Objective: This study aimed to investigate the effects of different doses of beetroot juice (BJ) on submaximal exercise performance in elite male short-distance runners. Material and Methods: Twelve elite male short-distance runners (mean age: 19.0±1.54 years, mean body weight: 66.0±4.7 kg, mean height: 176.5±5.3 cm, mean body fat: 7.68±2.78%) voluntarily participated in this single-blind, placebocontrolled, crossover design trial. The study design involved three separate occasions with one-week intervals between sessions. Participants consumed BJ containing different nitrate (NO3 −) doses (0.04 mmol as placebo, 6 mmol, or 10 mmol) three hours before each exercise trial. Participants performed treadmill exercise tests until exhaustion at 85% HR reserve, during which time to task failure (TTF), HR, ratings of perceived exertion (RPE), and rating of perceived hunger (RPH) were recorded. Blood pressure (BP) was measured before BJ ingestion, pre and post exercise. All trials were conducted between 8 and 12 AM. Results: When blood pressures were examined, a statistically significant difference was found the both BJ trials (6 mmol and 10 mmol NO3 −) compared to placebo trial (p0.05). Conclusion: In male elite short-distance runners, 10 mmol NO3 − BJ dose may enhance performance, while the 6 mmol NO3 − BJ dose did not show such an effect.
Keywords: Performance; beetroot juice; ergogenic aids; blood pressure; fatigue
Amaç: Bu çalışma, elit erkek kısa mesafe koşucularında farklı dozlardaki pancar suyunun submaksimal koşu performansı üzerindeki etkilerini incelemeyi amaçlamıştır. Gereç ve Yöntemler: Tek kör, plasebo kontrollü, çapraz tasarımlı deneme modeli ile yapılan bu çalısmaya ̧ on iki elit düzeyde kısa mesafe kosucusu (ya ̧ ş: 19,0±1,54 yıl, vücut ağırlığı: 66,0±4,7 kg, boy: 176,5±5,3 cm, vücut yağı yüzdesi: 7,68±2,78) gönüllü olarak katılmıştır. Çalışma tasarımı, denemeler arasında bir haftalık ara verilecek şekilde üç ayrı test sürecini içermiştir. Katılımcılar, test sürecinden üç saat önce farklı nitrat (NO3 − ) dozlarını içeren pancar suyu tüketmişlerdir (plasebo olarak 0,04 mmol, 6 mmol veya 10 mmol). Katılımcılar, kalp atım hızı (KAH) rezervinin %85'inde tükeninceye kadar koşu bandında koşmuştur. Bu süre zarfında KAH, hissedilen yorgunluk ve açlık dereceleri kaydedilmiştir. Pancar suyu tüketiminden önce, test öncesi ve sonrası kan basıncı ölçülmüştür. Tüm denemeler sabah saat 8 ile 12 arasında gerçekleştirilmiştir. Bulgular: Kan basınçları incelendiğinde; 6 mmol ve 10 mmol NO3 − pancar suyu denemeleriyle plasebo denemesi arasında istatistiksel olarak anlamlı bir fark bulunmuştur (p0,05). Sonuç: Erkek elit kısa mesafe koşucularında, 10 mmol NO3 − pancar suyu performansı artırabilirken, 6 mmol NO3 − pancar suyu dozu böyle bir etki göstermemiştir.
Anahtar Kelimeler: Performans; pancar suyu; ergojenik yardımcılar; kan basıncı; yorgunluk
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