There is increasing evidence to suggest many elite athletes fail to recognise and report symptoms of exercise-induced bronchoconstriction (EIB), supporting the contention that athletes should be screened routinely for EIB.
To screen elite British athletes for EIB using eucapnic voluntary hyperpnoea (EVH).
228 elite athletes provided written informed consent and completed an EVH challenge with maximal flow volume loops measured at baseline and 3, 5, 10 and 15 min following EVH. A fall of 10% in forced expiratory volume in 1 s (FEV(1)) from baseline was deemed positive. Two-way analysis of variance was conducted to compare FEV(1) at baseline and maximal change following EVH between EVH-positive and EVH-negative athletes who did and did not report a previous diagnosis of EIB. Significance was assumed if p ≤0.05.
Following the EVH challenge 78 athletes (34%) demonstrated EVH positive. 57 out of the 78 (73%) athletes who demonstrated EVH positive did not have a previous diagnosis of EIB. 30 athletes reported a previous diagnosis of asthma, nine (30%) of whom demonstrated EVH negative. There was no significant difference between the magnitude of the fall in FEV(1) between athletes who reported a previous diagnosis of EIB and demonstrated EVH positive, and those with no previous diagnosis of EIB who demonstrated EVH positive (mean±SD; -21.6 ± 16.1% vs -17.1 ± 9.7%; p=0.07).
The high proportion of previously undiagnosed athletes who demonstrated EVH positive suggests that elite athletes should be screened routinely for EIB using a suitable bronchoprovocation challenge.
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on extensive measurements, from very low frequency to 1 MHz, and in a
physical criterion to validate measurement results. A methodology and a
computational procedure to determine the frequency and the transient
behavior of grounding systems, and the effects of such behavior on
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considers, in correct way, soil electrical characteristics and the
treatment of electromagnetic behavior of grounding systems, including
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Electromagnetic Compatibility, 1997. IEEE 1997 International Symposium on; 09/1997
[Show abstract][Hide abstract] ABSTRACT: This article reviews the diagnostic challenge methods-both exercise and surrogate-for diagnosis of exercise-induced bronchoconstriction (EIB) and EIB with known asthma. Indirect challenges that release the entire repertoire of mediators representative of EIB and asthma are more specific for diagnosis and are recommended over direct challenges such as methacholine challenge, which are sensitive but nonspecific. Self-reported history and empiric therapeutic trials are not adequate for diagnosis of EIB with or without known asthma. Objective pulmonary function documentation with bronchodilator reversibility or exercise or surrogate challenge are optimal for diagnosis of EIB or EIB with known asthma. Such objective pulmonary function documentation is optimal for the proper management and healthy lifestyle of the exercising athlete or individual.
Current Allergy and Asthma Reports 09/2011; 11(6):482-90. DOI:10.1007/s11882-011-0225-4 · 2.77 Impact Factor
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