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The aim of this study was to evaluate the effects of a selected plyometric training program on the functional and structural changes in the heart after explosive exercise which is combined with a regular program in soccer. Thirty male college students, who voluntarily participated in this study, were randomly divided into experimental and control groups. The training program consisted of a selected plyometric exercise 3 days/week for 12 weeks. Some heart
characteristics were obtained and measured by using a non-invasive echocadiogram (one, two, dimensions). A significant increase was observed in the interseptal wall diameter (IVSS, and IVSD) and the posterior wall thickness
of the left ventricle of in systole and diastole (PWS and FWD) (P< O. 05,
P<0.01), (P<0.03 and P<0.002) in experimental group when compared with control group. In addition, and increase was also observed in some functional variables such as percentage of ejection fraction (%EF) (P<0.01) and the ratio of myocardial fiber shortening (FS, P<0.02) in experimental group when compared to control group. The finding of the present study suggests the heart,s hypertrophy in soccer players will improve multilaterally which is the dependant
and dominant metabolic system (anaerobic system by 80% and aerobic system
20%).