AIM: To analyze the effect of aerobic exercise on the cardiac function of juvenile with simple obesity, and to provide scientific basis for correct sports in juvenile with simple obesity. METHODS: (1) Totally 60 male students, who were diagnosed as having simple obesity by Lingmucilang standard, were selected randomly from higher class of three elementary schools of Xi'an City in September 2006, aged 12.46 +/- 0.40 years, with the height of 158.67 +/- 3.03 cm and body mass of 70.43 +/- 3.89 kg and body fat rate of 56.29% +/- 2.98. They were divided into two groups randomly: aerobic exercise group (n = 30) and jogging group (n = 30). (2) concrete exercise prescription: the students in the aerobic exercise group received aerobic exercise (grade two in juniors) for 10 weeks, taking time exercise being on Monday, Wednesday and Friday from 9:00 to 10:30. The motion intensity was 55% to 65% of maximal heart rate, once 50 to 60 minutes. Those in the jogging group received jogging for 10 weeks, taking time exercise being on Tuesday, Thursday and Saturday from 16:00 to 17:30. The motion intensity was 55% to 65% of maximal heart rate, once 50 to 60 minutes. Food and drink were appropriately controlled and energy balance was kept between income and expenditure and sufficient and reasonableness nutrition was supplemented. (3) Each index was measured in systolic time interval under resting state before exercise and 10 weeks after exercise in the two groups by cardiac function comprehensive meter. RESULTS: Totally 60 subjects were involved in the result analysis. (1) The heart rate was lower after exercise than that before exercise. Cardiac cycle, left ventricular ejection time (LVET), pre-ejection phase (PEP), isovolumic contraction period (ICP), mechanical systolic time (MST), electromechanical delay time (EDT), electromechanical systolic time (EST), hemiwave time (HWT), pulse wave transit time (PWTT), Q-U, PEP/LVET and Q-U/LVET were higher than that before exercise. There were significant differences (p < 0.05). (2) LVET, PEP, ICP, MST, EST and Q-U/LVET in the aerobic exercise group were higher than that in the jogging group. There were significant differences (p < 0.05). CONCLUSION: (1) Aerobic exercise is effective for improving cardiac function of juvenile with simple obesity. (2) Compared with jogging, aerobic exercise can greatly affect the index of cardiac systolic time interval and can effectively improve the cardiac function of juvenile with simple obesity.

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