Document Detail

The relationship between the ventilation and lactate thresholds following normal, low and high carbohydrate diets.
MedLine Citation:
PMID:  2731528     Owner:  NLM     Status:  MEDLINE    
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 (VET) and lactate (LaT) thresholds. VET and LaT were determined from the ventilatory equivalents for O2 (VE.VO2(-1) and CO2 (VE.VCO2(-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 (VCO2), respiratory exchange ratio, blood La values and arterialized venous partial pressure of CO2 (PCO2) were reduced, and VE.VCO2(-1), the slope of the VE-VCO2 relationship, blood beta-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 VET were unaffected by the altered proportions of carbohydrate in the diets and occurred at a similar oxygen consumption (mean VO2 across trials was 1.98 L.min-1 for VET and 2.01 L.min-1 for LaT). A significant relationship (r = 0.86) was observed for the VO2 that represented individual VET and LaT values. The increased VE.VCO2(-1) and slope of the VE-VCO2 relationship could be accounted for by the lower PCO2. It is concluded that alterations in carbohydrate energy intake do not produce an uncoupling of VET and LaT as has been reported previously.
T M McLellan; G C Gass
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  European journal of applied physiology and occupational physiology     Volume:  58     ISSN:  0301-5548     ISO Abbreviation:  Eur J Appl Physiol Occup Physiol     Publication Date:  1989  
Date Detail:
Created Date:  1989-07-14     Completed Date:  1989-07-14     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0410266     Medline TA:  Eur J Appl Physiol Occup Physiol     Country:  GERMANY, WEST    
Other Details:
Languages:  eng     Pagination:  568-76     Citation Subset:  IM; S    
Department of Biological Sciences, Cumberland College of Health Sciences, Lidcombe, NSW, Australia.
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MeSH Terms
Dietary Carbohydrates / administration & dosage*,  metabolism
Energy Metabolism
Exercise Test
Glycogen / metabolism
Hydrogen-Ion Concentration
Lactates / blood*
Muscles / metabolism
Oxygen Consumption
Physical Exertion*
Time Factors
Reg. No./Substance:
0/Dietary Carbohydrates; 0/Lactates; 9005-79-2/Glycogen

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