Sporcularda Kafein Alımı
Özet
Kafein, 2012 ve 2016 Olimpiyat Oyunları'nda %1’lik bir performans farkının bile madalya belirleyici olduğu elit seviye sporlarda, sporcular tarafından sıklıkla tercih edilen ergojenik bir takviyedir. Elit sporcuların %74’ünün yarışma öncesinde veya sırasında kullandığı kafein, özellikle dayanıklılık sporlarında yaygın olup düşük ila orta dozlarda (1-6 mg/kg) etki göstermektedir. Hücre içi kalsiyum ve serbest yağ asidi mobilizasyonunu etkilemekle birlikte kafeinin ana mekanizması adenozin reseptörü antagonizmasıdır. Ayrıca beta endorfin salgılanmasını artırarak egzersiz sırasındaki ağrı ve yorgunluk hissini azaltmakta, 100 mg gibi düşük miktarlarda bile 3 saati aşan süreyle termojenik etki oluşturup enerji harcamasını yükseltmektedir. Araştırmalarda, kapsül formundaki kafeinin kahveye kıyasla tükenme süresini uzatmada daha etkili olduğu, tükenme mesafesini 2-3 km artırabildiği ve performansı plaseboya oranla %24’e kadar geliştirebildiği görülmüştür. Kafein takviyesinin güce ve yüksek şiddetli eforlara etkisi bireylerin antrenman düzeyine bağlıdır; antrenmansız kişilerde anlamlı bir etki yaratmazken antrenmanlı sporcularda zirve güç, yüzme ve bisiklet performanslarında belirgin artışlar sağlamaktadır. Son olarak, egzersiz öncesi veya sırasında alınan kafeinin terleme ve sıvı dengesini olumsuz etkilemediği, diüretik etkisine dair yaygın yanlış inanışın dinlenme anında yapılan idrar ölçümlerinden kaynaklandığı bildirilmiştir.
Caffeine is an ergogenic supplement frequently preferred by athletes in elite sports, where even a 1% performance difference could determine a medal in the 2012 and 2016 Olympic Games. Used by 74% of elite athletes before or during competition, caffeine is particularly common in endurance sports and is effective at low-to-moderate doses (1-6 mg/kg). Although it affects intracellular calcium and free fatty acid mobilization, caffeine's main mechanism of action is adenosine receptor antagonism. Furthermore, by stimulating beta-endorphin secretion, it reduces pain and fatigue during exercise, and even at doses as low as 100 mg, it creates a thermogenic effect lasting over 3 hours to increase energy expenditure. Studies show that capsule forms of caffeine are more effective in extending time to exhaustion than coffee, increasing exhaustion distance by 2-3 km and improving performance by up to 24% compared to placebo. The impact of caffeine supplementation on power and high-intensity efforts depends on individual training levels; while it produces no significant effect in untrained individuals, it yields notable improvements in peak power, swimming, and cycling performances among trained athletes. Finally, caffeine ingested prior to or during exercise does not adversely affect sweating or fluid balance, and common misconceptions regarding its diuretic effect stem from urine measurements taken at rest.
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