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Cigarette smoking decreases dynamic inspiratory capacity during maximal exercise in patients with type 2 diabetes.
MedLine Citation:
PMID:  22916510     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
To investigate the influence of cigarette smoking on exercise capacity, respiratory responses and dynamic changes in lung volume during exercise in patients with type 2 diabetes. Forty-one men with type, 2 diabetes without cardiopulmonary disease were recruited and divided into 28 non-current smokers and 13 current smokers. All subjects received lung function tests and cardiopulmonary exercise testing using tracings of the flow-volume loop. Exercise capacity was compared using the percentage of predicted oxygen uptake at maximal workload (%VO2max). Respiratory variables and inspiratory capacity (IC) were compared between the two groups at rest and at 20%, 40%, 60%, 80% and 100% of maximum workload. Although there was no significant difference in lung function tests between the two groups, venous carboxyhemoglobin (CO-Hb) levels were significantly higher in current smokers. %VO2max was inversely correlated with CO-Hb levels. Changing patterns in respiratory rate, respiratory equivalent and IC were significantly different between the two groups. Current smokers had rapid breathing, a greater respiratory equivalent and a limited increase in IC during exercise. Cigarette smoking diminishes the increase in dynamic IC in patients with type 2 diabetes. As this effect of smoking on dynamic changes in lung volume will exacerbate dynamic hyperinflation in cases complicated by chronic obstructive pulmonary disease, physicians should consider smoking habits and lung function when evaluating exercise capacity in patients with type 2 diabetes.
Authors:
Yoshihiro Kitahara; Noboru Hattori; Akihito Yokoyama; Kiminori Yamane; Kiyokazu Sekikawa; Tsutomu Inamizu; Nobuoki Kohno
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Hiroshima journal of medical sciences     Volume:  61     ISSN:  0018-2052     ISO Abbreviation:  Hiroshima J. Med. Sci.     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-08-24     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0421060     Medline TA:  Hiroshima J Med Sci     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  29-36     Citation Subset:  IM    
Affiliation:
Department of Molecular and Internal Medicine, Graduate School of Biochemical Sciences, Hiroshima University, Hiroshima, Japan. mayuchina@hotmail.co.jp
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