{"id":"a8482889-c62c-54f3-a672-7e7be10397d5","stable_key":"b3c3f45a-50fb-5b79-98d7-5e5228df00db:cold-sleep-quality","predicate":"increases","statement":"Immersion was associated with likely to very likely greater perceived quality of sleep on days 2 to 4 compared with the control week.","claim_class":"observational","status":"source_derived_draft","evidence_grade":"ungraded","direction":"positive","is_public":true,"mechanism_event_id":"d3228c70-0288-5a9b-95d1-17181c7831f1","mechanism_event_label":"The swimmers reported sleeping better on the cold weeks.","subject":{"id":"96a7dff2-caf4-51c1-93c4-c9ed08c05c9a","slug":"cold-water-immersion","display_name":"Cold water immersion","entity_type_key":"drug"},"object":{"id":"7c286459-08a3-5b4c-99cf-494edaeadd2e","slug":"perceived-sleep-quality","display_name":"Perceived sleep quality","entity_type_key":"cellular_process"},"evidence_count":1,"mechanism_event":{"id":"d3228c70-0288-5a9b-95d1-17181c7831f1","stable_key":"b3c3f45a-50fb-5b79-98d7-5e5228df00db:cold-sleep-quality-event","event_type":"observed_intervention","label":"The swimmers reported sleeping better on the cold weeks.","description":"Immersion was associated with likely to very likely greater perceived quality of sleep on days 2 to 4 compared with the control week.","status":"provisional","compartment":null,"participants":[{"entity":{"id":"96a7dff2-caf4-51c1-93c4-c9ed08c05c9a","slug":"cold-water-immersion","display_name":"Cold water immersion","entity_type_key":"drug"},"role":"subject","stoichiometry":null,"state_label":"","sequence_order":0,"notes":""},{"entity":{"id":"7c286459-08a3-5b4c-99cf-494edaeadd2e","slug":"perceived-sleep-quality","display_name":"Perceived sleep quality","entity_type_key":"cellular_process"},"role":"target","stoichiometry":null,"state_label":"","sequence_order":1,"notes":""}]},"contexts":[{"dimension":"evidence_span","value_text":"{\"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\"}","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"experimental_model","value_text":"Eight highly trained swimmers over two matched training weeks in randomised order","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"exposure","value_text":"5 minutes of seated recovery at 15 degrees C after the last training session each day","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"limitations","value_text":"A small crossover in elite athletes using magnitude-based inference. Sleep quality is self-reported.","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"nutrient_topic","value_text":"Cold water immersion research collection; topical membership is not evidence of a direct clinical effect, and a therapeutic exposure is not a dietary intake.","comparator":null,"unit":null,"notes":"","entity":{"slug":"cold-water-immersion","display_name":"Cold water immersion","entity_type_key":"drug"}},{"dimension":"organism","value_text":"Human","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"plain_language","value_text":"The swimmers reported sleeping better on the cold weeks.","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"primary_references","value_text":"[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","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"tissue_or_cell_type","value_text":"Autonomic nervous system and sleep","comparator":null,"unit":null,"notes":"","entity":null}],"evidence":[{"id":"ad28edf7-b02e-51d3-a91e-5fc563ae5390","evidence_kind":"source_excerpt","locator":"Lines 780-791","start_line":780,"end_line":791,"excerpt":"### cold-sleep-quality\nImmersion was associated with likely to very likely greater perceived quality of sleep on days 2 to 4 compared with the control week.\nCondition category: normal\nnutrient_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.\nplain_language: The swimmers reported sleeping better on the cold weeks.\norganism: Human\ntissue_or_cell_type: Autonomic nervous system and sleep\nexperimental_model: Eight highly trained swimmers over two matched training weeks in randomised order\nlimitations: A small crossover in elite athletes using magnitude-based inference. Sleep quality is self-reported.\nexposure: 5 minutes of seated recovery at 15 degrees C after the last training session each day\nevidence_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\"}\n[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","model_system":"Eight highly trained swimmers over two matched training weeks in randomised order","directness":"author_interpretation","verification_status":"source_derived_draft","notes":"Exact curation-document quotation, not publisher quotation. Study 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","relationship":"supports","weight":1.0,"link_notes":"","source":{"id":"feeccadc-1392-573e-a0b5-0939ee5de6e2","stable_key":"import-b3c3f45a-50fb-5b79-98d7-5e5228df00db","title":"Cold water immersion: cold sensing, heat production, the catecholamine axis and what repeated exposure changes (2026-09-19)","document_type":"imported_text","citation_label":"AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text.","file_path":"","sha256":"557f074d372c49c502c34e648651aff7ebf2c8816305d2d2f08e338a7e96a5f0","revision_id":"ecc19e8d-40db-5b5d-b98e-0507f645976c","review_status":"unverified_draft","notes":""}}],"relations":[],"conflicts":[],"corrections":[],"research":null}