Yazar "Yildirim, Ulas Can" seçeneğine göre listele

Listeleniyor 1 - 4 / 4
  • [ X ]
    Öğe
    Acute effect of different doses of caffeinated chewing gum on exercise performance in caffeine-habituated male soccer players
    (Frontiers Media Sa, 2023) Yildirim, Ulas Can; Akcay, Neslihan; Alexe, Dan Iulian; Esen, Ozcan; Gulu, Mehmet; Cirtita-Buzoianu, Cristina; Cinarli, Fahri Safa
    The ergogenic benefits of caffeine have been well established, but there is scarce research on its chewing gum form. The present research aimed to examine the effects of different doses (100 and 200 mg) of caffeinated chewing gum on muscle strength, vertical jump performance, and ball-kicking speed in trained male soccer players. In a double-blind, randomized counterbalanced, and crossover research design, 14 male soccer players (age = 22 +/- 2 y; body mass = 74.2 +/- 7.1 kg; height = 180.0 +/- 6.8 cm; habitual caffeine intake = 358.9 +/- 292.4 mg/day) participated in three experimental trials. In each trial, participants performed isometric handgrip strength, quadriceps and hamstring strength, ball-kicking speed, and 15 s countermovement jump test 10 min after chewing 100 mg (LCAF) or 200 mg (MCAF) of caffeinated gum or placebo (PLA). MCAF improved quadriceps strength (53.77 +/- 5.77 kg) compared to LCAF (49.62 +/- 8.81 kg, p = 0.048) and PLA (49.20 +/- 7.20 kg, p = 0.032). However, neither LCAF nor MCAF had a significant effect on the isometric handgrip and hamstring strength, ball-kicking speed, and 15 s countermovement jump test (all p > 0.05). These findings support chewing gum as an alternative mode of caffeine administration which can be used as a nutritional ergogenic aid for trained soccer players, at least for quadriceps strength.
  • [ X ]
    Öğe
    Combined but Not Isolated Ingestion of Caffeine and Taurine Improves Wingate Sprint Performance in Female Team-Sport Athletes Habituated to Caffeine
    (Mdpi, 2021) Karayigit, Raci; Naderi, Alireza; Saunders, Bryan; Forbes, Scott C.; Coso, Juan Del; Berjisian, Erfan; Yildirim, Ulas Can
    Previous studies have investigated caffeine (CAF) and taurine (TAU) in isolation and combined during exercise in males. However, the potential synergistic effect during high-intensity exercise remains unknown in female athletes. Seventeen female team-sport athletes participated (age: 23.4 +/- 2.1 years; height: 1.68 +/- 0.05 m; body mass: 59.5 +/- 2.2 kg). All participants were habitual caffeine consumers (340.1 +/- 28.6 mg/day). A double-blind randomized crossover design was used. Participants completed four experimental trials: (i) CAF and TAU (6 mg/kg body mass of CAF + 1 g of TAU), (ii) CAF alone; (iii) TAU alone; and (iv) placebo (PLA). Supplements were ingested 60 min before a 30-s Wingate Anaerobic Test (WAnT). Heart rate and blood lactate (BL) were measured before and immediately after the WAnT; and ratings of perceived exertion (RPE) were recorded immediately after the WAnT. Peak power (PP) was significantly higher following co-ingestion of CAF+TAU compared to PLA (p = 0.03) and TAU (p = 0.03). Mean power (MP) was significantly higher following co-ingestion of CAF+TAU compared to PLA (p = 0.01). No other differences were found between conditions for PP and MP (p > 0.05). There were also no observed differences in fatigue index (FI), BL; heart rate; and RPE between conditions (p > 0.05). In conclusion, compared to PLA the combined ingestion of 6 mg/kg of CAF and 1 g of TAU improved both PP and MP in female athletes habituated to caffeine; however; CAF and TAU independently failed to augment WAnT performance.
