Humidity prevents the exercise-induced formation of hydrogen peroxide and nitrite in exhaled breath condensate in recrea
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ORIGINAL ARTICLE
Humidity prevents the exercise‑induced formation of hydrogen peroxide and nitrite in exhaled breath condensate in recreational cyclists Felipe Contreras‑Briceño1,2 · Maximiliano Espinosa‑Ramirez2 · Ginés Viscor1 · Oscar F. Araneda3 Received: 26 January 2020 / Accepted: 31 July 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Purpose The aerobic exercise affects the respiratory redox-state. The influence of different relative humidity (RH) levels on the formation of respiratory reactive chemical species associated with redox-state altered by exercise has been poorly explored. Our aim was to evaluate the effect of two different RH conditions (40% vs. 90%) on the concentration of hydrogen peroxide and nitrite in exhaled breath condensate ( [H2O2]EBC and [ NO2−]EBC) and spirometry parameters in recreational cyclists. Methods Sixteen men and women (12/4) (mean age ± SD: 23.5 ± 2.2 years) completed 60-min of cycling at 166.3 ± 26.9 watts ̇ 2-max. test, 49.3 ± 7.6 mL·min−1·kg−1) at random 40%-RH and 90%-RH conditions separated (70% of maximum load of VO by 7 days. The two-way RM-ANOVA test was applied to compare [H2O2]EBC, [NO2−]EBC, [NO2−]EBC/[NO2−]Plasma at rest and 80-min post-exercise (80-post); and spirometry parameters at rest, 20-post and 80-post. Results The interaction of factors (humidity × time) was significant in [H2O2]EBC, [NO2−]EBC, [NO2−]EBC/[NO2−]Plasma (p = 0.005, p = 0.030, p = 0.043, respectively). At 40%-RH conditions, the same parameters were higher in 80-post than at rest (p
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