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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]
Copyright of International Journal of Rehabilitation Research is the property of Lippincott Williams & Wilkins and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Education Research Complete
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PubType: Academic Journal
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Rehabilitation+Research%22">International Journal of Rehabilitation Research</searchLink>. Dec2016, Vol. 39 Issue 4, p320-325. 6p.
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  Data: 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]
– Name: AbstractSuppliedCopyright
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  Group: Ab
  Data: <i>Copyright of International Journal of Rehabilitation Research is the property of Lippincott Williams & Wilkins and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1097/MRR.0000000000000191
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        Text: English
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      – SubjectFull: Exercise tests
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      – SubjectFull: Heart beat
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      – SubjectFull: Research evaluation
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      – SubjectFull: Anaerobic threshold
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      – TitleFull: 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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            NameFull: Couillard, Annabelle
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              M: 12
              Text: Dec2016
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              Y: 2016
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