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Öğe The Design of Fatigue Test Machine and the Analysis of Fatigue Behavior of FSWed Dissimilar Aluminum Alloys(Springer, 2022) Yuruk, A.; Ceylan, Bayram; Kahraman, N.Aluminum alloys have low density and high yield strength, thus leading them to be commonly used in aircrafts, sea vessels and land vehicles to acquire light weight and their use in these industries has been increasing every passing day. It is necessary to assemble many dissimilar aluminum alloys in such a way that they fit one another in the application. However, the parts made of these alloys are exposed to very different stresses (tensile, bending, impact, etc.) and fatigue occurs in the parts working especially under dynamic loads by causing structural damage. In this study, a computer-based fatigue test machine was designed and manufactured in order to do the fatigue tests for plate-type materials. This machine was used for the fatigue tests of dissimilar aluminum alloys (AA5754/AA6013) welded by the friction stir welding (FSW). FSW was carried out at 12.5, 25, and 32 mm/min welding feed rates and 1250 rpm. In addition, metallographic examinations and hardness tests were carried out to determine macrostructural and microstructural properties of weld zones and the effects of the joints on fatigue strength. The findings of the tests were evaluated and interpreted. The new machine successfully tested the fatigue of the FSWed samples. It was determined that in FSW, welding feed rate and material type were effective on the heat input, microstructure, hardness distribution of the weld zone and fatigue strength and life of the joints.Öğe Effect of different work-to-rest ratios on physiological and perceptual responses to kickboxing specific high intensity intermittent exercise in elite male kickboxers(Univ Leon, Fac Ciencias Actividad Fisica & Deporte, 2025) Ceylan, Bayram; Ozturk, Furkan; Taskin, Hasan Basri; Ouergui, Ibrahim; Baydil, BilgehanThis study examined how different rest periods during high-intensity, intermittent kickboxing exercise affect physiological and perceptual responses in nine elite kickboxers. After being informed about the nature of the study, the athletes performed three exercise sessions consisting of kicks and punches with 1:1, 1:2 and 1:3 work-to-rest ratios in a randomised order, with 48 hours between each session. Their heart rate (HR) was measured at rest, immediately after, and six minutes after each exercise protocol. The athletes performed a countermovement jump (CMJ) test before and after exercise. Rating of perceived exertion (RPE) and muscle soreness (PMS) were measured immediately after exercise. The number of kicks and punches performed by the athletes was recorded. Different rest ratios did not affect heart rate (F2, 14 = 1.08, p = 0.36). There was no difference in the number of kicks or punches performed by the athletes among different rest intervals (F2, 16 = 1.59, p = 0.24; F2, 16 = 1.70, p = 0.21). Exercises with different rest periods did not induce changes in CMJ (F2,16 = 0.69, p = 0.52). While the PMS responses of the athletes did not differ among the different rest intervals (F2,16 = 1.27, p = 0.31), the RPE values did differ among the exercises with the different rest intervals (F2, 16 = 3.70, p = 0.04). The athletes presented higher RPE values with the 1:1 interval than with the 1:2 and 1:3 intervals (p < 0.05). Kickboxing-specific HIIE with different rest intervals did not induce any physiological or performance differences, but led to a higher RPE following a short rest interval than a long one. These findings highlight that perceived difficulty (i.e. RPE) increases as the rest period shortens. Thus, there is a need to optimise HIIE protocols for targeted results and subjective recovery needs in this sport.Öğe Golden score period in high-level judo competitions: the effect of the scores and penalties at the real contest time(Routledge Journals, Taylor & Francis Ltd, 2025) Ceylan, Bayram; Ozturk, Furkan; Taskin, Hasan Basri; Balci, Sukru SerdarThis study investigated the effect of scores and penalties in real contest time on the contest results in the golden score period. Of 6872 official contests at 10 different high-level competitions, 1414 contests with a golden score (21%) were included. Analyses for sex, weight category and rounds were performed with total match duration. Scores and penalties were recorded separately for real contest time and golden score period. Mutual waza-ari at real time (first 4 min) caused the high rate of matches ending with a score (p < 0.05). The rate of receiving a shido was higher among defeated athletes during the real contest time (p < 0.05). The rate of winning a contest with score during the golden score period was lower than winning a contest with hansoku-make in heavyweight categories. The contests more likely ended with scores and less likely ended with hansoku-make for men than women (p < 0.05). The results showed that the way the contest ended was different between sexes and among weight categories during the golden score period. Receiving a shido during the real contest time can lead to defeat in the golden score, thus athletes should be careful of presenting active judo and refraining from any action leading to penalties.