Phenomena and Processes

Circadian Rhythm

The regular recurrence, in cycles of about 24 hours, of biological processes or activities, such as sensitivity to drugs or environmental and physiological stimuli.

National Library of MedicineMedical Subject Headings2026

Structured Summary

Abstract

The regular recurrence, in cycles of about 24 hours, of biological processes or activities, such as sensitivity to drugs or environmental and physiological stimuli.

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Synonyms

20 entry terms
  • Nycthemeral Rhythm
  • Nyctohemeral Rhythm
  • Twenty-Four Hour Rhythm
  • Circadian Rhythms
  • Nycthemeral Rhythms
  • Nyctohemeral Rhythms
  • Rhythm, Circadian
  • Rhythm, Nycthemeral
  • Rhythm, Nyctohemeral
  • Rhythm, Twenty-Four Hour
  • Rhythms, Circadian
  • Rhythms, Nycthemeral
  • Rhythms, Nyctohemeral
  • Rhythms, Twenty-Four Hour
  • Twenty Four Hour Rhythm
  • Twenty-Four Hour Rhythms
  • Diurnal Rhythm
  • Diurnal Rhythms
  • Rhythm, Diurnal
  • Rhythms, Diurnal

MeSH Record

Aspects Covered

5 allowable subheadings

Indexed with the subheadings drug effects, genetics, immunology, physiology, radiation effects.

MeSH Record

Indexing Annotation

drug administration based on circadian rhythm = DRUG CHRONOTHERAPY: do not coordinate with CIRCADIAN RHYTHM or DRUG ADMINISTRATION SCHEDULE; jet lag: index JET LAG SYNDROME

MeSH Record

History Note

66(64); DIURNAL RHYTHM was see under CIRCADIAN RHYTHM 1975-85 (Prov 1969-74)

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References

  1. National Library of Medicine. Circadian Rhythm. Medical Subject Headings (MeSH). 2026. Unique ID D002940. http://id.nlm.nih.gov/mesh/2026/D002940
  2. Circadian Rhythm. In: Wikipedia. https://en.wikipedia.org/wiki/Circadian_rhythm
  3. Circadian Rhythm. In: Wikidata. https://www.wikidata.org/wiki/Q208353