A Comparative Study of the Performance Efficiency and Morphology of the Heart Among Long-Distance Runners

. The research aims to reveal the efficiency of the performance and morphology of the heart between long-distance 3000, 5000, and 10000 meters and comparison between the three events. The descriptive approach was used in a comparative speech style for its suitability for research, The research sample of (6) has been set up by (2) for each effectiveness representing Nineveh province of power games (Athletics) selected in the deliberately, The average lengths, weights, ages, and the training age were (172,368 - 2,871) cm and (64,894 - 3,094) kg and (21,052 - 1,025 ) year and (8,336 - 1,654) years, respectively, The measurements were taken for the efficient performance and heart morphology by using the echocardiography. The measurements were conducted under unified laboratory conditions for all sample members, the researcher used the measurements and information available as means and tools for data collection, and a group of medical and laboratory devices were used. The following variables were studied (EF, IVSd, LVIDd, LVIDs, LVM). According to the type of efficacy they had undertaken for each player it led to positive significance changes between an enemy (3000 m and 5000 m), resulting in positive significance changes in (IVSd, LVIDd, and LVM). While these programs did not lead to any significant change in the values of the rest of the variables. But between the two activities of the elements (3000 m and 10000 m) have resulted in positive significance changes in (IVSd, LVIDd, and LVIDs), while these programs have not made any significant change in the values of the rest of the variables. Among the effectiveness of an enemy (5000 m and 10000 m) variable (IVSd), these programs have no significant change in the remaining values of variables