Efeitos do treinamento resistido na variabilidade da frequência cardiaca em idosos do Programa Idoso Feliz Participa Sempre (PIFPS)

Abstract

Heart rate variability (HRV) is a sensitive marker of autonomic modulation and cardiovascular adaptation to exercise. This study aimed to analyze the acute effects of resistance training on HRV in older adults participating in the Idoso Feliz Participa Sempre (PIFPS) Program. Twenty-four elderly participants (67.4 ± 4.2 years) were assessed at rest and after a resistance training session. HRV was measured using a Polar H10 transmitter and analyzed in the time (RMSSD, SDNN), frequency (LF/HF), and nonlinear (SD1, SD2) domains using Kubios HRV 3.4.3 software. The mean RR interval decreased (830.6 → 694.9 ms), while mean heart rate (73.4 → 87.5 bpm) and stress index (30.2 → 38.9) increased, indicating sympathetic predominance after exercise. SD1 increased and SD2 decreased, suggesting enhanced short-term variability and reduced long-term modulation. In conclusion, resistance training acutely alters cardiac autonomic modulation, with immediate sympathetic predominance and partial vagal recovery, highlighting the role of resistance exercise in cardiovascular regulation among older adults.