  • [ X ]
    Öğe
    Kafein ve Sportif Performans
    (Sakarya Uygulamali Bilimler Üniversitesi, 2023) Yildirim, Ulas Can
    Kahve, çay ve kakao gibi dogada bulunan bazi bitkilerin tohumlarinda, yapraklarinda ve meyvelerinde dogal olarak bulunan bir uyarici olan kafein, günümüzde bazi yiyecek ve içeceklerde ve bazi ilaçlarin içerigine de eklenerek tüketiciye sunulmaktadir. Dogrudan veya dolayli bir biçimde dünya genelinde her gün milyarlarca insan tarafindan tüketilen kafein, merkezi sinir sistemi ve diger sistemler üzerinde uyarici etkilere neden olmaktadir. Kafeinin birincil etki mekanizmasi adenozin reseptörlerini bloke etme yetenegidir. Yapi olarak adenozine çok benzemesi sebebi ile organizmayi kandirarak adenozin reseptörlerinde antagonist bir etki yaratmaktadir. Agri ve yorgunluk hissi ile alakali olan bu reseptörler g proteinleri ile gerekli baglantiyi kuramadigindan dolayi metabolizma agriyi ve yorgunlugu inhibe eder, böylece agri ve yorgunlugun ortaya çikisi gecikebilmektdir. Diger bir etkisi ise hormonal sisteme olmaktadir. Kafeinin alimi epinefrin ve norepinefrin gibi nörotransmitterlerin saliniminda artisa yol açar. Bu nörotransmitterler, bilissel islevi ve uyanikligi artirmada çok önemli bir rol oynamaktadir. Ayrica organizmanin agri kesicisi olarak da bilinen Beta Endorfin hormonunun saliniminda da kafein alimi ile artis ortaya çiktigi düsünülmektedir. Dahasi, glikoz ve yag asitleri gibi enerji substratlarinin mevcudiyetini artirdigi da bilinmektektedir. Bunlarin yanisira dolasim ve solunum sistemleri gibi diger fizyolojik sistemleri etkileyebilir ve dogru dozda tüketildiginde bazi potansiyel saglik faydalari olabilir. Ayrica isiri tüketim ve tolerasyon seviyesine bagli olarak elektroansefalografi (EEG) düzenini, duygulanimi ve uyku düzenini de degistirdigi, ayrica yine alim miktarina bagli olarak anksiyeteyi artirabildigi saptanmistir. Bahsi geçen mekanizmalar sayesinde kafeinin sportif performans üzerinde de çesitli etkileri olmaktadir. Arastirmalar, kafeinin glikojenin mobilizasyonunu ve yaglarin utilizasyonunu artirarak vücudun sinirli glikojen depolarini korudugu, böylece yorgunlugun baslangicini geciktirerek, egzersizin süresini artirdigini, güç ve kuvvet gibi performans parametrelerini etkiledigi söylemektedir. Sonuç olarak, kafein, birçok biyomotor özelligi gelistirerek, sportif performans üzerinde olumlu etkiler ortaya koyabilir. Bu literatür incelemesi kafeine genel bir bakisin yaninda, farkli parametreler üzerinde ne gibi etkileri meydana getirdigini tespit ederek sonuçlari okuyucular ile aktarmayi amaçlamistir.
  • [ X ]
    Öğe
    Placebo Caffeine in Soccer Players: Effects on Physiological Markers and Perceived Sleep Quality
    (Gumushane University, 2024) Güneser, Ezel; Akça, Firat; Yildirim, Ulas Can
    Not all questions regarding the physiological and psychological effects of caffeine have been answered yet. However, it is understood that athletes experience varying effects on physiological markers and sleep quality due to caffeine. This study aimed to examine the alterations in aerobic capacity and perceived sleep quality among football players when exposed to different doses of placebo gum. Twenty-two male players from an amateur football team (average age: 23,36 ± 5,4 years, height: 180,14 ± 6,9 cm; weight: 76,32 ± 10,2 kg; BMI: 23,51 ± 2,8 kg/ m2) participated voluntarily, and the study was designed as a randomized, crossover, single-blind trial. Following the ingestion of placebo gum for 5 minutes, the Yo-Yo Intermittent Recovery Test Level 1 (Yo-Yo IRT-1) was immediately conducted on the football players. Subsequently, participants were asked about the impact of the gum on their performance after each Yo-Yo IRT-1 trial. The morning after each testing day, the Richard-Campbell Sleep Questionnaire (RCSQ) and Karolinska Sleepiness Scale (KSS) were administered to all participants to assess potential changes in their sleep patterns. Ultimately, no significant differences were observed in aerobic capacity and sleep quality data when the placebo was utilized. Consequently, it can be concluded that placebo caffeine did not affect the perceived sleep quality or aerobic capacity among amateur football players.