PMID: 9167891May 1, 1997Paper

Variability in the period of the blood pressure circadian rhythm in human beings

Chronobiology International
G AbitbolM Mechkouri

Abstract

In studies and assessments of human beings done in natural settings, it is assumed that the period tau of circadian rhythms, including ones of systolic (SBP) and diastolic (DBP) blood pressure, is equal to 24 hours. To test this hypothesis, SBP and DBP rhythms were studied in 112 medication-free, non-hospitalized subjects (62 males, 47.1 + 2.0 years [x +/- SEM], and 50 females, 54.5 +/- 2.1 years) by 48 h ambulatory blood pressure monitoring (ABPM). Of these, 26 were hypertensive (diurnal SBP > 140 mmHg and diurnal DBP > 90 mmHg) and 86 normotensive. All subjects were synchronized by their habitual daytime activities from approximately 08:00 h to approximately 23:00 h +/- 1 h and by sleep at night. The BP was assessed at 15-minute intervals during a continuous 48h span using a Spacelabs model #90207 ABPM. The time series data of each subject were individually evaluated by power spectra analysis for the prominent tau of the SBP and DBP rhythms. The prominent tau differed from 24 hours in 22/112 subjects for SBP and in 16/112 subjects for DBP. Generally, in these individuals the tau was less than 24 hours. The occurrence of non-24 h tau's was more frequent in hypertensive than normotensive subjects; the difference between the gro...Continue Reading

References

Jan 1, 1988·European Journal of Applied Physiology and Occupational Physiology·A ReinbergA Bicakova-Rocher
Jun 1, 1988·Hypertension·G D JamesJ H Laragh
Jul 1, 1984·The American Journal of Cardiology·M A WeberF A Wyle
Jun 1, 1993·American Journal of Hypertension·J A StaessenA Amery

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Citations

Sep 3, 2002·Journal of the American College of Cardiology·Ramón C HermidaJosé E López
Mar 11, 2004·The Journal of Clinical Hypertension·Ramomicronn C HermidaManuel Iglesias
Jan 4, 2003·Chronobiology International·Ramón C HermidaDiana E Ayala

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