Prolonged recovery from exercise-induced asthma with increasing age in childhood.

Abstract:

:It has been suggested that children with asthma recover more quickly from exercise-induced bronchoconstriction than adults. On the basis of clinical observation we hypothesized that recovery rate from exercise-induced asthma (EIA) in childhood also decreases with age. In 14 children (aged 7-12 years) with a history of EIA, we measured spontaneous recovery from bronchoconstriction induced by two different stimuli: exercise and histamine. The children visited the laboratory three times. After a screening exercise test on the first visit, standardized bronchoprovocation tests with either exercise or histamine were performed on the following two visits in random order. The degree of bronchoconstriction induced by histamine was matched for that observed after exercise. During recovery, forced expiratory volume in 1 second (FEV1) was measured repeatedly up to 2 hours postchallenge. The recovery rate (% increase in FEV1/min) was calculated from the linear slope of the time-response curve. Differences in recovery rate between the two stimuli were analyzed by paired t-test, and age-related differences were analyzed using multiple regression analysis. For the group as a whole, recovery rate was not different between the two stimuli (mean +/- SD: 1.22 +/- 0.91 for exercise, and 1.46 +/- 0.65, for histamine, P = 0.31). However, the recovery rate for exercise-induced bronchoconstriction decreased significantly with age (r = -0.74, P = 0.003), in contrast to the recovery rate for histamine (r = -0.15, P = 0.60). Consequently, in the oldest age group (11-12 years, n = 5) recovery rate from exercise challenge was significantly slower than in the younger age group (7-10 years, n = 9), i.e., 0.54 +/- 0.17 and 1.60 +/- 0.93, respectively, P = 0.009, and slower than the recovery rate from histamine challenge: 0.54 +/- 0.17 and 1.33 +/- 0.54, respectively, P = 0.03. In the younger age group the recovery rates from exercise and histamine were not different (1.60 +/- 0.93 and 1.54 +/- 0.73, respectively, P = 0.83). We conclude that recovery from EIA in childhood decreases with increasing age. These data suggest that the mechanism of exercise-induced asthma in childhood changes with age. This might be due to changes in mediator production or response to mediator release.

journal_name

Pediatr Pulmonol

journal_title

Pediatric pulmonology

authors

Hofstra WB,Sterk PJ,Neijens HJ,Kouwenberg JM,Duiverman EJ

doi

10.1002/ppul.1950200309

subject

Has Abstract

pub_date

1995-09-01 00:00:00

pages

177-83

issue

3

eissn

8755-6863

issn

1099-0496

journal_volume

20

pub_type

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