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Open AccessArticle

New Application of an Instantaneous Frequency Parameter for Assessing Far Infrared Fabric Effects in Aged Subjects

1
School of Electrical and Information Engineering, North Minzu University, No. 204 North Wenchang Street, Yinchuan 750021, Ningxia, China
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Basic Experimental Teaching and Engineering Training Center, North Minzu University, No. 204 North Wenchang Street, Yinchuan 750021, Ningxia, China
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School of Science, Ningxia Medical University, No. 1160, Shengli Street, Yinchuan 750004, Ningxia, China
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Taichung Tzuchi Hospital, The Buddhist Tzuchi Medical Foundation, Taichung 42743, Taiwan
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School of Post-baccalaureate Chinese Medicine, Tzu Chi University, Hualien 97002, Taiwan
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Department of Electronics Engineering, Dong Hwa University, No. 1, Sec. 2, Ta Hsueh Rd., Shoufeng, Hualien 97401, Taiwan
*
Author to whom correspondence should be addressed.
Signifies equal contribution compared with the corresponding author.
Electronics 2020, 9(1), 138; https://doi.org/10.3390/electronics9010138
Received: 4 December 2019 / Revised: 6 January 2020 / Accepted: 9 January 2020 / Published: 10 January 2020
(This article belongs to the Section Bioelectronics)
A microcirculation microscope has recently been introduced to reveal finger blood flow changes by visualization, before and after using far-infrared fabric. Digital volume pulses (DVPs) from the dominant index fingertip of healthy young subjects (Group 1, n = 66) and healthy upper middle-aged subjects (Group 2, n = 33) were acquired through a photoplethysmographic electrical device (PED). By using the one intrinsic mode function (i.e., IMF5), an instantaneous frequency difference (ΔfEmax) was revealed through the second part of the Hilbert–Huang transformation. Parameters from DVPs in the time domain, i.e., the stiffness index, crest time, crest time ratio, and finger perfusion index, were also obtained for comparison. The results showed significant differences in FPI and ΔfEmax between the two groups (p = 0.002 and p = 0.043, respectively). A significant ΔfEmax was also noted for the two groups under the effects of far-infrared radiation (FIR) (Group 1: p = 0.046; Group 2: p = 0.002). In conclusion, this study aimed to validate a self-developed and economical device, with a good extensibility, which can be operated in a domestic setting, and to demonstrate that the PED performed quantitative indexes on finger blood flow comparable to those investigated through a microcirculation microscope. View Full-Text
Keywords: far-infrared fabric; finger blood flow; digital volume pulse (DVP); Hilbert–Huang transformation; far-infrared radiation (FIR) far-infrared fabric; finger blood flow; digital volume pulse (DVP); Hilbert–Huang transformation; far-infrared radiation (FIR)
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MDPI and ACS Style

Wei, H.-C.; Li, Y.-Q.; Wu, G.-S.; Xiao, M.-X.; Tang, X.-J.; Chen, J.-J.; Wu, H.-T. New Application of an Instantaneous Frequency Parameter for Assessing Far Infrared Fabric Effects in Aged Subjects. Electronics 2020, 9, 138.

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