Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/14208
Title: Exercise-induced dehydration alters pulmonary function but does not modify airway responsiveness to dry air in athletes with mild asthma
Authors: Simpson, AJ
Romer, LM
Kippelen, P
Keywords: airway hyper-responsiveness;eucapnic voluntary hyperpnea;exercise-induced bronchoconstriction;exercise-induced asthma;whole-body dehydration
Issue Date: 1-May-2017
Publisher: American Physiological Society
Citation: Simpson, A.J., Romer, L.M. and Kippelen, P. (2017) 'Exercise-induced dehydration alters pulmonary function but does not modify airway responsiveness to dry air in athletes with mild asthma', Journal of applied physiology, 122(5), pp. 1329-1335. doi: 10.1152/japplphysiol.01114.2016.
Abstract: Background: Local airway water loss is the main physiological trigger for exercise induced bronchoconstriction (EIB). Aim: To investigate the effects of whole-body water loss on airway responsiveness and pulmonary function in athletes with mild asthma and/or EIB. Methods: Ten recreational athletes with a doctor diagnosis of mild asthma and/or EIB completed a randomized, cross-over study. Pulmonary function tests (spirometry, whole body plethysmography and diffusing capacity for carbon monoxide [DLCO]) were conducted before and after three conditions: i) 2 h exercise in the heat with no fluid intake (dehydration); ii) 2 h exercise with ad libitum fluid intake (control); and iii) time-matched rest period (rest). Airway responsiveness was assessed 2 h post-exercise/rest via eucapnic voluntary hyperpnea (EVH) to dry air. Results: Exercise in the heat with no fluid intake induced a state of mild dehydration, with a mean body mass loss of 2.3±0.8% (SD). After EVH, airway narrowing was not different between conditions: median (interquartile range) maximum fall in forced expiratory volume in 1 sec was 13 (7–15)%, 11 (9–24)% and 12 (7–20)% in the dehydration, control and rest conditions, respectively. Dehydration caused a significant reduction in forced vital capacity (300±190 ml, P=0.001) and concomitant increases in residual volume (260±180 ml, P=0.001) and functional residual capacity (260±250 ml, P=0.011), with no change in DLCO. Conclusion: Mild exercise induced dehydration does not exaggerate airway responsiveness to dry air in athletes with mild asthma/EIB, but may affect small airway function.
URI: https://bura.brunel.ac.uk/handle/2438/14208
DOI: https://doi.org/10.1152/japplphysiol.01114.2016
1522-1601
ISSN: 8750-7587
Appears in Collections:Dept of Life Sciences Research Papers

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