Table. 1—

Abbreviated list of database search terms

DatabaseSearch terms
PubMedCOPD, COAD, pulmonary emphysema and associated MeSH termsHelioxExerciseDyspnoea
Ovid/MedlineCOPD with associated MeSH termsDyspnoeaExercise and associated MeSH termsHeliox and associated MeSH terms
ScopusCOPD, COAD, pulmonary emphysema and associated MeSH termsDyspnoea or dyspneaExercise or physical exerciseHeliox
Web of Science (Web of Knowledge)COPD, COAD, pulmonary emphysema and associated MeSH termsDyspnoea or dyspneaExercise or physical exerciseHeliox
CINAHL (EBSCOhost)COPD, COAD, pulmonary emphysema and associated MeSH termsDyspnoea and associated MeSH termsExercise, physical exercise and associated MeSH termsHeliox
Academic Search File (EBSCOhost)COPD, COAD, pulmonary emphysema and associated MeSH termsDyspnoea and associated MeSH termsExercise, physical exercise and associated MeSH termsHeliox
EMBASE 1974 to presentCOPD and associated MeSH termsDyspnoeaExercise and associated MeSH termsHeliox and associated MeSH terms
All EBM reviewsCOPD and associated MeSH termsDyspnoeaExercise and associated MeSH termsHeliox and associated MeSH terms