TY - JOUR
T1 - Dyspnea on exertion in obese men
AU - Bernhardt, Vipa
AU - Wood, Helen E.
AU - Moran, Raksa B.
AU - Babb, Tony G.
N1 - Funding Information:
American Lung Association , King Charitable Foundation Trust , The Research and Education Institute at Texas Health Resources , Cain Foundation , and Texas Health Presbyterian Hospital Dallas , and NIH HL096782 . The sponsors had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; and preparation, review, or approval of the manuscript.
PY - 2013/1/5
Y1 - 2013/1/5
N2 - 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.
AB - 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.
KW - Breathlessness
KW - Exercise
KW - Obesity
KW - Oxygen cost of breathing
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U2 - 10.1016/j.resp.2012.10.007
DO - 10.1016/j.resp.2012.10.007
M3 - Article
C2 - 23085240
AN - SCOPUS:84871921327
SN - 1569-9048
VL - 185
SP - 241
EP - 248
JO - Respiratory Physiology and Neurobiology
JF - Respiratory Physiology and Neurobiology
IS - 2
ER -