Variabilidade da frequência cardíaca: respostas agudas ao exercício isométrico – uma breve revisão

Abstract

This study aimed to perform a literature review related to the acute effects of isometric exercise (EI) on heart rate variability (HRV). A search was done for papers published in scientific journals indexed in the PubMed database. We selected for this study original articles that demonstrated acute effects of exercise in humans. However, IE generates autonomic alterations in several populations, being influenced by the variables intensity, duration of contraction, muscle volume involved, that can be evaluated with sensitivity by the HRV indexes. The indexes most used by the studies were in the time domain RMSSD and in the frequency domain LF, HF and HF / LF, such indices despite the sensitivity and limitations were able to express in diverse situations of IE, during exercise or recovery, differences between the populations, intensities, and muscular mass involved, showing in this way, applicability in evaluating the autonomic repercussions generated by the IE by means of autonomic HRV indexes.