The effect of learning on ventilatory responses to inspiratory threshold loading in COPD

Gavin A Sturdy; David R Hillman; Daniel J Green; Sue C Jenkins; Nola M Cecins; Peter R Eastwood

doi:10.1016/j.rmed.2003.07.005

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The effect of learning on ventilatory responses to inspiratory threshold loading in COPD

Journal article

Open access

Peer reviewed

The effect of learning on ventilatory responses to inspiratory threshold loading in COPD

Gavin A Sturdy, David R Hillman, Daniel J Green, Sue C Jenkins, Nola M Cecins and Peter R Eastwood

Respiratory medicine, Vol.98(1), pp.1-8

2004

DOI: https://doi.org/10.1016/j.rmed.2003.07.005

PMID: 14959807

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Abstract

Inspiratory muscles

Respiratory muscle endurance

Respiratory muscle strength

Background: Progressive threshold loading (PTL) is a common test of respiratory muscle endurance. Healthy naı̈ve subjects improve endurance with successive exposures to PTL by altering their breathing responses, thus necessitating a familiarization period before reproducible measures can be obtained. This study sought to determine whether a similar “learning effect” is evident in patients with COPD, and what the mechanism of any such effect may be. Methods: Ten subjects with COPD (FEV1 34±13% predicted) underwent PTL on four occasions (>24 h apart). During PTL measurements were obtained of breathing pattern and maximum threshold pressure (Pthmax) achieved. Maximum inspiratory pressure (PImax) was measured on each occasion. Results: Over the four tests PImax improved by 21±16% (sd) (P<0.05) and Pthmax by 32±21% (P<0.05) with a plateau in these measures achieved by test three. Pthmax/PImax was unchanged, being 61±11% at test one and 67±12% at test four. In contrast to healthy subjects, PTL was not associated with increased expiratory time or decreased end-expiratory lung volume. Conclusions: In contrast to PImax and Pthmax, which changed with successive tests, a single measure of the ratio Pthmax/PImax may present a useful guide to the endurance capacity of the respiratory muscles in patients with COPD.

Details

Title: The effect of learning on ventilatory responses to inspiratory threshold loading in COPD
Authors/Creators: Gavin A Sturdy - Sir Charles Gairdner Hospital
David R Hillman - Sir Charles Gairdner Hospital
Daniel J Green - The University of Western Australia
Sue C Jenkins - Sir Charles Gairdner Hospital
Nola M Cecins - Sir Charles Gairdner Hospital
Peter R Eastwood - Sir Charles Gairdner Hospital
Publication Details: Respiratory medicine, Vol.98(1), pp.1-8
Publisher: Elsevier Ltd
Identifiers: 991005592648607891
Murdoch Affiliation: Vice Chancellery
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration
Citation topics: 1 Clinical & Life Sciences; 1.65 Allergy; 1.65.192 COPD
Web Of Science research areas: Cardiac & Cardiovascular Systems; Respiratory System
ESI research areas: Clinical Medicine