Abstract
Estimation of breathlessness during exercise by the use of either the visual analogue scale (VAS) or the modified Borg scale is reported to be highly stable over time periods ranging from minutes to weeks (1,6,8,9). Such reproducibility is essential both for clinical studies of the efficacy of pharmacological intervention on the sensations of breathlessness in patients and also in mechanistic studies of the effects of dyspnogenic agents in healthy volunteers. Recent studies however, in both normal subjects and patients with chronic obstructive lung disease, have shown poor reproducibility (4,5,10) and thrown doubt on the basic validity of the measurement.
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Reed, J.W., Feisal Subhan, M.M. (1995). Effect of Repetitive Testing on Breathlessness. In: Semple, S.J.G., Adams, L., Whipp, B.J. (eds) Modeling and Control of Ventilation. Advances in Experimental Medicine and Biology, vol 393. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-1933-1_25
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DOI: https://doi.org/10.1007/978-1-4615-1933-1_25
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