Caída del flujo espiratorio máximo inducida por el ejercicio en niños asmáticos asintomáticos: Estudio comparativo entre carrera libre y carrera en tapiz rodante.
Caída del flujo espiratorio máximo inducida por el ejercicio en niños asmáticos asintomáticos: Estudio comparativo entre carrera libre y carrera en tapiz rodante.
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Background. The exercise-induced bronchoconstriction (EIB) is recognized as an indirect measure of non-specific bronchial responsiveness; it has been used as an epidemiological tool for diagnosing asthma, as a measure of the severity of the disease, and as a tool to monitor the effect of asthma therapy. Treadmill running (TRT) is an objective, viable and easy method to assess EIB, but the equipment necessary for its fulfiliment isn't available in all centers.
Objective. The aim of this study was to assess possible differences in post-exercise peak expiratory flow rate (PEFR) between treadmill (TRT) and free running provocation test (FRT) in asthmatic patients.
Design. A randomized crossover clinical trial.
Patients and methods. Both tests were performed separately in a random order by 32 asthmatic patients, keeping similar environmental conditions, except ambient temperature, which was significantly lower in free running provocation test (p<0.001).
Results. Maximum reduction in PEFR and its return to baseline values occurred earlier when TRT was done. However, for the PEFR values recorded before, after the exercise challenge, and after the administration of 200mg of salbutamol, there were no significant differences between either of the provocation tests. The mean per cent increase in heart rate was significantly greater when TRT was done (p<0.05).
Conclusions. We conclude that treadmill and free running provocation tests can be used interchangeably in order to follow asthmatic patients.
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