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Effects of human pregnancy on fluid regulation responses to short-term exercise

¹School of Physical and Health Education, and Departments of ²Physiology, and ³Obstetrics and Gynaecology, Queen's University, Kingston, Ontario, Canada K7L 3N6

Submitted 24 October 2002 ; accepted in final form 8 August 2003

This study tested the hypothesis that human pregnancy alters fluid and electrolyte regulation responses to acute short-term exercise. Responses of 22 healthy pregnant women (PG; gestational age, 37.0 ± 0.2 wk) and 17 nonpregnant controls (CG) were compared at rest and during cycling at 70 and 110% of the ventilatory threshold (VT). At rest, ANG II concentration was significantly (P < 0.05) higher in PG vs. CG, whereas plasma osmolality and concentrations of AVP, sodium, and potasium were significantly lower. Atrial natriuretic peptide concentration at rest was similar between groups. ANG II and AVP concentrations increased significantly from rest to 110% VT in CG only, whereas increases in atrial natriuretic peptide concentration were similar between groups. Increases in osmolality, and total protein and albumin concentrations from rest to both work rates were similar between the two groups. PG and CG exhibited similar shifts in fluid during acute short-term exercise, but the increases in ANG II and AVP were absent and attenuated, respectively, during pregnancy. This was attributed to the significantly augmented fluid volume state already present at rest in late gestation.

angiotensin II; arginine vasopressin; atrial natriuretic peptide; progesterone; osmolality

This article has been cited by other articles:

				C. A. Brown, C. T. Lee, S. M. J. Hains, and B. S. Kisilevsky Maternal Heart Rate Variability and Fetal Behavior in Hypertensive and Normotensive Pregnancies Biol Res Nurs, October 1, 2008; 10(2): 134 - 144. [Abstract] [PDF]