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. 2020 Oct 5;7(1):e000694. doi: 10.1136/bmjresp-2020-000694

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© Author(s) (or their employer(s)) 2020. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Schematic of trial design. Diagram illustrating the research journey for a trial participant, from their recruitment and giving of informed consent to completing study day one: baseline outcome measures (OMs) followed by randomisation to intervention (rest or airway clearance therapy (ACT)) and postintervention OMs. The time gap in-between visits should be no longer than 3 months. On study day 2, the participant completes the same OMs before and after the other intervention. Participation in the study is then complete.