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    Öğe
    Bisikletçilerde Glutamin ve Kreatin Kombine Tüketiminin Fonksiyonel Eşik Güç Üzerine Etkisi
    (2024) Kargın, Zehra; Abdioglu, Mekki; Mor, Hakkı; Okur, Selim Okur Selim; Arslanoglu, Erkal; Mor, Ahmet
    Bu çalışmanın amacı glutamin ve kreatin kombine tüketiminin bisikletçilerin performansına akut etkisinin incelenmesidir. Bu çalışmaya lisanslı, aktif ve antrenmanlı 8 erkek bisikletçi (yaş: 25,85 ± 9,75 yıl; boy uzunluğu: 174,71 ± 5,18 cm; vücut ağırlığı: 69,81 ± 7,16 kg; beden kütle indeksi (BKİ): 22,95 ± 2,97 kg/m2; sporcu yaşı: 5,28 ± 2,28) gönüllü olarak katıldı. Randomize, tek kör ve çapraz döngü çalışmada, bisikletçiler rastgele 2 gruba ayrıldı ve 48 saat ara ile glutamin&kreatin (SUP) veya plasebo (PLA) alarak fonksiyonel eşik güç (FTP) testini uyguladı. Testlerin ardından Borg Skalası, Görsel Analog Skala (GAS) ve Gastrointestinal Semptom Derecelendirme Ölçeği (GSDÖ) uygulandı. Gruplar arası karşılaştırma bağımlı örneklem t-test ile analiz edildi. Ayrıca etki büyüklüğünün hesaplanması için Cohen’s d formülü uygulandı. Testler sonucunda kalp atım hızı (KAH), kadans, FTP (ortalama güç, W, W/kg), algılanan zorluk derecesi (AZD) ve GAS değerlerinde istatistiksel olarak anlamlı fark olmadığı tespit edildi (p>0,05). Ayrıca, SUP grubu lehine kadans değerlerinde düşük (0,34) ve GAS değerlerinde yüksek etki büyüklüğü (0,83) bulunurken, AZD değerlerinde PLA grubu lehine orta etki büyüklüğü (0,61) tespit edildi. GSDÖ bulgularında gruplar arasında anlamlı bir fark olmadığı tespit edildi (p>0,05). Sonuç olarak, çalışmamızda glutamin&kreatin kombine tüketiminin fonksiyonel eşik güç (FTP) ve performans üzerine akut etkisinin olmadığı belirlenmiştir. Bununla birlikte, glutamin&kreatin tüketiminin kas ağrılarına olumlu etki ettiği söylenebilir.
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    Öğe
    Caffeine Improves Sprint Time in Simulated Freestyle Swimming Competition but Not the Vertical Jump in Female Swimmers
    (Mdpi, 2024) Acar, Kuersat; Mor, Ahmet; Mor, Hakki; Kargin, Zehra; Alexe, Dan Iulian; Abdioglu, Mekki; Karayigit, Raci
    Caffeine (CAF) has been shown to be an effective ergogenic aid in enhancing sports performance, including vertical jump (VJ), sprint, balance, agility, and freestyle swimming performance (FSP). However, whether acute CAF supplementation improves FSP in moderately trained female swimmers has not been well documented. Therefore, this study aimed to investigate the effects of CAF intake on vertical jump, balance, auditory reaction time (ART), and swimming performance in female swimmers. In a double-blind, cross-over design, eight moderately trained female swimmers (age: 21.3 +/- 1.4 years, height: 161.2 +/- 7.1 cm, body mass: 56.3 +/- 6.7 kg, body mass index (BMI): 21.9 +/- 1.3 kg/m(2), and habitual CAF intake: 246.4 +/- 111.4 mg/day) ingested caffeine (CAF) (6 mg/kg) or a placebo (PLA) 60 min before completing VJ, balance, ART, and 25/50 m FSP. CAF supplementation resulted in a significantly lower time both in 25m (p = 0.032) and 50m (p = 0.033) FSP. However, CAF resulted in no significant difference in VJ, ART, and RPE (p > 0.05). Balance test results showed a non-significant moderate main effect (d = 0.58). In conclusion, CAF seems to reduce time in short-distance swimming performances, which could be the determinant of success considering the total time of the race. Thus, we recommend coaches and practitioners incorporate CAF into swimmers' nutrition plans before competitions, which may meet the high performance demands.
