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Related Experiment Video

Updated: Sep 21, 2025

Dynamic Digital Biomarkers of Motor and Cognitive Function in Parkinson's Disease
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Heart-brain synchronization breakdown in Parkinson's disease.

Martin Iniguez1,2,3, Antonio Jimenez-Marin3,4, Asier Erramuzpe5

  • 1School of Engineering, University Carlos III of Madrid, Madrid, Spain.

NPJ Parkinson'S Disease
|May 31, 2022
PubMed
Summary
This summary is machine-generated.

Heart rate variability (HRV) and brain activity synchronization is reduced in Parkinson's disease (PD) patients. This heart-brain desynchronization worsens with increasing autonomic dysfunction severity in PD.

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Area of Science:

  • Neuroscience
  • Cardiology
  • Autonomic Nervous System Research

Background:

  • Heart rate variability (HRV) abnormalities are potential early Parkinson's disease (PD) biomarkers.
  • The relationship between HRV and central autonomic network (CAN) activity in PD is not fully understood.

Purpose of the Study:

  • To analyze the synchronization between HRV and brain activity in PD patients.
  • To assess the association between heart-brain synchronization and clinical dysautonomia severity in PD.

Main Methods:

  • Resting-state functional MRI (BOLD signals) and finger plethysmography (HRV) were used in 31 PD patients and 21 controls.
  • Autonomic function was assessed using SCOPA-AUT, blood pressure, and heart rate during autonomic challenges (deep breathing, Valsalva, head-up tilt).
  • HRV-BOLD synchronization was evaluated using cross-correlations and Fisher's statistics.

Main Results:

  • PD patients exhibited significantly lower HRV-BOLD synchronization in CAN and autonomic modulation networks compared to controls.
  • Heart-brain synchronization index (HBSI) showed an inverse relationship with dysautonomia severity, being lowest in severe PD.
  • HBSI in PD was associated with sympathetic (Valsalva) and cardiovagal (deep breathing) function, and autonomic symptom scores (SCOPA-AUT).

Conclusions:

  • Findings support the existence of heart-brain desynchronization in Parkinson's disease.
  • This desynchronization impacts clinically relevant autonomic outcomes and disease severity.