• S van Buuren, E H J Hulzebos, K Valkenet, E Lindeman, and N L U van Meeteren.
• Netherlands Organisation for Applied Scientific Research TNO, Leiden, The Netherlands; University of Utrecht, Utrecht, The Netherlands. Electronic address: stef.vanbuuren@tno.nl.
• Physiotherapy. 2014 Jun 1;100(2):128-33.

ObjectivesTo develop a reference chart to monitor inspiratory muscle strength during pre-operative inspiratory muscle training for patients at high risk of developing postoperative pulmonary complications awaiting coronary artery bypass graft (CABG) surgery.DesignSecondary data analysis using patients from the intervention arm of a randomised clinical trial.SettingUniversity medical centre.ParticipantsPatients at high risk of developing postoperative pulmonary complications awaiting CABG surgery.InterventionsPatients performed inspiratory muscle training seven times per week for at least 2 weeks before surgery.Main Outcome MeasuresMaximal inspiratory muscle strength.ResultsA new reference chart was produced using a non-linear time trend model with a normal error structure.ConclusionsThe chart is a novel tool for monitoring the progress of inspiratory muscle training for physiotherapy practice. Wider use of this chart is recommended.Copyright © 2013 Chartered Society of Physiotherapy. Published by Elsevier Ltd. All rights reserved.

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