Document Detail

Comparison of objective methods for determining ventilatory threshold.
MedLine Citation:
PMID:  3172574     Owner:  NLM     Status:  MEDLINE    
This study was undertaken to compare and re-examine the relation of lactate threshold (LT) and ventilatory threshold (VT), using six objective determination methods proposed previously. Twenty-one young male subjects performed a cycle exercise test in which the work rate was increased by 150 kg.m every 2 min up to his limit of volitional fatigue. Through each test, gas exchange parameter measurements were made every 1 min (every 30 s at nearly maximal level), and the venous blood samples were taken from a warmed ear lobe at each work rate for determining blood lactate concentration. LT and its variance were determined by the intersecting straight lines regression. LT ranged from 0.72 to 1.40 l/min in terms of VO2, and the mean value of S.D. for each LT was about 0.1 l/min. Each objective method for determining VT used in this study was based on the simple modelling of the criterion for visual detection of VT, that is the non-linear increase in VE or the systematic increase in VE/VO2. When the relationship between LT and VT was examined, VT by the objective methods based on determining minimum value of VE/VO2 showed relatively high consistency with LT. Of 16-20 individuals out of all 21 subjects, there were VT within LT +/- 0.2 in VO2. It is concluded that VE/VO2 is a more sensitive index for detecting VT than VE in the gas exchange parameters, and the objective VT determination method based on minimum value of VE/VO2 could facilitate estimation of LT within an error of +/- 0.2 l/min VO2 in most normal individuals.
Y Fukuba; M Munaka; S Usui; H Sasahara
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Japanese journal of physiology     Volume:  38     ISSN:  0021-521X     ISO Abbreviation:  Jpn. J. Physiol.     Publication Date:  1988  
Date Detail:
Created Date:  1988-11-03     Completed Date:  1988-11-03     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  2985184R     Medline TA:  Jpn J Physiol     Country:  JAPAN    
Other Details:
Languages:  eng     Pagination:  133-44     Citation Subset:  IM; S    
Department of Biometrics, Hiroshima University, Japan.
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MeSH Terms
Lactates / blood*
Lactic Acid
Physical Exertion
Pulmonary Gas Exchange
Reg. No./Substance:
0/Lactates; 50-21-5/Lactic Acid

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