Effect of different rest interval between sets of resistance exercise on serum irisin and blood lactate levels in obese male children

  irisin is a new myokine that exerts its positive effects via increasing energy expenditure. However, irisin response to resistance exercise and its related training variables has been less discussed. The purpose of this study was to determine the effect of different rest interval between sets of resistance exercise on serum irisin and blood lactate levels in obese male children. Twelve obese male children (26.83±3.93 years) participated in the study. On 3 separate sessions of a resistance exercise protocol; subjects were randomly assigned to rest intervals of 60 seconds, 120 seconds, or 240 seconds between sets. Blood samples were collected before and immediately after exercise at each session. Statistical tests of paired t, ANOVA and Pearson’s correlation coefficient were used for data analysis. A significant increase was observed in the serum irisin and blood lactate immediately after three resistance exercise protocol; Also, there was significant difference in study variables in three resistance exercise protocol . Based on Turkey’s follow-up test increased serum irisin concentration and lactate at rest intervals of 60 seconds were significantly higher than rest intervals of 120 and 240 seconds; also, the increase of serum irisin concentration and lactate rest intervals of 120 seconds was significantly higher than of 240 seconds. In resistance training with low resting intervals more lactate will accumulate that may be one of the possible mechanisms of increment in irisin secretion after resistance activities with low resting intervals