IRCT201603039460N2 IRCT 2016-03-31 Shahid beheshti university comparing effect of traditional continuous training and high intensity interval training on cardiac morphology and function comparing effect of traditional continuous training and high intensity interval training on cardiac hypertrophic indexes, PI3k gene expression and cardiac function 2014-09-21 anticipated 36 Complete https://irct.ir/trial/9989 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Parallel, Purpose: Prevention, Other design features: we use random numbers table to assigning subjects into three groups randomly. N/A healthy subjects which participate in physical activity. Intervention 1: Intervention 1: HIT group Exercises included warm up, HIT training, cool down. Subjects warmed up by stretching and easy walking for 5 minutes. The HIT interventions consisted of four 30 s maximal effort (“all-out”) shuttle run bouts (from cone-1 to cone-2 ,20 meter sweep) separated by 1.5 min passive rest each . HIT protocol began with 4 cycles/session and every two weeks added one cycle. Finally it was 8 cycles/session in tenth week that lasted 16 minutes. Cooling Down also included 5 min of walking and stretching. During the HIT interventions all subjects were vocally encouraged to maintain Maximal effort. Intervention 2: Intervention 2: consists of 20 minutes of running continuously at heart rate of approximately 140 continuously that started three sessions per week for fourth weeks and gradually increased in tenth week to 40 minutes. Intervention 3: control: Control group asked to be sedentary in this period.