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A person who breathes entirely through the nose regardless of the exercise level. Such a person may switch to breathing oro-nasally (partly through the nose and partly through the mouth) when the ventilation rate is greater than the reference value for heavy exercise (3 m<sup>3</sup> h<sup>–1</sup>).
''ICRP Glossary entry - June 2019''
'''Return to [[ICRP Glossary|Glossary]] entry - June 2019'''
