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Exertional dyspnoea in obesity

Vipa Bernhardt, Tony G. Babb
European Respiratory Review 2016 25: 487-495; DOI: 10.1183/16000617.0081-2016
Vipa Bernhardt
1Dept of Health and Human Performance, Texas A&M University-Commerce, Commerce, TX, USA
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Tony G. Babb
2Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas and UT Southwestern Medical Center, Dallas, TX, USA
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  • For correspondence: TonyBabb@TexasHealth.org
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  • FIGURE 1
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    FIGURE 1

    Each dot represents a participant's rating (n=124) during the constant load submaximal exercise test at 60 W and during the incremental maximal exercise test at the 60 W stage. Dashed line represents line of identity. RPB: ratings of perceived breathlessness (Borg scale 0–10). Data from [7, 8] and unpublished data.

  • FIGURE 2
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    FIGURE 2

    Representation of a commonly used cardiopulmonary exercise testing protocol in our clinical patients showing two steady-state levels (4–5 min each), a rest period (∼15 min) and the incremental increase to volitional exhaustion (1 min each level until max).

  • FIGURE 3
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    FIGURE 3

    Frequency distribution of ratings of perceived breathlessness (RPB) in 171 otherwise healthy obese women. Data from [15, 16] and unpublished data.

  • FIGURE 4
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    FIGURE 4

    Relationship between dyspnoea ratings and minute ventilation (V′E) during an incremental cycling test. Data from 18 middle-aged obese and 13 age-matched non-obese women, and 68 obese women with and 55 obese women without dyspnoea on exertion (DOE) are presented. Data are presented as mean±se. Reproduced and modified from [30] with permission from the publisher.

  • FIGURE 5
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    FIGURE 5

    Retrospective analysis showing that the oxygen cost of breathing is similar between obese women with and without dyspnoea on exertion (DOE) (p>0.05).

  • FIGURE 6
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    FIGURE 6

    Schematic diagram of the potential psychophysiological mechanism of perception of breathlessness in obese adults with dyspnoea on exertion. 1: increased afferent feedback; 2: increased corollary discharge from the respiratory control centre; 3: decreased gating threshold for sensory transmission; 4: decreased or increased input from gating modifiers. V′O2: oxygen uptake; PaCO2: arterial carbon dioxide tension. Reproduced from [24] with permission from the publisher.

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European Respiratory Review: 25 (142)
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Exertional dyspnoea in obesity
Vipa Bernhardt, Tony G. Babb
European Respiratory Review Dec 2016, 25 (142) 487-495; DOI: 10.1183/16000617.0081-2016

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Exertional dyspnoea in obesity
Vipa Bernhardt, Tony G. Babb
European Respiratory Review Dec 2016, 25 (142) 487-495; DOI: 10.1183/16000617.0081-2016
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