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After the scientific studies about the negative effect of static stretching on vertical jumping performance, it was observed that coaches did not use static stretching exercises in athletic warming protocols. This study was conducted to find out the acute effect of static streching performed at different knee angles and durations on vertical jump performance. 19 male football players playing in Cukurova University Sports Club participated in this study voluntarily. Vertical jumps of the participants were applied at two different knee angles (1500-1300) and durations (0s-15s-30s-45s). Measurements were performed in two days. At 1500 (first day) and 1300 knee angle (second day), static stretching and vertical stretching were made for 4 different durations (0s-15s-30s-45s). After each jump, rest time equal to stretching time was given. While vertical jump measurements of participants were made with Takei brand jump meter, knee angles measurements of participants were performed with baseline brand plastic goniometer (30cm). Statistical analyses were carried out using SPSS 21 package program. Shapiro-Wilk test was conducted for normality distribution of the data. It was found that only static stretching values of 45 sec did not show normal distribution (p = 0,046). For this reason, Wilcoxon Test and Mann Whitney U Test were used for nonparametric tests. For paramaters which were normally distributed, paired t-test and independent t-test were performed. Vertical jump after static stretching (45s) was found to be higher than baseline jump (0s) measurements only at 130 degree knee angles of the participants (p=0.04). However, at the same knee angle, 15 seconds of static stretching had a negative effect on the vertical jump (p = 0.05). There was no significant difference between the other measures (p> 0.05). As a result; it can be emphasized that static stretching exercise which is done at a certain angle of knee and duration in warm-up may not create a negative impact on vertical jump performance.
After the scientific studies about the negative effect of static stretching on vertical jumping performance, it was observed that coaches did not use static stretching exercises in athletic warming protocols. This study was conducted to find out the acute effect of static streching performed at different knee angles and durations on vertical jump performance. 19 male football players playing in Cukurova University Sports Club participated in this study voluntarily. Vertical jumps of the participants were applied at two different knee angles (1500-1300) and durations (0s-15s-30s-45s). Measurements were performed in two days. At 1500 (first day) and 1300 knee angle (second day), static stretching and vertical stretching were made for 4 different durations (0s-15s-30s-45s). After each jump, rest time equal to stretching time was given. While vertical jump measurements of participants were made with Takei brand jump meter, knee angles measurements of participants were performed with baseline brand plastic goniometer (30cm). Statistical analyses were carried out using SPSS 21 package program. Shapiro-Wilk test was conducted for normality distribution of the data. It was found that only static stretching values of 45 sec did not show normal distribution (p = 0,046). For this reason, Wilcoxon Test and Mann Whitney U Test were used for nonparametric tests. For parameters which were normally distributed, paired t-test and independent t-test were performed. Vertical jump after static stretching (45s) was found to be higher than baseline jump (0s) measurements only at 130 degree knee angles of the participants (p=0.04). However, at the same knee angle, 15 seconds of static stretching had a negative effect on the vertical jump (p = 0.05). There was no significant difference between the other measures (p> 0.05). As a result; it can be emphasized that static stretching exercise which is done at a certain angle of the knee and duration in warm-up may not create a negative impact on vertical jump performance.
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