The main aim of this study was to determine whether ventilatory efficiency during incremental exercise is related to various types of myosin heavy chain (MyHC) content in vastus lateralis in. quadricipitis femoris in young healthy men. The respiratory efficiency was expressed by VE/VCO2 slope, determined during sublactate threshold power outputs of the incremental exercise. A significant negative correlation between V(E)/VCO2 and P(ET)CO2 (amounting to: at rest r = -0.43 p < 0.05; at the LT r = -0.87 p < 0.01; at the VO2 max r = -0.95 p < 0.01) was observed. Moreover, the level of PETCO2 at rest and during exercise was not related to the MyHC content of the vastus lateralis muscle. No relationship between the content of various types of MyHC and respiratory efficiency was found.
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