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The self-perception of dyspnoea threshold during the 6-min walk test: a good alternative to estimate the ventilatory threshold in chronic obstructive pulmonary disease.

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Title: The self-perception of dyspnoea threshold during the 6-min walk test: a good alternative to estimate the ventilatory threshold in chronic obstructive pulmonary disease.
Authors: Couillard, Annabelle1, Tremey, Emilie2, Prefaut, Christian3, Varray, Alain4, Heraud, Nelly2 nelly.heraud@5-sante.fr
Source: International Journal of Rehabilitation Research. Dec2016, Vol. 39 Issue 4, p320-325. 6p.
Subject Terms: *Self-evaluation, Dyspnea, Exercise tests, Heart beat, Obstructive lung diseases, Regression analysis, Research evaluation, Anaerobic threshold
Abstract: To determine and/or adjust exercise training intensity for patients when the cardiopulmonary exercise test is not accessible, the determination of dyspnoea threshold (defined as the onset of self-perceived breathing discomfort) during the 6-min walk test (6MWT) could be a good alternative. The aim of this study was to evaluate the feasibility and reproducibility of self-perceived dyspnoea threshold and to determine whether a useful equation to estimate ventilatory threshold from self-perceived dyspnoea threshold could be derived. A total of 82 patients were included and performed two 6MWTs, during which they raised a hand to signal self-perceived dyspnoea threshold. The reproducibility in terms of heart rate (HR) was analysed. On a subsample of patients (n = 27), a stepwise regression analysis was carried out to obtain a predictive equation of HR at ventilatory threshold measured during a cardiopulmonary exercise test estimated from HR at selfperceived dyspnoea threshold, age and forced expiratory volume in 1 s. Overall, 80% of patients could identify selfperceived dyspnoea threshold during the 6MWT. Selfperceived dyspnoea threshold was reproducibly expressed in HR (coefficient of variation = 2.8%). A stepwise regression analysis enabled estimation of HR at ventilatory threshold from HR at self-perceived dyspnoea threshold, age and forced expiratory volume in 1 s (adjusted r = 0.79, r² = 0.63, and relative standard deviation = 9.8 bpm). This study shows that a majority of patients with chronic obstructive pulmonary disease can identify a self-perceived dyspnoea threshold during the 6MWT. This HR at the dyspnoea threshold is highly reproducible and enable estimation of the HR at the ventilatory threshold. [ABSTRACT FROM AUTHOR]
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Database: Education Research Complete
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Abstract:To determine and/or adjust exercise training intensity for patients when the cardiopulmonary exercise test is not accessible, the determination of dyspnoea threshold (defined as the onset of self-perceived breathing discomfort) during the 6-min walk test (6MWT) could be a good alternative. The aim of this study was to evaluate the feasibility and reproducibility of self-perceived dyspnoea threshold and to determine whether a useful equation to estimate ventilatory threshold from self-perceived dyspnoea threshold could be derived. A total of 82 patients were included and performed two 6MWTs, during which they raised a hand to signal self-perceived dyspnoea threshold. The reproducibility in terms of heart rate (HR) was analysed. On a subsample of patients (n = 27), a stepwise regression analysis was carried out to obtain a predictive equation of HR at ventilatory threshold measured during a cardiopulmonary exercise test estimated from HR at selfperceived dyspnoea threshold, age and forced expiratory volume in 1 s. Overall, 80% of patients could identify selfperceived dyspnoea threshold during the 6MWT. Selfperceived dyspnoea threshold was reproducibly expressed in HR (coefficient of variation = 2.8%). A stepwise regression analysis enabled estimation of HR at ventilatory threshold from HR at self-perceived dyspnoea threshold, age and forced expiratory volume in 1 s (adjusted r = 0.79, r² = 0.63, and relative standard deviation = 9.8 bpm). This study shows that a majority of patients with chronic obstructive pulmonary disease can identify a self-perceived dyspnoea threshold during the 6MWT. This HR at the dyspnoea threshold is highly reproducible and enable estimation of the HR at the ventilatory threshold. [ABSTRACT FROM AUTHOR]
ISSN:03425282
DOI:10.1097/MRR.0000000000000191