A Comparison of Isocapnic Buffering Phase of Young Female Cross-Country and Alpine Skiers

Öz

The purpose of this study was to compare the isocapnic buffering phase in young female cross-country skiers and alpine skiers. International level young female skiers including ten cross-country skiers and eight alpine skiers took part in the study. Maximal oxygen uptake (VO2max), ventilatory threshold (VT) and respiratory compensation point (RCP) were determined using an incremental treadmill exercise test. VT and RCP were determined using the V-slope method. The isocapnic buffering (ICB) phase was calculated as the difference in VO2 (ICBVO2) and running speed (ICBSPEED) between RCP and VT and expressed in either absolute or relative values. The values of VO2, heart rate, and running speed corresponding to the VT and RCP were identified. Relative VT and RCP values were recorded as a percentage of VO2max and maximal running speed. Time to exhaustion was determined as the total duration of the test. VO2max, maximal running speed, time to exhaustion, both absolute and relative VT values and absolute RCP values were higher in the cross-country skiers than in the alpine skiers (P<0.05), whereas relative RCP showed similar values in both group (p>0.05). Absolute ICBSPEED showed similar values in both group (p>0.05), whereas absolute and relative ICBVO2 and relative ICBSPEED were found to be significantly higher in alpine skiers than in cross-country skiers (P<0.05). The results of this study indicated that the aerobic capacity and ventilatory threshold lower in alpine skiers than in cross-country skiers, while the isocapnic buffering phase and the high-intensity exercise tolerance were higher in alpine skiers.

Anahtar Kelimeler

• Buffering capacity,maximal oxygen uptake,respiratory compensation point,training,ventilatory threshold

Genç Kadın Kros ve Alp Kayakçılarında İzokapnik Tamponlama Fazının Karşılaştırılması

Öz

Bu çalışma, genç kadın kros ve alp kayakçılarının izokapnik tamponlama faz değerlerini birbirleriyle karşılaştırmak amacıyla çalışılmıştır. Araştırmaya, uluslararası düzeyde yarışmalara katılan 10 genç kadın kros kayakçısı ve 8 genç kadın alp kayakçısı katılmıştır. Maksimal oksijen alımı (VO_2max), solunumsal eşik (SE) ve solunumsal kompenzasyon noktası (SKN) değerleri [1]koşu bandında şiddeti giderek artan egzersiz test protokolü uygulanarak tespit edilmiştir.SE ve SKN değerleri V-Slope yöntemi ile belirlenmiştir. İzokapnik tamponlama (İKT) fazı, SKN ile SE arasındaki fark olarak hesaplandı ve hem mutlak hem de göreceli VO₂ (İKT_VO2) ve koşu hızı (İKT_HIZ) değerleri ile ifade edildi. SE ve SKN karşılık gelen VO₂, kalp atımı hızı ve koşu hızı tespit edilerek, VO_2max’nin ve maksimal koşu hızının yüzdesi cinsinden görece değerleri hesaplandı. Tükenme zamanı testin toplam süresi olarak belirlendi.Kros kayakçıları VO_2max, maksimal koşu hızı, tükenme zamanı, hem mutlak hem de göreceli SE değerleri ve mutlak SKN değerleri alp kayakçılarına kıyasla anlamlı olarak yüksek bulunurken (P<0.05), görece SKN değerleri arasında istatistiksel olarak anlamlı fark görülmedi (p>0.05). Hem mutlak hem de görece İKT_VO2 değerleri alp kayakçılarında kros kayakçılarına kıyasla istatistiksel olarak daha yüksek bulundu (p<0.05). Görece İKT_HIZ değerleri alp kayakçılarında kros kayakçılarına kıyasla anlamlı olarak yüksek bulunurken (p<0.05), mutlak İKT_HIZ değerleri iki grupta istatistiksel olarak benzerlik gösterdi (p>0.05). Araştırma bulgularımız, alp kayakçıların kros kayakçılarına kıyasla aerobik kapasitelerinin daha düşük ve solunumsal eşiğe daha erken girdiklerini, öte yandan izokapnik tamponlama fazlarının daha geniş ve eşik sonrası egzersize toleranslarının daha yüksek olduğunu göstermiştir.

Anahtar Kelimeler

• Antrenman,maksimal oksijen alımı,solunumsal eşik,solunumsal kompenzasyon noktası,tampon kapasitesi

Kaynakça

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