Özet:

The purpose of the study was to determine which isotonic training programs (eccentric, stretch and shortening cycle (SSC), and concentric) could develop more explosive strength at the same time. In addition the effect of explosive strength on vertical jump performance was evaluated. 49 male high school students between the age of 14-16 years old, peticipated to our study who lived in Antalya. None of the subjects had previously undertaken any form of athletic training. Some motor tests were applied to the subjects before the exercise bout, for the determination of subjects’ performance. These subjects were put into four groups, three of them participated training program and the other group was a control group. Training programs continoued 8 weeks and the program was arranged as follofs;1.Group; Eccentric muscle training method, 2. Group, Concentric muscle training method, 3. Group; Stretch and Shortenıng Cycle muscle training method (SSC). 20 metres sprint test was as choosen an indicator of special speed. In this test deterioration were observed in the 95% meaningful level from the time point of view in all groups (P<0.05). SSC group showed maximum deterioration. The values best increase on vertical jump that were the indicator of explosive strength in sports, were observed in SSC group (P<0,05). Moreover all groups demonstrated development in 15 sn lasting mutiple vertical jump test value (p<0.005). However the best development was determined in SSC group (P<0,05). In addition, after the calculation of subject’s Anaerobic Power Capacities using by Lewis Protocol for which vertical jump values were taken into account, all of the groups display development. But the calculated values in the SSC group, were almost twice as much more than eccentric and concentric groups