Can a 15-hour (Overnight) Urinary Catecholamine Measure Substitute for a 24-hour Measure?
Janicki-Deverts, J., Zilles, K., Cohen, S., & Baum, A. This study examined whether 15-hr and 24-hr urinary catecholamine measures show comparable associations with other physiological measures that are expected to correlate with sympathetic nervous system activity. Participants (193 healthy adults) provided 24-hr urine samples that were collected in a controlled environment (hotel), and divided into 9-hr daytime and 15-hr overnight collections. On the same day, resting blood pressure (BP) was measured, and 8 samples of salivary cortisol were collected. Catecholamine (15-hr and 24-hr) measures were correlated substantially in the entire sample, and when examined separately by sex and by race. Both 15-hr and 24-hr epinephrine (E) correlated significantly with systolic BP and cortisol; 15-hr and 24-hr norepinephrine (NE) correlated significantly with cortisol. Correlation coefficients for 15-hr measures were similar, but not equivalent to those for 24-hr measures. Urinary catecholamines o
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