Component
Perceived sleep quality
Perceived sleep quality. Species, exposure and limitations are retained in each linked claim.
1 recorded relationships. Experimental role, claim status and evidence remain attached to each record.
How nutrients influence it
Every nutrient with a recorded effect on this component, credited to the nutrient that acted rather than the chapter that recorded it. Open a nutrient to see the findings and the conditions they were measured under.
Other things that act on it
Enzymes, hormones, genes, and other components with a recorded effect. These are not nutrients, so they do not count toward the arrows above. Each finding names the chapter that recorded it.
How nutrients reach it in more than one step
Chains of two or more recorded steps that end here, grouped by the nutrient they start from. Each step is a separate finding, so a chain is a route a mechanism could take, not proof that it does.
Tracing routes…
What it does
Every recorded relationship this component is part of, grouped by its role. Plain wording comes first; the technical statement follows.
What acts on it
Immersion was associated with likely to very likely greater perceived quality of sleep on days 2 to 4 compared with the control week.
Experimental context and source evidence
- evidence_span
- {"source_cache": "artifacts/cold-research/21941017.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "0cd5dfad3441e660d67198cf010e5fa160936cb66c37b129b575d29d74940910", "start_char": 0, "end_char": 1567, "text_sha256": "0cd5dfad3441e660d67198cf010e5fa160936cb66c37b129b575d29d74940910"}
- experimental_model
- Eight highly trained swimmers over two matched training weeks in randomised order
- exposure
- 5 minutes of seated recovery at 15 degrees C after the last training session each day
- limitations
- A small crossover in elite athletes using magnitude-based inference. Sleep quality is self-reported.
- nutrient_topic
- Cold water immersion research collection; topical membership is not evidence of a direct clinical effect, and a therapeutic exposure is not a dietary intake. · Cold water immersion
- organism
- Human
- plain_language
- The swimmers reported sleeping better on the cold weeks.
- primary_references
- [cold-p21941017] Effect of daily cold water immersion on heart rate variability and subjective ratings of well-being in highly trained swimmers. (2012). https://pubmed.ncbi.nlm.nih.gov/21941017/ DOI: 10.1123/ijspp.7.1.33
- tissue_or_cell_type
- Autonomic nervous system and sleep
Cold water immersion: cold sensing, heat production, the catecholamine axis and what repeated exposure changes (2026-09-19) · lines 780–791
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Eight highly trained swimmers over two matched training weeks in randomised order · source_derived_draft · unverified_draft
### cold-sleep-quality Immersion was associated with likely to very likely greater perceived quality of sleep on days 2 to 4 compared with the control week. Condition category: normal nutrient_topic: Cold water immersion research collection; topical membership is not evidence of a direct clinical effect, and a therapeutic exposure is not a dietary intake. plain_language: The swimmers reported sleeping better on the cold weeks. organism: Human tissue_or_cell_type: Autonomic nervous system and sleep experimental_model: Eight highly trained swimmers over two matched training weeks in randomised order limitations: A small crossover in elite athletes using magnitude-based inference. Sleep quality is self-reported. exposure: 5 minutes of seated recovery at 15 degrees C after the last training session each day evidence_span: {"source_cache": "artifacts/cold-research/21941017.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "0cd5dfad3441e660d67198cf010e5fa160936cb66c37b129b575d29d74940910", "start_char": 0, "end_char": 1567, "text_sha256": "0cd5dfad3441e660d67198cf010e5fa160936cb66c37b129b575d29d74940910"} [cold-p21941017] Effect of daily cold water immersion on heart rate variability and subjective ratings of well-being in highly trained swimmers. (2012). https://pubmed.ncbi.nlm.nih.gov/21941017/ DOI: 10.1123/ijspp.7.1.33
Complete structured claim and evidence
The events it takes part in
A mechanism often involves more than two components. These are the full events, with every participant and its role.
Situations it appears in
Low-supply and faulty-machinery situations recorded in the chapters where this component plays a part.
In the sources
Preserved passages that mention this component, quoted exactly. Open one to read it in context.
Open hypotheses
Proposed ideas that involve this component. They are labeled as hypotheses and do not change any recorded statement.
This is a research prototype built from draft material. It is not medical advice, and its statements still await verification against the original studies.