Comparison of Speed and Strength Training to Maintain Hematological Factors and Vo2max of Male Athletes 13 to 15 Years

 The aim of the study was to determine the effects of two selected Training on blood hematological parameters and aerobic capacity in adolescent athletes. 

 in this study 45 young healthy athletes doing endurance exercises were assigned into three groups (group strength n=15, group velocity n=15 and control group n=15). Filed and laboratory test and blood samples were taken from each group at the beginning and end of training programs (eight-week resistance and sprint exercise training). The data analyzed by paired T test for within Groups and ANOVA for Between Groups. 

 The results showed that both sprint and strength training was able to maintain the achievements of endurance training. In addition, there were no significant differences in variables between group velocity and group strength. However, VO2max in control group significantly reduced in compared with group velocity (P=0.01) and group strength (P=0.001), and comparison between experimental groups, results showed that there were not found any significant differences between experimental groups. In addition, there were not significant changes between groups and within groups on indicators of Hematology. 

 In conclusion of this study can be noted that after endurance training and achieve the desired level of cardiovascular fitness, instead of time consuming and boring endurance training, particular form of sprint and strength training can be used to maintain the achievements of endurance exercise.