Sedanter bireyler ve sporcularda substrat kesişim noktasındaki yağ oksidasyon hızlarının karşılaştırılması

Yıl 2019, Cilt: 44 Sayı: Ek 1, 412 - 418, 29.12.2019

Özgür Günaştı Çiğdem Özdemir Kerem T. Özgünen Abdullah Kılcı Selcen Korkmaz Eryılmaz S. Sadi Kurdak

https://doi.org/10.17826/cumj.571942

Öz

Amaç: Bu çalışmada sporcu ve sedanter bireylerin performans testleri sonucunda tespit edilen en yüksek yağ yakım aralıkları ve substrat kesişim noktalarındaki metabolik değişkenlerin değerlendirilmesi amaçlanmıştır.

Gereç ve Yöntem: Çalışmaya 10 sedanter (22,1 ± 0,5 yıl) ve 11 sporcu (22,3 ± 0,6 yıl) olmak üzere toplam 21 erkek gönüllü katılmıştır. Katılımcıların egzersiz testleri yürüme bandında indirekt kalorimetre kullanılarak yapılmıştır (Cosmed Quark CPET). Uygulanan iki farklı egzersiz testi sonucunda katılımcıların performans düzeylerine ve yağ oksidasyon hızlarına ait veriler elde edilmiştir.

Bulgular: Beden kitle indekslerine göre sporcular normal, sedanter bireyler ise fazla kilolu sınıfında yer almışlar ve sedanter bireylerin vücut yüzde yağ oranları sporculara kıyasla istatistiksel olarak anlamlı düzeyde yüksek bulunmuştur. Sporcuların pik oksijen alım seviyeleri anlamlı düzeyde yüksek olmasına karşın, en yüksek yağ oksidasyon hızları sedanter bireylere benzer seviyede tespit edilmiştir. Karbonhidratların baskın enerji kaynağı haline gelmeye başladığı kesişim noktasında, sporcu ve sedanter bireylerin oksijen alım miktarları arasında istatistiksel fark olmamasına karşın, bu değerin maksimal oksijen alım kapasitelerine oranı değerlendirildiğinde sporcu grupta istatistiksel olarak anlamlı düzeyde düşük bulunmuştur. 

Sonuç: Oksijen alım kapasitesi yüksek olan sporcu bireylerin hem en yüksek yağ yakım hızlarının hem de kesişim noktasındaki yağ yakım hızlarının sedanter gruba kıyasla istatistiksel farklılık göstermemesi, yağ oksidasyonunu belirleyen tek faktörün maksimal aerobik kapasite olmayabileceğini düşündürmektedir.

Anahtar Kelimeler

Kardiyopulmoner egzersiz testi, kesişim noktası, yağ oksidayonu

Comparison of fat oxidation rates at substrate intersection in sedentary individuals and athletes

Öz

Purpose: The aim of this study was to evaluate metabolic responses of athletic and sedentary men at maximal fat oxidation and crossover points that were determined by performance tests. 

Materials and Methods: 10 sedentary (22.1 ± 0.5 years) and 11 athletic (22.3 ± 0.6 years) volunteers participated in this study. Participants’ exercise tests were performed on a treadmill. Maximal fat oxidation rates and metabolic responses at cross over point (COP) were measured by indirect calorimeter (Cosmed Quark CPET). 

Results: Sedentary individuals were classified as overweight whereas athletic individuals were classified as normal according to their body mass indices and sedentary individuals’ body fat percentage were significantly higher than athletic participants. Although athletic participants’ peak oxygen uptakes were significantly higher, maximal fat oxidation rates were similar at both groups. At COP where oxidation of carbohydrates predominate fat oxidation, both group’s oxygen consumption rates were found to be similar. On the other hand, the ratio of oxygen consumption to maximal oxygen uptake at COP was significantly lower in athletic group.

Conclusion: Athletic individuals’, whom had higher oxygen uptake capacities, maximal fat oxidation rates and fat oxidation rates at COP were not significantly higher than sedentary individuals. This finding indicates that maximal aerobic capacity might not be the only determinant of fat oxidation.

Anahtar Kelimeler

Cardiopulmonary exercise test, cross over point

Kaynakça

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