Brazilian Journal of Pulmonology

ISSN (on-line): 1806-3756 | ISSN (printed): 1806-3713

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Cardiorespiratory response to incremental progressive maximal exercise in asthmatic patients

Resposta cardiorrespiratória na asma induzida pelo exercício máximo com incrementos progressivos

Ruy Amazonas Lamar Filho, Antonio Augusto Soares da Fonseca, Maria Alice Melo Neves, Laércio Moreira Valença

J Bras Pneumol.2001;27(3):137-142

Abstract PDF PT

Objective: To determine the occurrence of exercise-induced bronchoconstriction and analyze cardiorespiratory response during maximal exercise in asthmatic patients. Patients and methods: Fourteen subjects with asthma (FEV1 of 86.3% predicted), as defined by the American Thoracic Society criteria were submitted to a maximal exercise test. Volume-flow curves were performed prior to progressive maximal exercise and seven and 15 minutes after it. Six patients (43%) showed a decline in FEV1 equal or greater than 15% after exercise (group I). The remaining patients constituted group II. Group I showed a FEV1 fall of 40.9% and 26.7%, seven and 15 minutes after exercise, respectively. In group II, there was a decrease of 2.6%, after 7 min and an increase of 1.2% after 15 min. At peak exercise, both groups reached heart rate above 91% of reference values; peak work was 82.7% and 62.5%, VO2max (mL/kg/min) 93.5% and 58,9% and VEmax 91.5% and 63.8%, respectively, in groups I and II. These differences were statistically significant. The correlation between the FEV1 fall rate (7 min post-exercise) and VEmax (% predicted) has showed a coefficient r = 0.8989 in group I and r = 0.3629 in group II. There was no correlation between delta VEF1 and VO2max (% predicted) in both groups. These findings showed that, in exercise-induced asthma patients, the occurrence of bronchoconstriction correlated with the level of maximal ventilation, but not with physical fitness.

 


Keywords: Exercise induced asthma. Bronchoconstriction. Tidal volume. Respiratory function tests.

 


 

 


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