The acute effect of posactivation potantion on vertical jump and sprint performance

This study has been carried out in order to investigate the impact of postactivation potential on speed, squat take off, and vertical take off performances. To this aim, 25 male athletes playing basketball in Bursa in the 1st and 2nd Leagues, whose average of age is 18.45±2.63 years, average of height is 195.8±6.92, and average of body weight is 91.45±8.33 are used as test subjects.At the beginning of the research, all of the athletes went through physical tests. Then, heights and weights of the group of 25 people that will attend the research were determined. Maximal squat values of each subject that will attend the research were determined 2 days prior to the tests and the values of 90%, 85%, %80, 75%, 70% have been calculated. One day prior to the pre-loading to the subjects, take off and speed tests were carried out without preloading.After general warm-up, squat preloading was applied to the subjects and immediately after that, vertical take off, squat take off, and 30m speed tests were carried out respectively. Only one preloading was carried out on the same day, and each preloading was done on the days that are not successive.It has been detected according to the vertical take off performances of the subjects that they took off 52,09 ± 7,21 cm as a result of the protocol without preloading, 55,51 ± 9,79 cm as a result of 90% loading, 55,62 ± 9,13 cm as a result of 85% loading, 52,63 ± 8,10 cm as a result of 80% loading, 52,06 ± 8,11 cm as a result of 75% loading, 51,92 ± 7,75 cm as a result of 70% loading.It has been detected according to the squat take off performance properties of the subjects that they took off 42,28 ± 7,52 cm as a result of the protocol without preloading, 43,81 ± 8,30 (25-58) cm as a result of 90% loading, 44,21 ± 8,22 cm as a result of 85% loading, 42,92 ± 7,52 (27-56) cm as a result of 80% loading, 42,23 ± 7,39 cm as a result of 75% loading, 42,39 ± 7,45 cm a result of 70% loading.It has been detected according to the speed performances of the subjects that they ran for 4,22 ± 0,08 sec as a result of the protocol without preloading, 4,15 ± 0,07 sec as a result of 90% loading, 4,16 ± 0,08 sec as a result of 85% loading, 4,18 ± 0,07 sec as a result of 80% loading, 4,22 ± 0,07 sec as a result of 75% loading, 4,23 ± 0,05 sec a result of 70% loading.Impacts of loading methods that were applied in different intensities on vertical take off performance have been analysed according to ANOVA statistics and as a result of the analysis, it has been discovered that the applied loading methods have significant difference on vertical take off performance (F = 11.081; p<0.003). According to the LSD test, a statistical difference was detected between protocol without preloading and 90% loading protocol and 85% loading protocol in vertical take off performances. (p<0.001).Impacts of loading methods that were applied in different intensities on squat take off performance have been analysed in repetitive measurements according to ANOVA statistics and as a result of the Analysis, it has been discovered that the applied loading methods have a significant difference on squat take off performance (F = 14.069; p<0.001). While statistical difference was detected between protocol without preloading and 90% loading protocol and 85% loading protocol in squat take off performances according to LSD test, no statistical difference was detected between other loadings.Impacts of loading methods that were applied in different intensities on speed performance have been analysed in repetitive measurements according to ANOVA statistics and as a result of the Analysis, it has been discovered that the applied loading methods have a significant difference on speed performance (F = 13.526; p<0.001). While statistical difference was detected between protocol without preloading and 90, 85, and 80% loading protocols according to LSD test (p<0.01, p<0.01 ve p<0.01 respectively), no statistical difference was detected between other loadings.A significant increase was observed in the take off performances of the athletes between 90% and 85% range, and in the speed performances between 90% and 80% range.As a result, it has been concluded that take off and speed performances that have a crucial role in the increase of the performance and efficiency of the athlete by postactivation potential.