{
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  "capturedAt": "2026-11-10T06:30:52.561Z",
  "sha256": "2f0929110d6e9e0d0df1fd0d7d86b7ef555d8b4054836eaf40d8709c1d39ea0b",
  "work": {
    "type": "RDN",
    "kind": "note",
    "key": "lim-2026",
    "id": "TAP-RDN-0075",
    "locale": "en",
    "path": "/research/lim-2026/",
    "title": "TAP reading note: Perseverative cognition and vagally mediated heart rate variability in laboratory studies: A series of meta-analyses",
    "description": "28 laboratory studies contributed 60 effects to six analyses, separated by phase and comparison. Resting correlations yielded g=0.46 (95% CI 0.26–0.66), within-person reactivity 0.22 (0.11–0.33), and within-person recovery 0.19 (0.03–0.36). All three between-group pooled effects were nonsignificant. Positive g was coded as lower vagally mediated HRV (vmHRV), not an increase in HRV.",
    "rights": "© The Allostasis Project. All rights reserved. Reproduction or adaptation requires separate permission, subject to applicable legal exceptions.",
    "version": "1.0",
    "updatedAt": "2026-11-10",
    "editorial": {
      "contentType": "evidence-review",
      "reviewState": "draft",
      "reviewedAt": null,
      "reviewedVersion": null,
      "updatedAt": "2026-11-10",
      "version": "1.0",
      "byline": "team",
      "author": null,
      "reviewer": null,
      "workflow": {
        "ai": {
          "usage": "used",
          "system": "OpenAI Codex",
          "scope": "AI-assisted research and bilingual synthesis. Source access, manuscript versions and unresolved numerical discrepancies are specified in the reading notes. No human scientific review is recorded for this edition.",
          "version": "1.0",
          "tasks": [
            "Source retrieval, evidence extraction and comparison",
            "Bilingual synthesis and editorial preparation"
          ]
        }
      },
      "revisions": []
    },
    "original": {
      "id": "lim-2026",
      "title": "Perseverative cognition and vagally mediated heart rate variability in laboratory studies: A series of meta-analyses",
      "authors": "Chung Xiann Lim · Emily Mueller · William H. O’Brien",
      "journal": "International Journal of Psychophysiology",
      "year": "2026",
      "url": "https://doi.org/10.1016/j.ijpsycho.2026.113368",
      "doi": "10.1016/j.ijpsycho.2026.113368",
      "pmid": "41865891"
    },
    "references": [
      {
        "id": "lim-2026",
        "title": "Perseverative cognition and vagally mediated heart rate variability in laboratory studies: A series of meta-analyses",
        "authors": "Chung Xiann Lim · Emily Mueller · William H. O’Brien",
        "journal": "International Journal of Psychophysiology",
        "year": "2026",
        "url": "https://doi.org/10.1016/j.ijpsycho.2026.113368",
        "doi": "10.1016/j.ijpsycho.2026.113368",
        "pmid": "41865891"
      }
    ],
    "sections": [
      {
        "id": "finding",
        "title": "What the study found",
        "paragraphs": [
          "28 laboratory studies contributed 60 effects to six analyses, separated by phase and comparison. Resting correlations yielded g=0.46 (95% CI 0.26–0.66), within-person reactivity 0.22 (0.11–0.33), and within-person recovery 0.19 (0.03–0.36). All three between-group pooled effects were nonsignificant. Positive g was coded as lower vagally mediated HRV (vmHRV), not an increase in HRV."
        ]
      },
      {
        "id": "limits",
        "title": "Scope & limitations",
        "paragraphs": [
          "Healthy, non-clinical laboratory participants, disproportionately young and female. Sources overlap across analyses: 60 effects are not 60 independent studies and the analysis-specific samples must not be summed into a unique total.",
          "The review was not preregistered. Several analyses had substantial unexplained heterogeneity; resting correlations and within-person reactivity showed publication-bias signals. Removing one recovery outlier reduced g from 0.19 to 0.12 (95% CI 0.00–0.23; p=0.05). Within-person changes do not automatically exclude time or task confounding; nonsignificant between-group results do not prove absence of an effect. Laboratory vmHRV is not a measure of whole-person recovery, a diagnosis of perseverative cognition, an allostatic-load score or a long-term disease outcome."
        ]
      },
      {
        "id": "sample",
        "title": "Population & sample",
        "paragraphs": [
          "28 studies, 60 effects. Resting correlations k=14/n=2,296; resting between-group k=5/n=246; reactivity between-group k=9/n=610 and within-person k=18/n=818; recovery between-group k=5/n=264 and within-person k=9/n=349. Here k counts effects within each analysis; studies and samples can overlap."
        ]
      },
      {
        "id": "exposure",
        "title": "Exposure or intervention",
        "paragraphs": [
          "Self-reported perseverative cognition or laboratory worry/rumination induction, distinguishing rest, induction reactivity and the period after participants were told induction had ended. Between-group analyses combine high/low cognition groups and induction/control groups; resting correlations are separate."
        ]
      },
      {
        "id": "outcomes",
        "title": "Outcomes",
        "paragraphs": [
          "Standardized vmHRV differences. Within-person recovery compares the post-induction period with the original resting baseline; it is not directly a recovery-speed estimate. The three principal estimates and CIs appear in the findings; between-group estimates all crossed zero."
        ]
      },
      {
        "id": "duration",
        "title": "Time frame",
        "paragraphs": [
          "Phase-specific vmHRV recordings lasted 2–15 minutes, with a median of five minutes. These observations do not establish effects over months or years."
        ]
      },
      {
        "id": "funding",
        "title": "Research funding",
        "paragraphs": [
          "No separate funding statement was located in the accepted manuscript consulted. This does not establish absence of funding."
        ]
      },
      {
        "id": "conflicts",
        "title": "Research conflicts of interest",
        "paragraphs": [
          "On the accepted manuscript title page, the authors declare no conflict of interest."
        ]
      },
      {
        "id": "basis",
        "title": "Reading scope",
        "paragraphs": [
          "Read the 55-page v2 accepted manuscript posted by the authors on PsyArXiv on 22 March 2026: methods, six main analyses, sensitivity results, limitations and figures/tables; compared with the published 2026 abstract and bibliographic record. This accepted manuscript is distinguished from earlier preprints. Separately cited tables A1–A6 and supplements S1–S4 were not obtained; pooled effects were not independently recomputed."
        ],
        "links": [
          {
            "label": "PsyArXiv v2 accepted manuscript and version record",
            "url": "https://osf.io/preprints/psyarxiv/w9dbn_v2/"
          },
          {
            "label": "Published article",
            "url": "https://doi.org/10.1016/j.ijpsycho.2026.113368"
          },
          {
            "label": "PubMed record",
            "url": "https://pubmed.ncbi.nlm.nih.gov/41865891/"
          }
        ]
      }
    ]
  }
}