{
  "annotation_id": "4a669e94-adbd-47d6-9264-3c5c34745ad8",
  "date_created": "2026-03-02T18:00:43.219000Z",
  "date_modified": "2026-03-02T18:00:43.219000Z",
  "file_hash": "8557e657237839f685d9c63b225bf1f3a8e09ee3ddd1f61ba6bec06de6059526",
  "private": false,
  "record": {
    "abstract": "The statistical properties (fluctuations) of heartbeat intervals (RR\nintervals) in ECG are studied and compared with the predictions of Random\nMatrix Theory (RMT). It is found that heartbeat intervals only locally exhibit\nthe fluctuation patterns (universality) predicted by the RMT. This finding\nshows that heartbeat dynamics is of the mixed type where regular and irregular\n(chaotic) regimes coexist and the Berry-Robnik theory can be applied. It is\nalso observed that the distribution of heartbeat intervals is well described by\nthe one-parameter Brody distribution. The parameter $\\beta $ of the Brody\ndistribution is seen to be connected with the dynamical state of the heart.",
    "arxiv_id": "physics/0301011",
    "authors": [
      "M. Martinis",
      "V. Mikuta-Martinis",
      "A. Knezevic",
      "J. Crnugelj"
    ],
    "categories": [
      "physics.med-ph",
      "q-bio"
    ],
    "doi": "10.1143/PTPS.150.381",
    "title": "Spectral Statistics of RR Intervals in ECG",
    "url": "https://arxiv.org/abs/physics/0301011"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "0151b3aa-2edf-49e7-b27a-9bfcc2756fbf",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}