Activity Cycles (also known as Activity Cycle, Cycle, Activity): 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 a

NIH MeSH · D000204Phenomena and Processes

Activity Cycles

Also known asActivity Cycle · Cycle, Activity · Cycles, Activity

Definition

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 classification

  • G07.180.562.797.500

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Common questions about Activity Cycles

What does Activity Cycles mean in medicine?
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. This definition is taken from the National Library of Medicine's MeSH (Medical Subject Headings) 2026 release, which is the standard vocabulary used to index PubMed and most medical literature.
Is Activity Cycles known by any other names?
Yes. Activity Cycles is also referred to as Activity Cycle, Cycle, Activity, Cycles, Activity in different clinical, research and patient-facing contexts. The MeSH descriptor groups all of these synonyms under a single canonical concept so research and records stay consistent.
Where does Activity Cycles sit in the medical classification?
Activity Cycles falls under the broader medical category "Phenomena and Processes" in the MeSH hierarchy (tree numbers: G07.180.562.797.500). Browsing the related concepts on this page takes you to neighbouring topics in the same branch of medicine.
Where can I get a plain-language explanation of Activity Cycles?
For a plain-language explanation of Activity Cycles - including symptoms, treatments and what it means for an Indian patient - ask GoDavaii's Health AI. It works in 22+ Indian languages, is free and needs no signup. Tap "Ask GoDavaii AI about Activity Cycles" above.

Source: NIH MeSH 2026 (D000204) — National Library of Medicine, public domain. View official MeSH record ↗