++ = Remarkably high (notable presence/appearance).