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    Öğe
    Effects of isolated or combined carbohydrate and caffeine supplementation on tennis training performance: single-blind randomized placebo-controlled crossover session
    (Frontiers Media Sa, 2025) Abdioglu, Mekki; Mor, Ahmet; Alexe, Dan Iulian; Todor, Raul Marian; Panaet, Elena Adelina; Alexe, Cristina Ioana; Akca, Firat
    Background In long tennis matches, the number of unforced errors in groundstrokes increases. However, players need to maintain their successful strokes consistently in order to be successful in matches. To overcome this situation, tennis players utilize certain ergogenic supplements. In order to determine the most effective ergogenic supplement on players' performance, it is aimed to investigate the effects of caffeinated chewing gum (CAFGUM), carbohydrate gel (CHOGEL) and cho gel + cafe gum (CHOGEL + CAFGUM) on tennis players' basic strokes, countermovement jumps (CMJ), heart rate (HR), ratings of perceived exertion (RPE) and gastrointestinal discomfort in a training session.Method The study included 14 male tennis players (mean age: 15.93 +/- 0.83 years, height: 173.86 +/- 6.89 cm, and body mass: 60.64 +/- 2.58 kg) with experience in national and international tournaments. Players ingested CHOGEL (21.1 g) + CAFGUM (100 mg) or CHOGEL (21.1 g) + gum placebo (PLAGUM) or CAFGUM (100 mg) or PLAGUM before a high-intensity workout and at the end of each set.Results The CHOGEL + CAFGUM session performed better groundstrokes than the control (CON) (p = 0.001) and the PLAGUM sessions (p = 0.001). When total RPE values were considered in the training session, the CHOGEL + CAFGUM session had lower RPE scores than the CON (p = 0.010) and PLAGUM (p = 0.044) sessions. The CHOGEL + PLAGUM session had significantly lower RPE scores than the CON (p = 0.005) and PLAGUM (p = 0.005) sessions. The CAFGUM session had significantly lower RPE scores than the CON (p = 0.013). It was observed that no supplements significantly affected either HR (p = 0.188) or CMJ (p = 0.349) scores.Conclusions In conclusion, there was a significant difference on basic strokes and RPE scores between CHOGEL + CAFGUM supplementation used before and during training compared with the control session. At the same time, there was no significant performance outcomes between CHOGEL and CAFGUM sessions.
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    Öğe
    Hemşirelerin ve Hemşirelik Öğrencilerinin Stresli Durumlarda Bilişsel Kontrol ve Esneklik Durumları ve Mesleki Benlik Düzeyleri: Tanımlayıcı ve Kesitsel Bir Araştırma
    (2024) Aydın, Adeviye; Uçgun, Selin; Çelik, Şevval; Abdioglu, Mekki
    Amaç: Hemşirelik mesleğinde mesleki sorumlulukları gerçekleşti- rirken stresli durumlarla karşı karşıya kalınabilmektedir. Mesleki algının ve düşüncenin olumlu yönde gelişmiş olması hemşireleri ve hemşirelik öğren- cilerinin sorunları ele alış şeklini ve ba ş etmelerini de etkileyecektir. Bu araştırmada, hemşirelerin ve hem şirelik öğrencilerinin stresli durumlarda bilişsel kontrol ve esneklik durumları ve mesleki benlik düzeylerinin ince- lenmesi amaçlanmıştır. Gereç ve Yöntemler: Çalışma, tanımlayıcı-kesitsel türdedir. Türkiye’nin kuzeyinde yer alan bir il ve ile bağlı 3 ilçede yer alan devlet hastanelerinde çalışan hemşireler ve bir devlet üniversitesinde eğiti- mine devam etmekte olan hem şirelik öğrencileri ile araştırma gerçekleşti- rilmiştir. Araştırmaya 251 hemşire ve 301 hemşirelik öğrencisi katılmıştır. Verilerin toplanmasında “Tanıtıcı Bilgi Formu”, “Stresli Durumlarda Biliş- sel Kontrol ve Esneklik Ölçeği” ve “Hemşire Mesleki Benlik Ölçeği” kul- lanılmıştır. Veri analizinde t-test, varyans analizi testi, Pearson korelasyon analizinden yararlanılmıştır. Bulgular: Hemşirelerin bilişsel kontrol ve es- neklik toplam puan ortalamalar ının (90,75±16,20) hem şirelik öğrencileri- nin puan ortalamalarından (84,18±14,11) daha yüksek olduğu belirlenmiştir. Mesleki benlik puanında hemşirelerde bakım, iletişim, çalışanlar arası iliş- kiler ve bilgi puan ortalamaları hemşirelik öğrencilerinden daha yüksek ol- duğu saptanm ıştır. Kat ılımcıların bili şsel kontrol ve esneklik puanlar ı arttıkça mesleki benlik puanlarının da arttığı belirlenmiştir (p<0,05). Sonuç: Araştırmadan elde edilen bulgularına göre hemşirelik öğrencilerinin stres- lerine yönelik esneklik ve kontrollerinin artırılması, profesyonellik ve baş et- meye yönelik becerilerinin geli ştirilmesi ve desteklenmesi gerekti ği belirlenmiştir.
