Elevated heart rate variability in physically active postmenopausal women: a cardioprotective effect?
Davy KP, Miniclier NL, Taylor JA, Stevenson ET, Seals DR. Elevated heart rate variability in physically active postmenopausal women: a cardioprotective effect? Am J Physiol. 1996 Aug; 271(2 Pt 2):H455-60.