درخت حوزه‌های تخصصی

Background: Fatigue as one of the physiological factors can affect the physical performance of athletes. This issue is more important in young athletes and can expose them to injury. Aim: The purpose of this research was to investigate the effect of functional fatigue on the performance and landing mechanics of adolescence taekwondo athletes. Materials and Methods: This was a semi-experimental study. Participants were 20 male teenage taekwondo players. Pre-fatigue measurements included side-jump tests, figure-8 hop tests, and single-leg triple jump tests, as well as a lower limb biomechanics assessment using a landing error scoring system. After the functional fatigue protocol was applied, all the pre-fatigue variables were evaluated again. In order to examine the intra-group changes of the research variables in the pre and post-test stages, the paired t-test at a significance level of P≤0.05 was used. Results: The paired-t test results revealed that following fatigue induction, performance in the side-jump and figure-8 hop tests significantly deteriorated (P<0.05). Additionally, performance in the single-leg triple hop test declined (P<0.05). Moreover, landing error significantly increased (P<0.05). Conclusion: The finding of this study indicated that after applying fatigue, the subjects' performance decreased and the biomechanical error of the lower limbs increased. Fatigue can significantly impact adolescent taekwondo athletes' performance and biomechanics. So, taekwondo coaches should implement effective strategies to mitigate fatigue, enhance athletes' conditioning, and optimize their performance in training and competitions.

The study aimed to examine the gender-adjusted impact of personality factors on the motivations of e-sports participants. Descriptive research was conducted using structural equation modeling. The sample consisted of 763 individuals (599 men and 164 women) selected through simple random sampling, with statistical power set at 80% and a significance level of 0.01. The research variables, including participation structure and personality traits, were measured using the NEO Five-Factor Inventory (NEO-FFI) short-form questionnaire (Gassling et al., 2003) and the Motivational Participation Questionnaire` of Cianfrone et al. (2011). The findings supported all research hypotheses regarding the personality traits and motivations of e-sports players, even after adjusting for gender. The results indicated that brunerism, consensus, duty, psychology, and acceptance of experience were significant motivators for e-sports players, and the gender-adjusted analysis confirmed the research hypotheses in both male and female groups. Therefore, considering the personalities of e-sports players in sports marketing can enhance their engagement, as their motivations to participate are influenced by their traits.