{
  "frozenAtUtc": "2026-11-07T10:52:23Z",
  "question": "In adults performing aerobic exercise, how closely do wrist-worn optical heart-rate devices agree with concurrent ECG?",
  "publicationBounds": {
    "from": "2010-01-01",
    "through": "2026-11-07"
  },
  "searchDate": "2026-11-07",
  "design": "Bounded purposive evidence synthesis; not a systematic review or exhaustive search",
  "eligibility": [
    "Primary human validation in adults",
    "Wrist optical pulse sensing with concurrent ECG comparator",
    "Aerobic exercise measurements separable from rest",
    "Inspectable Methods sufficient to identify population, device and criterion procedure"
  ],
  "exclusions": [
    "Reviews and search snippets as primary evidence",
    "Chest-strap-only comparator without ECG",
    "Children-only cohorts",
    "Energy-expenditure claims",
    "Current-device recommendations inferred from historical models"
  ],
  "retrievalPlan": "Reconcile RX0326 history first; targeted PubMed/PMC/publisher queries for ECG aerobic exercise primary validations; aim for 3\u20136 accessible studies without replacing eligibility to meet a quota. Screen source-specific correction/retraction metadata and exact-identity notice queries. Stop with explicit access limits if blocked.",
  "plannedQueries": [
    "site:pubmed.ncbi.nlm.nih.gov wrist heart rate accuracy ECG aerobic exercise validation",
    "site:pmc.ncbi.nlm.nih.gov wrist heart rate accuracy ECG exercise validation"
  ],
  "analysis": "Narrative, outcome-specific comparison; no pooled effect estimate; repeated readings are not independent participants. Missingness, timing, comparator procedure, firmware and subgroup representativeness constrain inference.",
  "reviewStatus": "Independent agent scientific review pending; qualified external review pending.",
  "canonicalChanges": "None"
}