The purpose of the study was to establish whether anaerobic lactic production and oxygen uptake could limit the energy supply during 200 m front crawl swimming. Twelve male swimmers performed four swims of 200 m crawl at intensities from 80%, 90%, 100% to 110% (until exhaustion) on separate days with a swimming snorkel. Respiratory parameters (VE, Vo2), blood parameters (pH, [LA-]) and heart rate (HR) were measured. The results demonstrate that limitations in VE, Vo2 and HR during swimming occur during supramaximal swims (no further increase in measured maximal parameters and time-constant parameters) in comparison to maximal swims. We also found limitations in the obtained maximal [LA-] and minimal pH values. It is possible to conclude that individual limitations in VE, Vo2, HR and consequently acidosis could be limiting factors of individual 200 m front crawl performances due to energy supply restrictions.
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