TABLE 1.

Histopathological scores and animal number with different degrees of injury in each group.

Groups	Myocardial	Pathology	Score
	No change	+	++	+++	++++	Mean
CTL (n = 5)	4	1	0	0	0	0.16
Ex (n = 5)	4	1	0	0	0	0.16
S (n = 6)	1	1	2	3	0	2*
Ex + S (n = 6)	2	1	0	3	0	1.6*

n, number of animals; CTL, control group; Ex, group which was subjected to exercise training for 8 weeks; S, group which was subjected to waterpipe tobacco smoke inhalation for 8 weeks; Ex + S, group which was subjected to exercise training and waterpipe tobacco smoke inhalation for 8 weeks. (0) No change, (1) minimum (focal myocytes damage), (2) mild (small multifocal degeneration with slight degree of inflammatory process), (3) moderate (extensive myofibrillar degeneration and/or diffuse inflammatory process), and (4) sever (necrosis with diffuse inflammatory process), *P < 0.05 vs. CTL.