The aim of this research was to establish whether any measured factors could limit energy supply on 200 m front crawl swimming. Twelve male swimmers performed 4 swims of 200 m crawl at intensities of 80%, 90%, 100% and 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 of measured maximal parameters and time constant parameters) in comparison to maximal swims. Limitations in obtained maximal [LA-] and minimal pH values were found. It is possible to conclude that individual limitations in VE, Vo2, HR and consequently acidosis could be limiting factors of individual performance on 200 m front crawl because of energy supply limitations.
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