INTRODUCTION: The elite children athletes are one who has superior athletic talent. Monofin (a single surface swim fin) swimming already proved to be the most efficient method of swimming for human being (1). Little is known about the influence of child monofin training on cardiac adaptation following long - term monofin training (LTMT). METHODS: 14 elite monofin children aged 11.95 years (± 1.09 yr) , height (Ht) (153.07 ± 4.2 cm ) , weight (wt) ( 52.4 ± 3.7 kg ), took part in ( LTMT ) for 36 weeks , 6 session per week , 90 min per session . All subjects under went two-dimension, M-mode, and Doppler echocardiography before and after (LTMT) to evaluate cardiac dimensions and function; septal and posterior wall thickness. Statistical methods of SPSS, means ± SD and paired t test, percentage of improvement were used. RESULTS: There was significant difference (P<0.01) and percentage improvement for all echocardiographyparameter after (LTMT). Inter ventricular septal thickness in diastole (IVSd) and in systole (Ivss) increased by 27.9 % and 42.75 %. Left ventricular end systolic dimension (lvesd) and diastole (lvedd) increased by 16.81 % and 42.7 % respectively. Posterior wall thickness in systole (pwts) increased very highly by 283.3 %, and in diastole (pwtd) increased by 51.78 %. Left ventricular mass in diastole (Lvd mass) and in systole (Lvs mass) increased by 44.8 % and 40.1 % respectively. Stroke volume (sv)increased by 25% and resting heart rate (HR)improved and decreased by 14.7%. DISCUSSION: Monofin training is an effective sport to enhance "Heart athletes" for children, because the unique swim fin tool creates propulsion and over come resistance. Further researches are needed to determine the effects of monofin training on right ventricular in children athletes . Key Words: Monofin Training; Heart athlete`s, Elite child athlete, Echocardiography REFERENCE 1. Abouzeid Magdy (2008). Cardiopulmonary Adaptation in Elite children following long-term Monofin training. Bulletin No. 54, sep. 2008 ICSSPE, Berlin, Germany.
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