Effects of far-infrared radiation on heart rate variability and central manifestations in healthy subjects: a resting-fMRI study

Yii Jeng Lin, Yen Ying Kung, Wen Jui Kuo, David M. Niddam, Chou Ming Cheng, Chih Che Chou, Tzu Chen Yeh, Jen Chuen Hsieh, Jen Hwey Chiu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The aim of this study was to investigate the autonomic responses and central manifestations by peripheral FIR stimulation. Ten subjects (mean ± SD age 26.2 ± 3.52 years) received FIR stimulation at left median nerve territory for 40 min. Electrocardiograph was continuously recorded and heart rate variability (HRV) were analyzed. By using a 3 T-MRI scanner, three sessions of resting-state functional magnetic resonance images (fMRI) were acquired, namely, before (baseline-FIR), immediately after (IA-FIR) and 15 min after FIR was turned off (Post-FIR). The fractional amplitude of low-frequency (0.01-0.08 Hz) fluctuation (fALFF) of each session to evaluate the intensity of resting-brain activity in each session was analyzed. Our results showed that FIR stimulation induced significant HRV responses such as an increasing trend of nLF and LF/HF ratio, while FIR increased fALFF in right superior front gyrus, middle frontal gyrus and decreased the resting brain activity at fusiform gyrus, extrastriae cortex, inferior temporal gyrus and middle temporal gyrus, especially 15 min after FIR was turned off. We conclude that the central manifestation and the autonomic responses are prominent during and after FIR stimulation, which provide important mechanistic explanation on human disorder treated by such energy medicine.

Original languageEnglish
Pages (from-to)295-301
Number of pages7
JournalLasers in Medical Science
Volume30
Issue number1
DOIs
StatePublished - Jan 2014

Keywords

  • Far-infrared radiation
  • fMRI
  • Heart rate variability
  • Resting state network

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