{
  "date": "2026-11-07",
  "boundaryFile": "protocol.json",
  "strategy": "Purposive targeted search, no database export, pagination or exhaustive screening. Publication bounds applied during candidate selection, not query syntax. Search-index dates and snippets are unverified discovery metadata.",
  "queries": [
    {
      "capture": "native-01",
      "operation": "system2_search_query",
      "requestJsonPointer": "/request/system2_search_query/0",
      "arguments": {
        "q": "site:pubmed.ncbi.nlm.nih.gov wrist heart rate accuracy ECG aerobic exercise validation"
      }
    },
    {
      "capture": "native-01",
      "operation": "system2_search_query",
      "requestJsonPointer": "/request/system2_search_query/1",
      "arguments": {
        "q": "site:pmc.ncbi.nlm.nih.gov wrist heart rate accuracy ECG exercise validation"
      }
    },
    {
      "capture": "native-05",
      "operation": "system2_search_query",
      "requestJsonPointer": "/request/system2_search_query/0",
      "arguments": {
        "q": "\"Validity of wrist-worn consumer products to measure heart rate and energy expenditure\" doi"
      }
    },
    {
      "capture": "native-05",
      "operation": "system2_search_query",
      "requestJsonPointer": "/request/system2_search_query/1",
      "arguments": {
        "q": "\"Accuracy of wearable heart rate monitors in cardiac rehabilitation\" ECG"
      }
    },
    {
      "capture": "native-08",
      "operation": "system2_search_query",
      "requestJsonPointer": "/request/system2_search_query/0",
      "arguments": {
        "q": "\"10.3390/jpm7020003\" correction erratum retraction",
        "domains": [
          "pubmed.ncbi.nlm.nih.gov",
          "pmc.ncbi.nlm.nih.gov",
          "mdpi.com"
        ]
      }
    },
    {
      "capture": "native-08",
      "operation": "system2_search_query",
      "requestJsonPointer": "/request/system2_search_query/1",
      "arguments": {
        "q": "\"10.21037/cdt.2019.06.05\" correction erratum retraction",
        "domains": [
          "pubmed.ncbi.nlm.nih.gov",
          "pmc.ncbi.nlm.nih.gov",
          "cdt.amegroups.org"
        ]
      }
    },
    {
      "capture": "native-08",
      "operation": "system2_search_query",
      "requestJsonPointer": "/request/system2_search_query/2",
      "arguments": {
        "q": "\"10.21037/cdt.2019.04.08\" correction erratum retraction",
        "domains": [
          "pubmed.ncbi.nlm.nih.gov",
          "pmc.ncbi.nlm.nih.gov",
          "cdt.amegroups.org"
        ]
      }
    }
  ],
  "counts": {
    "nativeCalls": 9,
    "searchOperations": 7,
    "openOperations": 22,
    "allOperations": 29,
    "returnedSearchBlocks": 75,
    "primaryCandidatesAttempted": 6,
    "coreIncluded": 3,
    "coreFreshMethods": 2,
    "coreRetainedMethods": 1,
    "additionalPrimaryMethodsReadButEligibilityHeld": 1,
    "newNoticeBodiesRead": 1,
    "registryBodiesRead": 0,
    "canonicalGateChanges": 0
  },
  "stopReason": "Three eligible ECG studies with inspectable Methods obtained; six targeted primary candidates attempted. Accessible evidence was enough for a narrow, explicitly historical narrative; inaccessible newer candidates limit currency. No claim of saturation or exhaustive coverage.",
  "selectedCandidates": [
    {
      "pmid": "28538708",
      "decision": "include S1",
      "reason": "Adult exercise ECG; retained Methods/Results hash reconciled."
    },
    {
      "pmid": "31555543",
      "decision": "include S2",
      "reason": "Adult treadmill ECG; complete main Methods inspected."
    },
    {
      "pmid": "31275816",
      "decision": "include S3",
      "reason": "Adult rehabilitation exercise ECG; complete main Methods inspected and identified erratum read."
    },
    {
      "pmid": "29942628",
      "decision": "hold; no outcome synthesis",
      "reason": "Publisher Methods available but minimum participant age not stated (mean 22, SD 3 cannot prove adult-only). Table labels negative values MAPE and apparent level-scale limits of agreement; no quantitative extraction."
    },
    {
      "pmid": "41157371",
      "decision": "hold; no outcome synthesis",
      "reason": "Initial PMC metadata/abstract/Introduction only, subsequent Methods request challenged; publisher 429."
    },
    {
      "pmid": "36829748",
      "decision": "hold; no outcome synthesis",
      "reason": "PMC challenge; search snippet not Methods."
    }
  ],
  "screenedSearchExclusions": [
    {
      "pmid": "30530451",
      "reason": "Search metadata indicates Polar strap criterion only; no ECG comparator established; not opened."
    },
    {
      "pmid": "40116771",
      "reason": "Search metadata identifies Polar H10 strap criterion; not opened."
    },
    {
      "pmid": "32552580",
      "reason": "Systematic review, not primary validation; not opened."
    },
    {
      "pmid": "42698643",
      "reason": "Systematic review, not primary validation; not opened."
    }
  ],
  "otherSearchHits": "All other returned links were not advanced in this bounded pass; not exhaustively screened and not evidence of exclusion on eligibility."
}