Document Detail

Oxygen Cost of Breathing and Breathlessness during Exercise in Nonobese Women and Men.
MedLine Citation:
PMID:  22143111     Owner:  NLM     Status:  Publisher    
INTRODUCTION: Although it has been reported that the work of breathing may be higher in women, inconsistencies among studies leaves this important question unresolved. Also, the association between the oxygen cost of breathing and rating of perceived breathlessness (RPB) during exercise has not been examined between women and men. PURPOSE: To measure oxygen cost of breathing during eucapnic voluntary hyperpnea and RPB (Borg 0-10 scale) during 6 minutes of constant work rate cycling at 60 and 90W, respectively, in healthy nonobese women and men. METHODS: Nine women (27yr,21BMI) and ten men (29yr,25BMI) participated. All subjects underwent pulmonary function testing, exercise cycling, and determination of oxygen cost of breathing during eucapnic voluntary hyperpnea. Oxygen cost of breathing was obtained from the slope of the oxygen uptake (ml/min) and ventilation (L/min) relationship. RPB and cardio-respiratory measures were collected during minute 6 of the exercise. Data were analyzed by independent t-test and regression analysis. RESULTS: Age and pulmonary function were similar between the nonobese women and men. Oxygen cost of breathing was similar between the nonobese women (1.17±0.26ml/L) and men (1.21±0.42ml/L). RPB during exercise was similar between the women (2.1±1.3) and men (2.6±1.2) and was correlated (p<0.05) with relative oxygen uptake (r=0.55), but not the oxygen cost of breathing. CONCLUSION: In nonobese women and men, oxygen cost of breathing is not different over the ventilatory ranges studied and RPB is similar at the same relative exercise intensity. In addition, the oxygen cost of breathing was not associated with RPB during constant work rate exercise.
Santiago Lorenzo; Tony G Babb
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-12-2
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  -     ISSN:  1530-0315     ISO Abbreviation:  -     Publication Date:  2011 Dec 
Date Detail:
Created Date:  2011-12-6     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
1Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas 2The University of Texas Southwestern Medical Center, Dallas, TX 75231.
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