Abstract
The effect of low frequency breathing compared with spontaneous breathing was examined at rest and during exercise (40 watts) in 12 patients suffering from severe chronic obstructive bronchitis. At rest low frequency breathing improved significantly the alveolar ventilation and the tensions of oxygen and carbon dioxide in the arterial blood. There was no significant change in ventilation minute volume. During exercise low frequency breathing significantly decreased ventilation minute volume, and there was no significant improvement in gas exchange. The decrease in ventilation during low frequency breathing at 40 watts compared with spontaneous breathing at the same lung volume was due to expiratory flow limitation. The findings suggest that this technique may impair exercise tolerance in patients with severe chronic obstructive bronchitis.
Full text
PDF
Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Grimby G., Stiksa J. Flow-volume curves and breathing patterns during exercise in patients with obstructive lung disease. Scand J Clin Lab Invest. 1970 May;25(3):303–313. doi: 10.3109/00365517009046210. [DOI] [PubMed] [Google Scholar]
- MOTLEY H. L. THE EFFECTS OF SLOW DEEP BREATHING ON THE BLOOD GAS EXCHANGE IN EMPHYSEMA. Am Rev Respir Dis. 1963 Oct;88:484–492. doi: 10.1164/arrd.1963.88.4.484. [DOI] [PubMed] [Google Scholar]
- Mueller R. E., Petty T. L., Filley G. F. Ventilation and arterial blood gas changes induced by pursed lips breathing. J Appl Physiol. 1970 Jun;28(6):784–789. doi: 10.1152/jappl.1970.28.6.784. [DOI] [PubMed] [Google Scholar]
- Thoman R. L., Stoker G. L., Ross J. C. The efficacy of pursed-lips breathing in patients with chronic obstructive pulmonary disease. Am Rev Respir Dis. 1966 Jan;93(1):100–106. doi: 10.1164/arrd.1966.93.1.100. [DOI] [PubMed] [Google Scholar]