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- MakaleYayıncıda açık erişim2026Scopus SJRQ1Effects of 8-week plyometric training program on balance, reaction time, and attention on elite adolescent female taekwondo athletes
Genç, Harun; Türkmen, Mustafa; Tekin, Irem; Cigerci, Ali Erdem; Gürses, Veli Volkan; Kizar, Oktay; Ökmen, Mehmet Serif; Polatcan, Ismail; Gündogdu, Serhat Dogu
Introduction: Taekwondo is a complex combat sport requiring high levels of strength, balance, reaction time, attention, agility, and endurance for effective performance under rapid offensive and defensive conditions. This study aimed to investigate the effects of an 8-week plyometric training program on static balance (SB), dynamic balance (DB), reaction time (RT), and attention (AT) in adolescent female taekwondo athletes. Methods: Twenty female athletes (age: 14.85 +/- 1.53 years; height: 162.27 +/- 7.12 cm; body mass: 56.69 +/- 6.45 kg) voluntarily participated in the study at Mardin Halit Demir Martial Arts Club. Participants were randomly assigned to either an experimental group (EG, n = 10) or a control group (CG, n = 10). The EG performed plyometric training twice weekly for 8 weeks in addition to regular taekwondo training, while the CG continued only taekwondo training. Static balance was defined as the primary outcome, whereas dynamic balance, reaction time, and attention were considered secondary outcomes. A 2 & times; 2 repeated-measures analysis of variance (group & times; time) was used to examine intervention effects. Results: Significant group & times; time interactions were observed for static balance and dynamic balance (p < 0.05), favoring the experimental group. However, no significant group & times; time interactions were found for reaction time or attention (p > 0.05). Discussion: These findings suggest that plyometric training may effectively improve balance performance in adolescent female taekwondo athletes, particularly static and dynamic balance. However, no significant effects were observed for reaction time or attention. Further studies with larger sample sizes are needed to clarify the potential effects of plyometric training on cognitive performance.
- MakaleYalnız künye2023Scopus SJRQ1Mathematical modeling of vibration failure caused by balancing effect in hydraulic turbines
Kahraman, Gökhan; Özdemir, Osman
This article discusses the causes of vibrations depending on unbalanced hydraulic forces in rotating and non-rotating equipment in hydraulic plants within the scope of vibration measurement standards. The radial and axial positions of the turbine shaft, normal operating conditions, the absolute vibration of the signal output velocity during startup and shutdown during unbalance condition of the turbine, the proximity probes have been measured by TMO 793 accelerometer sensor and TMO 793 velocity sensor. The results obtained from the monitoring are analyzed and the first discussion is over the comparison of the current operating levels and vibration standards. Secondly, the comparison is analyzed in order to examine the improvement in vibration level of the elimination of hydraulic imbalance more comprehensively, considering the stability of the hydro turbine-generator unit, a proportional row damping force, proportional-order oil-film force and a hydraulic force and by creating a new non-linear proportional-order mathematical model. Changes in vibration levels and spectral bands for failure types are stated as well. The solution of this integrated and accurate mathematical model shows that it is useful and concise in the diagnosis and prediction of faults in hydropower plants.
AtıfScopus13WoS13OpenAlex16
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