Öğe Hypohydration is evident in elite orienteering athletes during a two-day race: a descriptive study(Bmc, 2025) Kerem, Mustafa; Oeztuerk, Furkan; Taskin, Hasan Basri; Dudak, Ercan; Ceylan, BayramThis study aimed to present changes in hydration status of orienteering athletes during a two-day race. Twenty elite male orienteers voluntarily participated in the study during a two-day race. Athletes' hydration status was measured two consecutive race days via urine specific gravity (USG) and fluid consumption was followed. There was a significant main effect of time on USG values (F2.32-20.89=3.70, p = 0.04, eta 2 = 0.29, ES = Large). USG values increased from the day one morning (1.019 +/- 0.008) to post-race on day two (1.026 +/- 0.003) (p = 0.04), from 3 h post-race on day one (1.018 +/- 0.007) to post-race on day two (1.026 +/- 0.003) (p = 0.01) and pre (1.019 +/- 0.004) to post-race (1.026 +/- 0.003) on day two (p = 0.001). Both races worsened hydration level of the athletes and they could not rehydrate post-race on day two despite fluid intake ad libitum. These findings suggest that orienteering athletes presented hypohydration following consecutive races as suggested by USG values on day two. Therefore, specific rehydration plan could be developed and applied for proper hydration status in these athletes.Clinical trial number: Clinical trial number is not applicable for this study.Öğe Impact of time-of-day on judo-specific performance(Univ Leon, Fac Ciencias Actividad Fisica & Deporte, 2022) Öztürk, Furkan; Ceylan, Bayram; Balcı, Şükrü SerdarIn judo tournaments, matches for each weight category are held on the same day and athletes competing at the finals have to compete at different times of the day. This study aimed to investigate the effect of time-of-day on judo specific performance and the changes in physiological load following judo specific performance. Fourteen male judo athletes (age 19.1 +/- 1.4 years) voluntarily participated in the study. At the 1st visit, anthropometrical measurements and familiarization procedures were conducted and the athletes' chronotype was determined. Athletes performed the Special Judo Fitness Test (SJFT) during 2nd and 3rd visits. Athletes randomly performed two consecutive SIFTs with 15 min intervals at 10:00h, which is the official start time of matches, and at 18:00h which is the time when the finals start. During SJFT applications, athletes heart rate (HR), blood lactate (bLA), body temperature and rate of perceived exertion (RPE) were monitored. The changes in total throw numbers (F-1,F-13= 1.32, p=0.27) and SJFT index (F-1,F-13= 0.30, p=0.59) were not different between morning and evening. There were similar changes in bLA (F-4,F-52=0.66, p=0.63), RPE (F-1,F-13=1.42, p=0.26) and body temperature (F-1.4,F-18.0=1.18, p=0.31) which were measured before and after the tests. However, HR measured in the evening were higher compared to morning measurement at all measurement times (F-1,F-13=10.28, p=0.01), but there was no difference in SJFT throws (F-3.8,F- 48.8=0.49, p=0.74). In conclusion, different times of the day did not affect judo specific performance as well as physiological variables in judo athletes.Öğe Intermittent ne-waza exercise leads to greater effort in uke compared to tori in prepubescent judo athletes(Univ Leon, Fac Ciencias Actividad Fisica & Deporte, 2025) Ceylan, Bayram; Ozturk, Furkan; Taskin, Hasan Basri; Sarikaya, Ugur; Balci, Sukru SerdarThis study investigated physiological and perceptual responses between uke (the athlete receiving a technique) and tori (the athlete executing a technique) during intermittent osaekomi-waza exercises in prepubescent judo athletes. Fifteen child judo athletes (age: 10.8 +/- 1.1 years) participated voluntarily. In this cross-over design with randomization (except for the first visit), athletes completed three sessions: anthropometric measurements and familiarization, followed by intermittent osaekomi-waza exercises as both uke and tori. The exercise protocol consisted of four sets of 20-second intermittent osaekomi-waza using kesa-gatame, interspersed with 10-second rest intervals (1:1/2 work-to-rest ratio), performed on separate days. Heart rate (HR) was measured at rest, immediately after exercise, and one minute after exercise. The rating of perceived exertion (RPE) was assessed using a 0-10 scale immediately after each exercise bout. While a two-way repeated measures ANOVA indicated a statistically significant main effect of role on HR, with higher values in the uke role compared to the tori role across all measurement times, Bayesian analysis did not provide substantial evidence supporting this role effect. Athletes also reported significantly higher RPE scores in the uke role than in the tori role, indicating greater perceptual demands in prepubescent judo athletes, despite similar heart rate patterns between roles.Öğe Ulusal ve Uluslararası Türk Judocularda Elpençe Kuvveti(Düzce Üniversitesi, 2022) Ceylan, Bayram; Öztürk, FurkanBu çalışmanın amacı uluslararası ve ulusal seviyedeki judocuların maksimal el pençe kuvvetini belirlemek ve karşılaştırmaktır. Çalışmaya 18 uluslararası ve 16 ulusal seviyede erkek sporcu gönüllü olarak katıldı. Antropometrik ölçümler sonrasında sporcular 1 dakika ara ile her el için rastgele 3 kez maksimal el pençe kuvvet testini gerçekleştirdi. Grupların performanslarını karşılaştırmak için bağımsız örneklemlerde T test kullanılırken, değişkenler arasındaki ilişkiyi belirlemek için Pearson korelasyon testi kullanıldı. Analamlılık düzeyi p lt;0,05 olarak kabul edildi. Gruplar arasında vücut ağırlığı, boy, vücut kütle indeksi, sağ, sol ve toplam rölatif el pençe kuvvetinde anlamlı farklılık tespit edildi (p lt;0,05). değişkenler arasındaki ilişki incelendiğinde, vücut ağırlığı ve vücut kütle indeksi ile maksimal el pençe kuvveti arasında anlamlı ilişki tespit edildi (p=0,00). Sınıflandırma tablosu ile değerlendirildiğinde, sporcuların çoğu sağ mutlak ve rölatif, sol mutlak ve rölatif ve toplam mutlak ve rölatif el pençe kuvvetinde sıradan olarak sınıflandırıldı. Rölatif el pençe kuvveti düşünüldüğünde, uluslararası seviyedeki sporcular ulusal seviyedeki sporculardan daha iyi performans ortaya koydu, ancak ulusal seviyedeki sporcular rölatif performansta daha iyi sonuçlar ortaya koymuştur
