The relationship between the ventilation and lactate thresholds following normal, low and high carbohydrate diets

  • Thomas M. McLellan
  • Gregory C. Gass


Five men performed an incremental exercise test following a normal, low and high carbohydrate dietary regimen over a 7-day period, to examine the influence of an altered carbohydrate energy intake on the relationship between the ventilation (V E T) and lactate (LaT) thresholds. V E T and LaT were determined from the ventilatory equivalents for O2 (\(\dot V_E \cdot \dot V_{O_2^{ - 1} }\)) and CO2 (\(\dot V_E \cdot \dot V_{O_2^{ - 1} }\)) and the log-log transformation of the lactate (La) to power output relationship, respectively. The total duration of the incremental exercise test, carbon dioxide output (\(\dot V_{CO_2 }\)), respiratory exchange ratio, blood La values and arterialized venous partial pressure of CO2\((P_{CO_2 } )\) were reduced, and \(\dot V_E \cdot \dot V_{O_2^{ - 1} }\), the slope of the \(\dot V_E - \dot V_{CO_2 }\) relationship, blood β-hydroxybutyrate and pH were increased during the low carbohydrate trial compared with the other conditions. Total plasma protein and Na+, K+, and Cl were similar across conditions. LaT and V E T were unaffected by the altered proportions of carbohydrate in the diets and occurred at a similar oxygen consumption (mean \(\dot V_{O_2 }\) across trials was 1.98 L · min−1 for V E T and 2.01 L · min−1 for LaT). A significant relationship (r=0.86) was observed for the \(\dot V_{O_2 }\) that represented individual V E T and LaT values. The increased \(\dot V_E \cdot \dot V_{O_2^{ - 1} }\) and slope of the \(\dot V_E - \dot V_{CO_2 }\) relationship could be accounted for by the lower \(P_{CO_2 }\). It is concluded that alterations in carbohydrate energy intake do not produce an uncoupling of V E T and LaT as has been reported previously.

Key words

Ventilation and blood lactate Strong ion difference Hydrogen ion \(P_{CO_2 }\) Ventilatory equivalents for oxygen and carbon dioxide 


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Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • Thomas M. McLellan
    • 1
  • Gregory C. Gass
    • 1
  1. 1.Applied Physiology Division, Department of Biological SciencesCumberland College of Health SciencesLidcombeAustralia

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