Cited by 95Circadian rhythm and melatoninBlood Pressure and Hypertension StudiesHeart Rate Variability and Autonomic Control

Absence of endogenous circadian rhythmicity in blood pressure?

Kerkhof, G·1998·American Journal of Hypertension

Abstract

Currently available evidence reveals a predominant role of exogenous (so-called "masking") factors in the 24 h variation of blood pressure in humans. The existence of a (minor) endogenous circadian factor cannot be excluded, however. This possibility was tested by applying the rigorous unmasking conditions of the constant-routine protocol, that is, strict bed rest in a separate bedroom, total sleep deprivation, constant ambient temperature and illumination, and hourly equicaloric food and liquid intake. Twenty-five normotensive young individuals were subjected to a 26 h constant-routine procedure while hourly measurements were made of their blood pressure and heart rate. Repeated-measures analysis of variance failed to show a significant 24 h variation of blood pressure. The power of this test appeared satisfactorily high (>0.95). Heart rate, however, exhibited a significant circadian pattern, with a range of 6.7 beats/min (10% of the 24 h mean value). Moreover, the timing of the 24 h heart rate curves differed significantly between so-called morning (n = 10) and evening (n = 9) individuals. Mean peak values for the morning-types occurred at 11 AM, for the evening types nearly 6 h later. In conclusion, no evidence was found for the involvement of a circadian oscillator in the regulation of blood pressure.

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Crossref · 10.1016/s0895-7061(97)00461-5

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Authors
Kerkhof, G.
Affiliations
Leiden University (NL)
Corresponding author
Kerkhof, G
Venue
American Journal of Hypertension
Published
1998-03
Volume
11
Issue
3
Pages
373-377
ISSN
0895-7061 (ISSN-L)
OpenAlex
W2087806624
Cited by
95
References
29
Citations by year
2026: 1 · 2025: 1 · 2023: 2 · 2022: 1 · 2021: 3 · 2020: 2 · 2019: 2 · 2018: 6 · 2017: 2 · 2016: 5 · 2015: 1 · 2014: 1 · 2013: 3 · 2012: 9
FWCI
0.97
Type
journal article
Language
en
Open access
closed
Locations
  • American Journal of Hypertension (publishedVersion)
  • PubMed (publishedVersion)
  • UvA-DARE (University of Amsterdam) (publishedVersion)
  • Data Archiving and Networked Services (DANS) (submittedVersion)
Topics
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Blood Pressure and Hypertension Studies
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Heart Rate Variability and Autonomic Control
Keywords
circadian rhythm, blood pressure, heart rate, sleep deprivation, circadian clock
MeSH terms
Adult, Bed Rest, Blood Pressure, Circadian Rhythm, Diastole, Environment, Controlled, Female, Heart Rate, Humans, Male, Systole, Wakefulness

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