Effect of different intensities of inspiratory muscle exercise on cardiac autonomic control in the post-exercise recovery in healthy adults: a controlled and randomized study
DOI:
https://doi.org/10.1590/Keywords:
Breathing Exercise, Autonomic System, Heart Rate Variability.Abstract
This study aimed to investigate the effect of different
intensities of Inspiratory Muscle Exercise (IME) on cardiac autonomic
control during the period of post-exertion recovery in healthy
adults. Thus, an experimental, controlled, and randomized study
was conducted with 15 men aged from 18 to 40 years, including
sedentary and healthy individuals. Participants underwent four IME
sessions: a sham session, followed by sessions with 30%, 40%, and
60% of maximal inspiratory pressure. Pulse intervals were recorded
using digital infrared photoplethysmography to obtain heart rate
(HR) values. Measurements included HR, interbeat interval, standard
deviation of all normal RR intervals (SDNN), root mean square
of successive differences between adjacent normal RR intervals
(RMSSD), percentage of adjacent RR intervals greater than 50ms
(pNN50) (time domain), total power, power of low-frequency
spectral bands (LF), and power of high-frequency spectral bands
(HF) (ms²), LF and HF (n.u.), and LF/HF (frequency domain). These
measures were assessed simultaneously for 10 minutes at rest
and during recovery period (15, 30, 45, and 60 minutes). Twoway
analysis of variance was used, considering a 5% significance
level. We observed that RMSSD and pNN50 showed higher values
compared to baseline (Time Effect: P=0.004; P<0.01, respectively).
No differences were found in HRV measures in the frequency domain
(Time Effect: P>0.05). Additionally, there was no difference in the
comparison between intensities for all HRV measures (Session Effect:
p>0.05). We conclude that, regardless of the applied load, there is a
similar increase in parasympathetic cardiac autonomic modulation
indices in the post-IME recovery period in healthy adults
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Copyright (c) 2024 Pedro Lima Souza, Leila Dal Poggetto Moreira, Lilian Pinto da Silva, Vinicius Faria Weiss Weiss, Pedro Augusto Carvalho Mira, Patrícia Fernandes Trevizan, Mateus Camaroti Laterza, Daniel Godoy Martinez
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