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    Öğe
    Moderate-dose caffeine enhances anaerobic performance without altering hydration status
    (Frontiers Media Sa, 2024) Mor, Ahmet; Acar, Kursat; Alexe, Dan Iulian; Mor, Hakki; Abdioglu, Mekki; Man, Maria Cristina; Karakas, Fatih
    The effects of direct nutritional supplements on athletic performance are still being investigated and arouse curiosity. Only one study in the literature was found that investigated the kicking speed performance of futsal players following low-dose caffeine supplementation (3 mg/kg); thus, the question of whether caffeine supplementation improves kicking speed as well as essential physical parameters in soccer players is still controversial. Therefore, the aim of this study was to determine the effect of caffeine supplementation on vertical jump (VJ), sprint, reaction time, balance, change of direction (COD), and ball-kicking speed in soccer players. In a double-blind, cross-over design, nine moderately trained male soccer players (21.11 +/- 2.02 years, 171.22 +/- 6.14 cm, 71.78 +/- 10.02 kg) consumed caffeine (6 mg/kg) or a placebo 60 min before completing balance, reaction time, vertical jump, agility, 30 m sprint, and ball-kicking speed tests. Greater VJ height (p = 0.01) and power (p = 0.08), and faster completion time according to the Illinois Agility Test (p = 0.08) were found following caffeine supplementation compared to placebo. Elapsed time (p = 0.01), average (p = 0.01) time, and the slowest reaction times (p = 0.016) were significantly reduced after caffeine consumption compared to placebo supplementation. Caffeine intake significantly improved VJ, agility, and reaction time (p < 0.05) but did not affect 30 m sprint, ball-kicking speed, balance, and RPE values in soccer players (p > 0.05). Although non-significant, caffeine intake also improved sprint (0.67%) and ball kicking (2.7%) performance percentages. Also, caffeine consumption did not induce dehydration, and the athletes' body hydration levels were normal. These findings support the use of caffeine supplementation as an effective nutritional ergogenic aid to enhance anaerobic performance, at least for vertical jumps, COD speed, and reaction time, in trained male soccer players.
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    Öğe
    The Acute Effects of Caffeine Supplementation on Anaerobic Performance and Functional Strength in Female Soccer Players
    (Mdpi, 2025) Mor, Hakki; Mor, Ahmet; Abdioglu, Mekki; Tohanean, Dragos Ioan; Savu, Catalin Vasile; Acar, Gizem Ceylan; Moraru, Cristina Elena
    Background/Objectives: Despite extensive research on caffeine's (CAF's) ergogenic effects, evidence regarding its impact on anaerobic performance in female athletes remains limited and inconclusive. The aim of this study was to investigate the acute effects of 6 mg/kg(-1) caffeine on anaerobic performance, functional strength, agility, and ball speed in female soccer players. Methods: A randomized, double-blind, placebo-controlled crossover design was employed. Thirteen moderately trained female soccer players (age: 21.08 +/- 1.11 years; height: 161.69 +/- 6.30 cm; weight: 59.69 +/- 10.52 kg; body mass index (BMI): 22.77 +/- 3.50 kg/m(2); training age: 7.77 +/- 1.16 years; habitual caffeine intake: 319 +/- 160 mg/day) completed two experimental trials (caffeine vs. placebo (PLA)), separated by at least 48 h. Testing sessions included performance assessments in vertical jump (VJ), running-based anaerobic sprint test (RAST), bilateral leg strength (LS), handgrip strength (HS), single hop for distance (SH), medial rotation (90 degrees) hop for distance (MRH), change of direction (COD), and ball speed. Rating of perceived exertion (RPE) was also recorded. Results: CAF ingestion significantly improved minimum (p = 0.011; d = 0.35) and average power (p = 0.007; d = 0.29) during RAST. A significant increase was also observed in SHR (single leg hop for distance right) performance (p = 0.045; d = 0.44). No significant differences were found in VJ, COD, ball speed, LS, HS, SHL, MRHR, or MRHL (p > 0.05). RPE showed a moderate effect size (d = 0.65) favoring the CAF condition, though not statistically significant (p = 0.110). Conclusions: In conclusion, acute CAF intake at a dose of 6 mg/kg(-1) may enhance anaerobic capacity and lower-limb functional strength in female soccer players, with no significant effects on jump height, agility, or upper-body strength.