PMID: 8434350Jan 1, 1993Paper

Effect of arterial oxygen desaturation on six minute walk distance, perceived effort, and perceived breathlessness in patients with airflow limitation

Thorax
V H MakS G Spiro

Abstract

The effect of exercise induced hypoxaemia in determining submaximal exercise capacity, perceived breathlessness, and perceived exertion is not known. The purpose of this study was to investigate the relation of these variables to the results of lung function tests and the degree of hypoxaemia during submaximal exercise in patients with airflow limitation. Forty two patients with chronic obstructive airways disease and 28 patients with chronic severe asthma were studied. Spirometry was performed and gas transfer (TLCO) and lung volumes were measured. Submaximal exercise capacity was assessed with a standardised six minute walk test. Arterial oxygen desaturation during the walk test was monitored by a portable pulse oximeter. Patients rated their perceived degree of respiratory impairment on a Medical Research Council (MRC) breathlessness scale before the walk. Perceived breathlessness was measured by means of a linear visual analogue scale and exertion on the Borg scale after the walk. The six minute walk distance was strongly correlated (r value) with TLCO (0.68), peak expiratory flow (PEF: 0.55), forced expiratory volume in one second (FEV1: 0.53), transfer coefficient KCO: 0.49), age (-0.49), and forced vital capacity (FVC: 0...Continue Reading

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Related Concepts

Asthma
Dyspnea
Lung
Lung Diseases, Obstructive
Dioxygen
Respiratory Function Tests
Exercise, Isometric

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