Gonçalves, Ana Clara, Carlos Marcelo Pastre, Vitor Engrácia Valenti, Luiz Carlos de Abreu, & Luiz Carlos Marques Vanderlei. " Acute effects of resistance exercise on heart rate variability in cardiopathic patients: cross-sectional study." International Archives of Medicine [Online], 8 (2015): n. pag. Web. 20 Sep. 2020