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Copyright ©ERS Journals Ltd 2003
Shortburst oxygen immediately before and after exercise is ineffective in nonhypoxic COPD patients
1 Respiratory Services, Green Lane Hospital, and 2 Dept of Medicine, Faculty of Health Sciences, University of Auckland, Auckland, New Zealand
CORRESPONDENCE: C.A. Lewis, Respiratory Services, Green Lane Hospital, Green Lane West, Auckland, New Zealand. Fax: 64 96310712. E-mail: clewis@adhb.govt.nz
Keywords: chronic obstructive pulmonary disease, exertional dyspnoea, shortburst oxygen, 6-min walk test
Received: March 12, 2003
Accepted May 23, 2003
The study was supported by a research grantfrom the Auckland Medical Research Foundation. C.A. Lewis' research fellowship wasfunded by an educational grant from GlaxoSmithKline New Zealand Ltd.
Shortburst oxygen therapy (SBOT) remains an unproven treatment for reduction of exertional dyspnoea in chronic obstructive pulmonary disease (COPD). This study aimed to assess whether SBOT before exercise reduces dyspnoea or improves performance, and whether SBOT after exercise reduces dyspnoea during recovery.
Twentytwo clinically stable COPD patients (mean forced expiratory volume in one second 34% predicted, mean resting saturation 94%) attended a respiratory gymnasium and undertook four 6-min walk (6MW) tests at each of two sessions, 1 week apart. Cylinder air or oxygen was administered singleblind in random order for 5 min prior to the first two 6MW and during recovery following the final two 6MW. Dyspnoea was selfrated by subjects using the modified Borg scale.
There was no significant difference in mean 6MW distance or final Borg score for air and oxygen given before exercise. There was also no significant difference in mean timetoresting Borg score for air and oxygen given after exercise. Only two subjects demonstrated a clinically significant and consistent reduction in dyspnoea for oxygen compared with air either before or after exercise.
Overall, shortburst oxygen therapy neither reduced dyspnoea nor improved performance. This study does not support the use of shortburst oxygen therapy either immediately before or after exercise.
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