RESUMEN
OBJETIVO: determinar el efecto de una prueba aeróbica de natación en piscina clorada indoor sobre la concentración de NO2-, H2O2 y el pH en el condensado del aire espirado. MÉTODO: diez nadadores aficionados nadaron 2,5 km en piscina clorada. Se obtuvieron muestras antes y en cuatro oportunidades durante las ocho horas posteriores a la prueba. El análisis estadístico usó modelos mixtos y la prueba de Spearman RESULTADOS: la prueba se realizó a 74,99 ± 10,10 % de la reserva cardíaca y duró 50,80 ± 8,98 minutos. Posterior a la prueba disminuyó el NO2- (p = 0,04) y el pH (p = 0,02) en el condensado del aire espirado. Los valores pre-ejercicio se relacionaron con los cambios absolutos p = 0,0002, p = 0,047 y con el volumen de entrenamiento p = 0,017, p = 0,077 para NO2- y H2O2 respectivamente. CONCLUSIONES: la natación en piscina clorada disminuye la concentración de NO2- y el pH en el condensado del aire espirado
OBJECTIVE: to determine the effect of an aerobic swimming test in chlorinated indoor swimming pool on the concentration of NO2-, H2O2 and the pH in the exhaled breath condensate. METHODS: ten amateur swimmers swam 2,5 km in a chlorinated pool. Samples were obtained before and four times in the eight hours after the test. The statistical analysis used mixed models and the Spearman test. RESULTS: the test was performed at 74,99 ± 10,10 % of the cardiac reserve and lasted 50,80 ± 8,98 minutes. After the test the NO2- (p = 0,04) and the pH (p = 0,02) in the exhaled air condensate decreased. The pre-exercise values were related to the absolute changes p = 0,0002, p = 0.047 and with the training volume p = 0,017, p = 0.077 for NO2- and H2O2 respectively. CONCLUSIONS: Swimming in a chlorinated pool decreases the NO2-concentration and the pH in the exhaled breath condensate
Asunto(s)
Humanos , Masculino , Femenino , Adolescente , Adulto Joven , Adulto , Natación/fisiología , Espiración/fisiología , Ejercicio Físico/fisiología , Pruebas Respiratorias/métodos , Concentración de Iones de Hidrógeno , Nitritos , Piscinas , Pulmón/metabolismo , Oxidantes/metabolismo , Consumo de Oxígeno/fisiologíaRESUMEN
Exercise promotes pulmonary oxidative imbalance. In this regard, some evidence has been obtained from the study of exhaled breath condensate (EBC) during urban races, in which the factors involved in the occurrence of this process are still not characterized. In this paper, under laboratory conditions, both the role of time of exercise on the generation of pro-oxidants (H2O2, NO2-) and pH have been assessed in EBC of 16 under-trained subjects who completed three tests of cycloergometric exercise at low intensity (30 % of VO2 max) with a duration of 10, 30, and 90 min. Samples were obtained as follows: immediately before and at 80 min post exertion in each test. In the 90-min test, an increase in H2O2, NO2- concentration in EBC at 80 min post exertion with no changes in the pH was observed. Total O2 consumption and total ventilation weakly correlated with the changes in H2O2 and NO2-. In conclusion, the concentration of pro-oxidants in the EBC depends on the duration of the exercise when it is performed at low intensity under laboratory conditions (AU)
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Asunto(s)
Humanos , Masculino , Adolescente , Adulto Joven , Adulto , Oxidantes/metabolismo , Pulmón/metabolismo , Mucosa Respiratoria/metabolismo , Ejercicio Físico , Frecuencia Respiratoria , Peróxido de Hidrógeno/metabolismo , Factores de Tiempo , Nitritos/metabolismo , Consumo de Oxígeno , Ciclismo , Pruebas Respiratorias , Eliminación PulmonarRESUMEN
It is a well-established fact that exercise increases pro-oxidants and favors oxidative stress; however, this phenomenon has been poorly studied in human lungs. Pro-oxidative generation (H2O2, NO2 −), lipid peroxidation markers (MDA), and inflammation (pH) in exhaled breath condensate (EBC) have been determined through data from 10 active subjects who ran 10 km; samples were obtained immediately before, at 20, and at 80 min post-exertion. In EBC, the concentration of H2O2at 80 min post-exertion was increased. NO2 − concentration showed a tendency to increase at 80 min post-exertion, with no variations in MDA and pH. No variations of NO2 − were found in plasma, while there was an increase of NO2 − at 80 min post-exertion in the relation between EBC and plasma. NO2 − in EBC did not correlate to plasmatic NO2 −, while it did correlate directly with H2O2 in EBC, suggesting a localized origin for the exercise-related NO2 − increase in EBC. MDA in plasma did not increase nor correlate with MDA in EBC. In conclusion, high-intensity exercise increases lung-originated pro-oxidants in non-athlete subjects with no evidence of early lipid peroxidation and changes in the pH value in EBC