No abstract available
MeSH terms
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Administration, Inhalation
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Exercise Therapy*
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Gases / administration & dosage*
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Helium / administration & dosage*
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Humans
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Oxygen / administration & dosage*
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Positive-Pressure Respiration / methods*
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Pulmonary Disease, Chronic Obstructive / rehabilitation*
Substances
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Gases
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Helium
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heliox
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Oxygen