Objective: To observe changes in the aerobic power in a group of asthmatic children after of a physical training in warm-water pool (EFPC).Method: 22 asthmatic children, who were divided in to an experimental group (GE) and a control group (GC) of 11 each.The GE was submitted to an EFPC for 18 weeks in a controlled way, while the GC only did their daily activities.Treadmill ergometer testing were conducted to both groups, to determine the maximal oxygen consumption in MET and the maximum heart rate (FCM).Each section of the EFPC was measure to check if Children?children presented exercise-induced asthma (AIE).Results: At the beginning of the study, the average of METs and of the FCM were similar in both groups (Anova METs p = 0.5568; Anova FCM p = 0.5198; METs: GE 11.61 ± 2.33 DS, GC 11.05 ± 2.08 DS; FCM: GE 165.09 ± 13.85 DS, GC 161.46 ± 12.12 DS).At the end, only the GE improved in the averages of the difference between the pre-post test, both in the METs and in the FCM, according to the tests of paired observations (METs GE 6.65 ± 3.46 DS; Anova p = 0.0006).The FCM also increased, but acceptably in the GE (FCM: GE 22.45 ± 19.04 DS; Anova FCM p = 0.0823).Only the 6,06% of the measure have AIE.Conclusion: a significant increase of the aerobic capacity in the GE was found compared to the GC.It is suggested that the use of a warm-water pool for asthmatic's physical training can decrease the AIE.