Browsing by Author "Selcuk, Muzaffer"

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The Acute Effects of Simulated Hypoxic Training at Different Altitudes on Oxidative Stress and Muscle Damage in Elite Long-Distance Runners
(Peerj inc, 2025) Sarikaya, Muecahit; Oge, Beyza; Embiyaoglu, Nuri Mert; Selcuk, Muzaffer; Cinar, Vedat; Oner, Salih; Batrakoulis, Alexios
Background Understanding the impact of altitude on muscle damage and oxidative stress is essential for optimizing training and recovery strategies for athletes exposed to high-altitude conditions. Therefore, this study aimed to investigate the effects of acute exercise at different altitudes on oxidative stress and muscle damage. Methods A total of twelve elite long-distance runners (mean age: 20.3 +/- 1.5 years) from different branches participated in the study. The exercise protocol was the Bruce submaximal treadmill exercise test, which was conducted under three simulated hypoxic conditions (at 1,700 m, 2,450 m, and 3,200 m) and one normoxic condition (sea level). All measurements took place at the same time of the day. After the exercise protocol, 5 ml venous blood samples were taken from the participants, while heart rate and oxygen saturation were monitored at the 3rd, 6th, 9th, and 12th minutes during the exercise. Results Significant altitude-dependent variations were observed in oxidative stress markers, with total oxidant status (TOS) (p = 0.017) and malondialdehyde (MDA) (p < 0.001) levels increasing at higher altitudes, while total antioxidant status (TAS) (p < 0.001) exhibited an elevation and oxidative stress index (OSI) (p < 0.001) demonstrated a decline as altitude increased. However, no significant difference was found in creatine kinase (CK, p = 0.059) levels. Additionally, there were significant differences in the oxygen saturation measurement taken at the 3rd (p < 0.001), 6th (p < 0.001), 9th (p < 0.001), and 12th (p < 0.001), minutes following the exercise session. There was no difference in the pulse measurement taken at the 3rd and 12th minutes, but a difference was observed at the 6th and 9th minutes post-exercise (p < 0.01). Conclusions In conclusion, the study determined that endurance exercises performed under simulated normobaric hypoxia at different altitudes increased TAS and reduced OSI in elite long-distance runners. The increase in TAS and the reduction in OSI were more pronounced at higher altitudes, particularly at 2,450 m and 3,200 m, compared to sea level. These findings highlight the need for altitude-specific training and recovery strategies to minimize oxidative stress and muscle damage in athletes.
Determining the Effect of Preparation Period Trainings on the Physical Parameters of Tennis Players
(Ejmanager Llc, 2023) Selcuk, Muzaffer
This research was carried out to determine the effects of tennis training applied during the preparation period on some physical parameters of the athletes. The research group consists of 24 male volunteer athletes licensed in the tennis branch. Athletes in the research group were trained for endurance and tennis, three days a week and 85 minutes a day for eight weeks. Height, body weight, leg strength, hand grip strength, vertical jump, speed, flexibility and agility values were measured for the research group at the beginning and end of the training. SPSS statistical package program was used in the analysis of the data. Significance was accepted as p>0.05. As a result of the research, tennis players; It was determined that there was a statistically significant difference between the leg strength, hand grip strength, vertical jump, flexibility, agility, ten and thirty meters values (p<0.05). As a result, it has been seen that regular and planned tennis and endurance trainings during the preparation period affect the physical parameters of the athletes positively. In this context, it is thought that if the trainings to be applied at early ages are designed considering the physical characteristics of the athletes, they will positively affect the performance of the athletes.