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1 The John B. Pierce Laboratory, Departments of 2 Epidemiology and Public Health, and 3 Cellular and Molecular Physiology, Yale University School of Medicine, New Haven, Connecticut 06519; and 4 Women and Infants Hospital, Brown University School of Medicine, Providence, Rhode Island 02905
We tested the physiological reliability of
plasma renin activity (PRA) and plasma concentrations of arginine
vasopressin
(P[AVP]), aldosterone
(P[ALD]), and atrial
natriuretic peptide (P[ANP]) in the
early follicular phase and midluteal phases over the course of two
menstrual cycles (n = 9 women, ages 25 ± 1 yr). The reliability (Cronbach's 
0.80) of
these hormones within a given phase of the cycle was tested
1) at rest,
2) after 2.5 h of dehydrating
exercise, and 3) during a
rehydration period. The mean hormone concentrations were similar within
both the early follicular and midluteal phase tests; and the mean
concentrations of
P[ALD] and PRA for the
three test conditions were significantly greater during the midluteal
compared with the early follicular phase. Although Cronbach's for
resting and recovery P[ANP] were high (0.80 and 0.87, respectively), the resting and rehydration values for
P[AVP],
P[ALD], and PRA were
variable between trials for the follicular ( from 0.49 to 0.55) and
the luteal phase ( from 0.25 to 0.66). Physiological reliability was
better after dehydration for
P[AVP] and PRA but
remained low for
P[ALD]. Although
resting and recovery
P[AVP],
P[ALD], and PRA were not consistent within a given menstrual phase, the differences in the
concentrations of these hormones between the different menstrual phases
far exceeded the variability within the phases, indicating that the low
within-phase reliability does not prevent the detection of menstrual
phase-related differences in these hormonal variables.
aldosterone; renin; atrial natriuretic peptide; arginine vasopressin; estrogen; progesterone
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