Turkiye Klinikleri Journal of Sports Sciences

.: ORIGINAL RESEARCH
Şiddetli Egzersiz Alanının Üst Sınırını Belirlemede Kullanılan Bir Yöntemin Maksimal Laktat Dengesini Belirleyebilme Başarısının Değerlendirilmesi: Deneysel Çalışma
Evaluation of the Success of Determining the Maximal Lactate Steady-State of a Method Used to Determine the Upper Limit of Severe Exercise Domain: Experimental Research
Egemen ALPa, Refik ÇABUKb, Hakan ASa, Görkem Aybars BALCIc , Özgür ÖZKAYAc
aEge Üniversitesi Sağlık Bilimleri Enstitüsü, Spor Sağlık Bilimleri Bölümü, İzmir, Türkiye
aBayburt Üniversitesi Beden Eğitimi ve Spor Yüksekokulu, Antrenörlük Eğitimi Bölümü, Bayburt, Türkiye
aEge Üniversitesi Spor Bilimleri Fakültesi, Antrenörlük Eğitimi Bölümü, Hareket ve Antrenman Bilimleri ABD, İzmir, Türkiye
Turkiye Klinikleri J Sports Sci. 2023;15(1):60-7
doi: 10.5336/sportsci.2022-93024
Article Language: TR
Full Text
ÖZET
 Amaç: Maksimal laktat dengesi (MLD), şiddetli egzersiz alanının alt sınırını belirleyebilmenin geçerli ve güvenilir bir yöntemidir. Diğer yandan, yakın zamanda ortaya atılan bir teknik, şiddetli egzersiz alanının üst sınırını belirlemede popüler olmuştur (the highest intensity; IHIGH). Ancak bu yeni tekniğin altında yatan teorik temele dayalı olarak, MLD'yi sorgulayan bir çalışma yapılmamıştır. Bu çalışmanın amacı, IHIGH belirlemede kullanılan bu yöntemin alt sınıra uygulanması sonucunda elde edilecek egzersiz şiddetinin MLD'yi hangi düzeyde karşılayacağının araştırılmasıydı. Gereç ve Yöntemler: Çalışma, iyi antrene 10 bisiklet sporcusuyla yapıldı. Katılımcılar, tüketici kademeli egzersizlerden sonra bireysel IHIGH düzeylerinin belirlenmesi için bir dizi sabit yüklü tüketici egzersize tabi tutuldu. Bireysel IHIGH düzeyleri, hâlen zirve oksijen kullanımı veren (⩒O2pik) en yüksek egzersiz şiddeti olarak kabul edildi. MLD, farklı egzersiz şiddetlerinde yapılan 30 dk'lık submaksimal egzersizlerin 30 ve 10. dk kan laktatı farklarının 1 mmol'L-1'den az olabildiği en yüksek egzersiz şiddeti dikkate alınarak belirlendi. Değişkenler arasındaki farklılıklar, eşleştirilmiş örneklem ttest ile değerlendirildi. Etki büyüklüğü (EB) Cohen d'ye göre analiz edildi. Bulgular: Beklendiği gibi MLD ve IHIGH egzersiz şiddetine ait ortalama ⩒O2 farkları anlamlıydı (55,2±4,50'ye kıyasla 61,2±5,06 mL∙dk-1∙kg-1; p=0,000; EB=2,17). Ancak MLD %5 aşıldığında yapılan bir egzersize ait ortalama ⩒O2 değerleri, IHIGH'ı belirlemede kullanılan yöntemle elde edilen ⩒O2pik'e ulaşamadı (56,3±3,42'ye kıyasla 60,6±5,02 mL'dk-1'kg-1; p=0,002; EB=1,50). Sonuç: Elde edilen bulgulara göre IHIGH'ı belirlemede kullanılan prosedürün ve şiddetli egzersiz alanı için hesaplanan ⩒O2pik'in aynı alanın alt sınırı için geçerli olmadığı ortaya koyuldu.

Anahtar Kelimeler: En yüksek yoğunluk; maksimal laktat dengesi; VO2maks; VO2pik
ABSTRACT
 Objective: Maximal lactate steady-state (MLSS) is a valid and reliable method for determining the lower limit of the severe exercise domain. Meanwhile, a recently introduced technique, called as the highest intensity (IHIGH), has become popular for detecting the upper boundary of severe exercise domain. However, no study has been conducted to question MLSS based on the theoretical basis of this new technique. The aim of this study was to investigate at what level the exercise intensity obtained as a result of applying this method (i.e., IHIGH) to the lower boundary corresponds to the MLSS. Material and Methods: This study was conducted with well-trained 10 cyclists. Following exhaustive incremental exercises, participants were subjected to a series of constant work-rate exhaustive exercises to determine their individual work-rates corresponding to the IHIGH. Their individual IHIGH levels were considered as the highest exercise intensity which is still giving peak oxygen consumption ⩒O2peak). The MLSS was determined as considering the highest exercise intensity at which the 30th and 10th minute blood lactate differences, obtained from 30-minute of submaximal exercises performed at different exercise intensities, could be less than 1 mmol'L-1. Differences between variables were evaluated with paired samples t-test. The effect size (ES) was analysed based on Cohen's d. Results: As expected, mean ⩒O2 difference between MLSS and IHIGH was significantly different (55.2±4.50 vs. 61.2±5.06 mL∙min-1∙kg-1; p=0.000; ES=2.17). However, when the MLSS was exceeded 5%, exercising ⩒O2 response could not elicit the ⩒O2peak obtained by the method used to determine the IHIGH (60.6±5.02 vs. 56.3±3.42 mL min-1kg-1; p=0.002; ES=1.50). Conclusion: According to the findings, it was revealed that the procedure used to determine a IHIGH for the upper bound and predicted ⩒O2peak for the severe exercise domain are not valid when compared to the lower boundary of the same exercise domain (i.e., MLSS).

Keywords: The highest intensity; maximal lactate steady-state; VO2max; VO2peak
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