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Stress Response Pattern of Heart Rate Variability in Patients with Functional Somatic Syndromes

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Abstract

Functional somatic syndromes (FSSs) represent a clinically important group of disorders that are often stress-related. Their autonomic pathophysiology, including reduced heart rate variability (HRV), has been reported. However, the response pattern to mental stress and recovery in FSSs remains unclear. Thus, we aimed to clarify the pattern of autonomic stress response and recovery to mental arithmetic stress in patients with FSS compared to that in healthy controls. This cross-sectional study included 79 patients with FSS who visited the Department of Psychosomatic Medicine at a university hospital in Japan and 39 healthy controls. Following a mood questionnaire and obtaining epidemiologic information, HRV was measured during three periods (5 min each): relaxation baseline resting, stress (mental arithmetic task), and post-stress recovery period. The HRV analysis included inter-beat interval, low frequency power, and high frequency power. Compared to healthy controls, patients with FSS exhibited significantly higher scores on the mood questionnaire, prolonged duration of illness, and decreased functionality in daily activities. While the healthy control group showed a pronounced stress response pattern with a significant decrease in vagal HRV and recovery, the FSS group showed a “flat” vagal stress response pattern, and the HRV in the FSS group was lower at relaxation baseline, remained low during the stress, and did not change post stress. Patients with severe FSS exhibit an altered stress response pattern. Our results could provide significant clues for the diagnosis and treatment of such patients, as well as useful insights into the relationship between stress and illness.

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Data Availability

The datasets during the current study available from the corresponding author on reasonable request.

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Funding

This work was supported by JSPS KAKENHI Grant Number JP20k03462.

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Correspondence to Kenji Kanbara.

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The authors declare that they have no conflicts of interest.

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All research participants provided informed consent for inclusion in the study, and the study was approved by the ethical committee of Kansai Medical University.

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Saka-Kochi, Y., Kanbara, K., Yoshida, K. et al. Stress Response Pattern of Heart Rate Variability in Patients with Functional Somatic Syndromes. Appl Psychophysiol Biofeedback 49, 145–155 (2024). https://doi.org/10.1007/s10484-023-09608-z

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  • DOI: https://doi.org/10.1007/s10484-023-09608-z

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