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A person who breathes oro-nasally (partly through the nose and partly through the mouth) at all levels of exercise: sleep, sitting light exercise and heavy exercise. At 'heavy exercise' such a person inhales a greater fraction of air through the mouth than a nasal augmenter.
''ICRP Glossary entry - June 2019''
'''Return to [[ICRP Glossary|Glossary]] entry - June 2019'''