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. 2011 Sep 12;1(2):e000184. doi: 10.1136/bmjopen-2011-000184

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© 2011, Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions.

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-commercial License, which permits use, distribution, and reproduction in any medium, provided the original work is properly cited, the use is non commercial and is otherwise in compliance with the license. See: http://creativecommons.org/licenses/by-nc/2.0/ and http://creativecommons.org/licenses/by-nc/2.0/legalcode.

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Traces drawn based on digital data obtained every 0.2 s from the impulse oscillometry measurement. The respiratory cycle was separated into inspiration and expiration according to spontaneous airflow data (upper panel), and quartile time fractions 1 to 4 and 5 to 8 were labelled. The lower panel is an example of impulse oscillometry data assigned to eight fractions of Rrs at 5 Hz (R5).