Effects of individualized resistance training prescription with heart rate variability on muscle strength, muscle size and functional performance in older women

Author(s)

Bittencourt, Diego ; de Oliveira, Ramon Martins ; da Silva, Deivid Gomes ; Bergamasco, Joao Guilherme Almeida ; Cesar, Marcelo de Castro ; Jacomassi, Daniela Godoi ; de Camargo, Julio Benvenutti Bueno ; Kingsley, J. Derek ; Libardi, Cleiton Augusto

• Document type: Journal article
• Source: FRONTIERS IN PHYSIOLOGY; v. 15, p. 9-pg., 2024-12-17.

Abstract

Introduction: This study aimed to investigate whether individualizing autonomic recovery periods between resistance training (RT) sessions (IND) using heart rate variability (HRV), measured by the root mean square of successive R-R interval differences (RMSSD), would lead to greater and more consistent improvements in muscle strength, muscle mass, and functional performance in older women compared to a fixed recovery protocol (FIX). Methods: Twenty-one older women (age 66.0 +/- 5.0 years old) were randomized into two different protocols (IND: n = 11; FIX: n = 10) and completed 7 weeks of RT. Measurements of RMSSD were performed within a five-day period to establish baseline values. The RMSSD values determined whether participants were recovered from the previous session. The assessments included muscle cross-sectional area (CSA), one-repetition maximum (1RM), peak torque (PT), rate of force development (RFD), chair stand (CS), timed up and go (TUG), 6-minutes walking (6MW), and maximum gait speed (MGS). Results: There were no significant (P > 0.05) group vs. time interactions. There were significant main effects of time (P < 0.05) for CSA, 1RM, PT, TUG, CS, 6MW, and MGS, while no significant changes were observed for RFD (P > 0.05). Conclusion: IND does not seem to enhance responses in muscle mass, strength, and functional performance compared FIX in healthy older women. (AU)

• FAPESP's process: 23/04739-2 - RESISTANCE TRAINING PROGRESSION: EFFECTS ON THE REMODELING OF THE EXTRACELLULAR MATRIX IN HUMANS
• Grantee: Cleiton Augusto Libardi
• Support Opportunities: Regular Research Grants
• FAPESP's process: 16/25401-6 - Effect of individualized manipulation of the recovery interval between the resistance training sessions in muscular hypertrophy and force
• Grantee: Deivid Gomes da Silva
• Support Opportunities: Scholarships in Brazil - Scientific Initiation