Disturbance of circadian rhythm in blood pressure by lack of darkness at night

J. Siegelová, B. Fišer, Z. Brázdová, M. Forejt, P. Homolka, P. Vank, A. Havelková, J. Hollan, Germaine G Cornelissen-Guillaume, F. Halberg

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


The aim of the study was to verify whether exposure to light at night was associated with disturbances of circadian variability of blood pressure in comparison to usual dark at night in healthy subjects. Nine subjects were recruited for 48-h ambulatory blood pressure monitoring. Systolic and diastolic blood pressure was measured three times per hour during the day and one time per hour at night. During the first night the subjects slept in darkness, during the second night the bedroom was illuminated. Our result shows that the illumination of bedroom at night increases systolic blood pressure by about 11 mmHg. Long lasting increase of systolic blood pressure could be connected with an increase of risk of cardiovascular diseases like stroke and myocardial infarction.

Original languageEnglish (US)
Pages (from-to)147-154
Number of pages8
JournalScripta Medica Facultatis Medicae Universitatis Brunensis Masarykianae
Issue number3
StatePublished - Dec 1 2006


  • Blood pressure
  • Circadian rhythm
  • Light at night as a risk of cardiovascular disease


Dive into the research topics of 'Disturbance of circadian rhythm in blood pressure by lack of darkness at night'. Together they form a unique fingerprint.

Cite this