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Correspondence |

Diet and Exercise-Induced Bronchoconstriction FREE TO VIEW

Timothy D. Mickleborough, PhD; Martin R. Lindley, PhD
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Indiana University Bloomington, IN

Correspondence to: Timothy D. Mickleborough, PhD, Indiana University, Bloomington, Department of Kinesiology, 1025 E 7th St, HPER 112, Bloomington, IN 47404; e-mail: tmickleb@indiana.edu



Chest. 2006;130(2):623-624. doi:10.1378/chest.130.2.623-b
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To the Editor:

We read with great interest the review article in CHEST by Parsons and Mastronarde (December 2005)1 on exercise-induced bronchoconstriction (EIB) in athletes. We believe that the discussion on nonpharmacologic therapy omitted to mention a very promising area of research on the relationship between dietary factors and the severity of EIB.

There is accumulating evidence that dietary modification has the potential to reduce the severity and incidence of asthma and EIB.2 It has repeatedly been shown that a low-sodium diet reduces postexercise airway narrowing23 and moderates airway inflammation3in asthmatic subjects with EIB. It has also been shown that a 3-week fish oil diet, rich in omega-3 polyunsaturated fatty acids has a protective effect in suppressing EIB.45 In addition, antioxidant supplementation has also been shown to improve EIB to subclinical levels in significant numbers of individuals with EIB.2

The dietary factors mentioned above did not normalize postexercise pulmonary function in individuals with EIB. However, on average these dietary interventions did improve pulmonary function to below the clinical threshold of a 10% fall in postexercise FEV1, which is commonly used for diagnosis of EIB. This level of improvement is not unlike that attained with many pharmacologic treatments, which also do not necessarily normalize pulmonary function in EIB patients but do improve pulmonary function to subclinical levels. Thus, the potential for enhancing the quality of life for those individuals with EIB by dietary modification or supplementation is high.

These findings point toward the prophylactic and acute therapeutic effects of selected dietary factors, which seem to be attainable by simple rearrangement of nutritional components, in patients with inflammatory diseases such as asthma and EIB.2 It is also possible that any beneficial effect of diet on asthma and EIB is mediated through the combined effect of a variety of nutrients, rather than through any single nutrient.

The authors have reported to the ACCP that no significant conflicts of interest exist with any companies/organizations whose products or services may be discussed in this article.

Parsons, JP, Mastronarde, JG (2005) Exercise-induced bronchoconstriction in athletes.Chest128,3966-3974
 
Mickleborough, TD, Gotshall, RW Dietary components with demonstrated effectiveness in decreasing the severity of exercise-induced asthma.Sports Med2003;33,671-681
 
Mickleborough, TD, Lindley, MR, Ray, S Dietary salt, airway inflammation, and diffusion capacity in exercise-induced asthma.Med Sci Sports Exerc2005;37,904-914
 
Mickleborough, TD, Murray, RL, Ionescu, AA, et al Fish oil supplementation reduces severity of exercise-induced bronchoconstriction in elite athletes.Am J Respir Crit Care Med2003;168,1181-1189
 
Mickleborough, TD, Lindley, MR, Ionescu, AA, et al Protective effect of fish oil supplementation on exercise-induced bronchoconstriction in asthma.Chest2006;129,39-49
 

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References

Parsons, JP, Mastronarde, JG (2005) Exercise-induced bronchoconstriction in athletes.Chest128,3966-3974
 
Mickleborough, TD, Gotshall, RW Dietary components with demonstrated effectiveness in decreasing the severity of exercise-induced asthma.Sports Med2003;33,671-681
 
Mickleborough, TD, Lindley, MR, Ray, S Dietary salt, airway inflammation, and diffusion capacity in exercise-induced asthma.Med Sci Sports Exerc2005;37,904-914
 
Mickleborough, TD, Murray, RL, Ionescu, AA, et al Fish oil supplementation reduces severity of exercise-induced bronchoconstriction in elite athletes.Am J Respir Crit Care Med2003;168,1181-1189
 
Mickleborough, TD, Lindley, MR, Ionescu, AA, et al Protective effect of fish oil supplementation on exercise-induced bronchoconstriction in asthma.Chest2006;129,39-49
 
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