Acute cardiovascular responses to slow and deep breathing in normotensive non-pregnant and pregnant women
Malika Felton, Stephanie Grigsby, Vanora A. Hundley
High blood pressure during pregnancy can threaten both mother and baby, yet medication is not always welcome. This study asks whether changing the pace of breathing can briefly bring the pregnant heart’s responses closer to those seen outside pregnancy. Pregnancy lowers the baseline amplitude of respiratory sinus arrhythmia, but slow and deep breathing can raise it to the level seen in non-pregnant women during spontaneous breathing. The surprising part is how strongly breathing frequency matters.