Dyspnea on exertion in obese men

Vipa Bernhardt, Helen E. Wood, Raksa B. Moran, Tony G. Babb

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

Recently, we reported that dyspnea on exertion is strongly associated with an increased oxygen cost of breathing in otherwise healthy obese women; the mechanism of dyspnea on exertion in obese men is unknown. Obese men underwent measurements of body composition, fat distribution, pulmonary function, steady state and maximal graded cycle ergometry, and oxygen cost of breathing. Nine men (34 ± 8 years, 35 ± 4 BMI) with ratings of perceived breathlessness of ≤2 during cycling, and ten men (36 ± 9 years, 38 ± 5 BMI) with ratings of perceived breathlessness ≥4 were studied (ratings of perceived breathlessness: 1.8 ± 0.4 vs. 4.7 ± 0.8, respectively; p<0.0001). Groups had only minor differences in fat distribution, pulmonary function, and steady state exercise. There was no association between ratings of perceived breathlessness and oxygen cost of breathing; but ratings of perceived breathlessness was strongly correlated with ratings of perceived exertion (RPE, rho = 0.87, p<0.0001). The differences in exercise intensity, ventilatory demand, cardiovascular conditioning and/or the quality of respiratory sensation did not appear to play a role in the development of dyspnea on exertion. The mechanism of dyspnea on exertion in obese men seems unrelated to the oxygen cost of breathing.

Original languageEnglish (US)
Pages (from-to)241-248
Number of pages8
JournalRespiratory Physiology and Neurobiology
Volume185
Issue number2
DOIs
StatePublished - Jan 5 2013

Keywords

  • Breathlessness
  • Exercise
  • Obesity
  • Oxygen cost of breathing

ASJC Scopus subject areas

  • Neuroscience(all)
  • Physiology
  • Pulmonary and Respiratory Medicine

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