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. 2021 Mar 30;12:652029. doi: 10.3389/fphys.2021.652029

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Copyright © 2021 Estévez-González, Donadio, Cobo-Vicente, Fernández-Luna, Sanz-Santiago, Villa Asensi, Iturriaga Ramirez, Fernández-del-Valle, Diez-Vega, Larumbe-Zabala and Pérez-Ruiz.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Effects of a short-term resistance-training program on heart rate variability (HRV) in children with cystic fibrosis. (A) LF, low frequency band; (B) HF, high frequency band; (C) LF/HF ratio; (D) SDNN, standard deviation of R-R intervals; (E) PNN50, percentage of successive R-R intervals that differ by more than 50 ms; and (F) RMSSD, root mean square of successive differences between normal heartbeats. ms, milliseconds; nu, normalized units; CON, control group; EX, exercise group. Data presented as mean and standard deviation. Differences were analyzed using a two-way analysis of variance (ANOVA) with repeated measures. *Indicates significant differences when p < 0.05.