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    Acute Effects of Self-Myofascial Release Through Foam Roller and Static Stretching Methods on Vertical Jump Performance of Taekwondo Players
    (Researchtrentz Acad Publ Education Services, 2022) Akarsu, Mehmet; Kurhan, Cihad Onur; Ilbak, Ismail; Altuntop, Recep; Gonc, Mesut; Stojanovic, Stefan; Purenovic-Ivanovic, Tijana
    The objective of this research is to examine the acute effects of self-myofascial release through foam roller and static stretching methods on the vertical jump performance of taekwondo players. In this cross-sectional study, a randomized controlled experimental method, one of the quantitative research models, was used. 21 taekwondo players participated in this research voluntarily. The mean age of the participants was 15.95 +/-,865; the mean height was 172.90 +/- 3,846 and the mean body weight was 61,86 +/- 5,379. On the first day of the study, low-paced jogging was performed for 5 minutes at a heart rate of 120 (RS V800) and then their vertical jump performance was measured. On the second day of the research, low-paced jogging was performed for 5 minutes, and then a static stretching protocol was applied to taekwondo players, and then their vertical jump performance was measured. On the third day of the research, low-paced jogging was performed for 5 minutes and then self-myofascial release through foam roller protocol was applied to taekwondo players and then their vertical jump performances were measured. As a result of the research, it was determined that there was no statistical difference between 5 minutes of jogging at a slow pace and static stretching. However, it was determined that there were statistically significant differences both between 5 minutes of jogging at a slow pace and self-myofascial release and between static stretching and self-myofascial release (p<0.05). In conclusion, it can be said that self-myofascial release through foam roller exercises can affect vertical jump performance positively and at an acute level.
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    The Effects of Different Stretching Techniques Used in Warm-Up on the Triggering of Post-Activation Performance Enhancement in Soccer Players
    (Mdpi, 2024) Kurak, Kemal; Ilbak, Ismail; Stojanovic, Stefan; Bayer, Ramazan; Purenovic-Ivanovic, Tijana; Palka, Tomasz; Ambrozy, Tadeusz
    The aim of this research was to investigate the effects of different stretching techniques used during warm-up exercises prior to post-activation performance enhancement (PAPE) on the explosive lower extremity strength performance of soccer players. This cross-sectional study involved the participation of 13 male soccer players with an average age of 22.38 +/- 1.75, body height of 174.38 +/- 3.94, and body mass of 72.30 +/- 4.13. To determine the participants' maximal strength performance, one repeated maximal strength (1-RM) squat exercise was applied. The PAPE protocol was then implemented with a squat exercise consisting of three repetitions at 80% of 1-RM. The warm-up protocols consisted of 5 min of cycling, followed by dynamic stretching, static stretching, or proprioceptive neuromuscular facilitation (PNF) stretching exercises. These protocols were applied on four different days with a 72 h interval. A vertical jump test was conducted to measure the participants' explosive strength performance. The research data were analyzed using IBM Statistics (SPSS version 26.0, Armonk, NY, USA) software. The findings of this study revealed statistically significant differences in vertical jump performance values after PAPE among participants based on the different stretching techniques used during warm-up (p = 0.00). In this context, the research concluded that dynamic stretching is the optimal stretching technique during warm-up exercises before PAPE to maximize its effects. On the other hand, static stretching was found to negatively affect performance by absorbing the PAPE effect.
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    Hip and shoulder flexibility in novice rhythmic gymnasts and age-matched controls: Inter-limb asymmetry
    (Romanian Assoc Balneology, 2024) Purenovic-Ivanovic, Tijana; Sterkowicz-Przybycien, Katarzyna; Dosic, Andela; Stojanovic, Stefan; Ilbak, Ismail
    Rhythmic gymnastics is a sport of asymmetry and lateral preferences, so the main objective of this study was to examine and compare hip and shoulder range of motion (ROM) and inter-limb asymmetry in 44 rhythmic gymnasts (RGs) and 51 age-matched non-athletes (NAs), i.e. controls. The baseline characteristics of 95 female participants, divided into two age- group categories (U8: 6-8 years, N=36; U11: 8-11 years, N=59) were established, as well as their hip (right/left hip flexion, right/left hip extension, right/left hip abduction, in degrees) and shoulder ROM (right/left shoulder flexion, right/left shoulder extension, in degrees), and asymmetry index (ASI, in %) was calculated. Significant differences between RGs and NAs were established (the exception is hip and shoulder extension in U8s, p>0.05), with greater ROM values recorded in RGs. Significant age differences were recorded among RGs in hip flexion and left hip abduction (p<0.05), in favor of U11s, and within NAs only in the case of right hip flexion (p=0.017), but in favor of U8s. The presence of asymmetries (ASI>15%), as well as its absence, is established in both RGs and NAs, but statistically significant side-to-side differences were recorded in U8 NAs (shoulder flexion, p=0.044) and U11 NAs (shoulder extension, p=0.057).