Document Detail

Long-term stability of the oxygen pulse curve during maximal exercise.
MedLine Citation:
PMID:  21484034     Owner:  NLM     Status:  MEDLINE    
INTRODUCTION: Exercise oxygen pulse (O₂ pulse), a surrogate for stroke volume and arteriovenous oxygen difference, has emerged as an important variable obtained during cardiopulmonary exercise testing.
OBJECTIVES: We hypothesized that the O₂ pulse curve pattern response to a maximal cycling ramp protocol exhibits a stable linear pattern in subjects reevaluated under the same clinical conditions.
METHODS: We retrospectively studied 100 adults (80 males), mean age at baseline of 59 + 12 years, who performed two cardiopulmonary exercise testings (median interval was 15 months), for clinical and/or exercise prescription reasons. The relative O₂ pulse was calculated by dividing its absolute value by body weight. Subjects were classified into quintiles of relative O₂ pulse. Cardiopulmonary exercise testing results and the O₂ pulse curve pattern, expressed by its slope and intercept, were compared among quintiles of relative O₂ pulse at both cardiopulmonary exercise testings.
RESULTS: After excluding the first minute of CPX (rest-exercise transition), the relative O₂ pulse curve exhibited a linear increase, as demonstrated by high coefficients of determination (R² from 0.75 to 0.90; p < 0.05 for all quintiles). Even though maximum oxygen uptake and relative O₂ pulse were significantly higher in the second cardiopulmonary exercise testing for each quintile of relative O₂ pulse (p < 0.05 for all comparisons), no differences were found when slopes and intercepts were compared between the first and second cardiopulmonary exercise testings (p > 0.05 for all comparisons; except for intercept in the 5th quintile).
CONCLUSION: Excluding the rest-exercise transition, the relative O₂ pulse exhibited a stable linear increase throughout maximal exercise in adults that were retested under same clinical conditions.
Ricardo Brandão Oliveira; Jonathan Myers; Claudio Gil Soares de Araújo
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Clinics (São Paulo, Brazil)     Volume:  66     ISSN:  1980-5322     ISO Abbreviation:  Clinics (Sao Paulo)     Publication Date:  2011  
Date Detail:
Created Date:  2011-04-12     Completed Date:  2011-11-09     Revised Date:  2013-06-30    
Medline Journal Info:
Nlm Unique ID:  101244734     Medline TA:  Clinics (Sao Paulo)     Country:  Brazil    
Other Details:
Languages:  eng     Pagination:  203-9     Citation Subset:  IM    
Gama Filho University, Rio de Janeiro, Rio de Janeiro, Brazil.
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MeSH Terms
Analysis of Variance
Body Weight / physiology*
Exercise Test / methods*
Exercise Tolerance / physiology*
Heart Rate / physiology*
Middle Aged
Oxygen Consumption / physiology*
Retrospective Studies

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