Phenomena and Processes

Activity Cycles

Bouts of physical irritability or movement alternating with periods of quiescence. It includes biochemical activity and hormonal activity which may be cellular. These cycles are shorter than 24 hours and include sleep-wakefulness cycles and the periodic activation of the digestive system.

National Library of MedicineMedical Subject Headings2026

Structured Summary

Abstract

Bouts of physical irritability or movement alternating with periods of quiescence. It includes biochemical activity and hormonal activity which may be cellular. These cycles are shorter than 24 hours and include sleep-wakefulness cycles and the periodic activation of the digestive system.

MeSH Record

Classification

Broader headings

Related Concepts

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MeSH Record

Synonyms

3 entry terms
  • Activity Cycle
  • Cycle, Activity
  • Cycles, Activity

MeSH Record

Aspects Covered

6 allowable subheadings

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

MeSH Record

History Note

91(75); was see under CIRCADIAN RHYTHM 1975-90

MeSH Hierarchy

Tree Number

  1. G07.180.562.797w.500

MeSH Record

NLM Classification

QT 167

AMA Style

References

  1. National Library of Medicine. Activity Cycles. Medical Subject Headings (MeSH). 2026. Unique ID D000204. http://id.nlm.nih.gov/mesh/2026/D000204
  2. Activity Cycles. In: Wikidata. https://www.wikidata.org/wiki/Q71129343