Key result
Higher-intensity inspiratory muscle training preserves heart rate variability over lower-intensity training in hospitalized heart failure.
Why the study?
The immediate effects of inspiratory muscle training at different loads on the autonomic modulation of heart rate in hospitalized heart failure patients required verification.
Does a single 15-minute session of inspiratory muscle training at 60% of maximum inspiratory pressure improve immediate heart rate variability compared to a 30% load in hospitalized patients with heart failure?
RCT (n=21)
Single-blind (assessor-blinded)
Computer-generated random allocation (randomizer.org)
No
Does a single 15-minute session of inspiratory muscle training at 60% of maximum inspiratory pressure improve immediate heart rate variability compared to a 30% load in hospitalized patients with heart failure?
In hospitalized patients with heart failure, a single session of inspiratory muscle training at 60% of maximum inspiratory pressure preserved heart rate variability, whereas a 30% load acutely worsened autonomic modulation.
Low-load inspiratory training may worsen acute HRV in hospitalized HF; leaves open optimal dosing for autonomic outcomes in larger trials.
The objective of this study was to verify the immediate effects on the autonomic modulation of post-IMT heart rate with different loads in individuals hospitalized with heart failure. A randomized, prospective, controlled and blind clinical trial was carried out, with the participation of patients over 40 years of age, hospitalized with heart failure. The maximum inspiratory pressure was evaluated to obtain the load for inspiratory muscle training (IMT) and analysis of the autonomic modulation of heart rate with the frequency meter. They were divided into Group 60% and Group 2 30% and underwent a training protocol for 15 minutes. Participants in the 60% Group did not have a major influence on their HRV, while the 30% Group showed a worsening of their HRV after the IMT. It was concluded that the practice of physical exercise using IMT protocols with higher loads is associated with good cardioprotection.
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Rocha et al. (2026) conducted an RCT in Hospitalized heart failure (n=21). Inspiratory muscle training (IMT) at 60% of maximal inspiratory pressure (MIP) vs. Inspiratory muscle training (IMT) at 30% of maximal inspiratory pressure (MIP) for 15 minutes was evaluated on Autonomic modulation of heart rate (heart rate variability LF/HF ratio post-IMT) (p=0.03). Inspiratory muscle training at 60% MIP preserved heart rate variability, whereas 30% MIP worsened time-domain HRV parameters (RMSSD p=0.02, SDNN p=0.04) in hospitalized heart failure patients.
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