الملخص الإنجليزي
The purpose of this study is to compare the acute effect of two types of stretching during warm-up on repeated shuttle-sprints and jump performances in female basketball players. On three occasions, each separated by 72 hours, fourteen female basketball players (age 16.4+3.0, training years 3+2, height 163.6+4.9 cm and weight 51.148.9 kg) performed 8 minutes of standardized warm-up followed by one of the 3 different stretching conditions: no stretching (NS) as the reference, static stretching (SS), or dynamic stretching (DS) in a counter balanced randomized manner. After each stretching condition, subjects were given 2 minutes of passive recovery before performing repeated shuttle-sprints and jump test (RSSJ). The following variables were calculated: total time (TT), best time (BT) and sprint fatigue index (SFI), mean jump height (MJ), total jump height (TJ), best jump (BJ) and jump fatigue index (JFI). One way ANOVA for repeated measures and LSD post hoc results showed significant differences in TT performances after SS compared to both the performances after NS and DS (p=0.006; ES=0.54 and p=0.03; EŞ=0.3, respectively). On the contrary, MJ performances showed significant differences after DS compared to both the performances after NS and SS (p=0.001; ES=0.33 and p=0.09; ES=0.19, respectively).Conclusion: DS has no effect on repeated shuttle-sprint performances but it is better (quicker time) compared to SS, whereas in CMJ performances, DS has negative effect (lower jump) compared to SS that has no effect on CMJ performances. In light of the findings, the researcher recommends that basketball coaches and players should favor dynamic stretching over static stretching in warm-ups before training or competing basketball or any other activity, that includes explosiveness or high speeds, taking into consideration that, excessive volume of dynamic stretching may induce fatigue and effect jumping ability immediately after a shuttle-sprint.
