The skin's electrical asymmetry

—The skin's electrical nonlinearities found experimentally are related to stratum corneum and modeled by the parallel resistance (Rp) as a linear current dependence in con-ductance (1/Rp). We show that such dependence could occur because the skin's current-voltage characteristic has a non-ohmic linear portion at large voltage, due to pores' conduction, that can be detected as a constant dynamic resistance (dU/dI).

Archives of Biological Sciences, 2012

Bioimpedance spectroscopy (BIS) is a popular method for characterizing the electrical properties of biological tissues. In this study, BIS measurement data of female and male human skin were analyzed and compared. The electrical characteristics of tissue were followed according to four-parameters of the Cole-Cole model: low frequency resistance R0; high frequency resistance R?; relaxation time t and parameter a. Individual electrical characteristics of human skin were determined for 30 women and 30 men. The distribution and one-way analysis of variance (one-way ANOVA) of the Cole-Cole parameters R0, R?, t, a within the human population indicated their different dependence on gender. Parameter a, which is higher in the female subjects (a =0.83?0.03) than in the male subjects (a=0.7?0.05), is strongly dependent on gender (p=0). Parameter R? also significantly depends on gender (p=0.002), while t and R0 seem to be slightly related to gender (p>0.05).

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THE ELECTRIC CAPACITY OF THE HUMAN SKIN. Nicolae-Marius BÂRLEA, Sânziana Iulia BÂRLEA. Tehnical University of Cluj-Napoca,Physics Department, Str. C. Daicoviciu 15, ROMANIA,. E-mail: [email protected]. ...

The Japanese Journal of Physiology, 1965

2003

A safe and inexpensive body diagnosis can be done by skin level electric measurements. An instrument that can do this reliably and effectively is the ElectroDermal Screening Device (EDSD) that is basically an ohmmeter. The low voltage emitted by this device causes a response at the acupuncture point, which reflects the condition of the associated system. Thus, it could be used in diagnosis and monitoring of a patient's health status. In the paper it is described our experimental device and the measurements we did on few healthy and sick persons, mainly on the distal points (points situated near the nails of the fingers or toes). We compared the acupuncture point measurements of healthy persons to those of persons who had conventionally diagnosed diseases. Apparently very simple this method requires adequate research for solving the technical problems and more important, the basic functioning mechanism.

2009 Annual International Conference of the Ieee Engineering in Medicine and Biology Society, Vols 1-20, 2009

We propose a new method for extracting the electrical properties of human skin based on the time constant analysis of its exponential response to impulse stimulation.

Medical & Biological Engineering & Computing, 1994

SKIN ELECTRICAL admittance/impedance measurement is an indicator of activity in the central and sympathetic nervous system. With Fere's DC method, skin was treated as purely resistive ' . Later, AC methods in the low-frequency region were developed. Plutchik and Hirsch (PLUTCHIK and HIRSCH, 1963) proposed that, with DC methods, polarisation effects are difficult to control, and the body cannot be assumed to act as a simple linear resistor. They measured the skin impedance and phase angle over the range of 1-1000 Hz and suggested that the skin phase angle may be more useful than impedance because individual differences in baseline level are then reduced to a minimum.

Journal of Controlled Release, 1999

High-voltage pulses have been shown to increase rates of transport across skin by several orders of magnitude on a time scale of minutes to seconds. Two main pulse protocols have been employed to promote transport: the intermittent application of short (|1 ms) high-voltage (|100 V across skin) pulses and a few applications of long (5100 ms) medium-voltage (.30 V across skin) pulses. In order to better evaluate the benefits of each protocol for transdermal drug delivery, we compared these two protocols in vitro in terms of changes in skin electrical properties and transport of sulforhodamine, a fluorescent polar molecule of 607 g / mol and a charge of 21. Whereas both protocols induced similar alterations and recovery processes of skin electrical resistance, long pulses of medium-voltage appeared to be more efficient in transporting molecules across skin. Skin resistance decreased by three (short pulses) and two (long pulses) orders of magnitude, followed by incomplete recovery in both cases. For the same total transported charge, long pulses induced faster and greater molecular transport across skin than short pulses. In addition, a greater fraction of the aqueous pathways created by the electric field was involved in molecular transport when using long pulse protocols. Transport was concentrated in localized transport regions (LTRs) for both protocols but LTRs created by long pulses were an order of magnitude larger than those formed by short pulses and the short pulses created an order of magnitude more LTRs. Overall, this study is consistent with the creation of fewer, but larger aqueous pathways by long, medium-voltage pulses in comparison to short, high-voltage pulses. (J.C. Weaver) ters . Electroporation of the stratum corneum 0168-3659 / 99 / $ -see front matter

Journal of Bioscience & Biomedical Engineering; ISSN 2693-2504, 2021

The article represents the ability of the human skin sensitive receptors and receptors of the proprioception to detect and code the very low intensive electric and magnetic fields. Was made the classification of the skin sensations to the electric field (EF) and magnetic field (MF)-34 kind sensations. Was made the electrophysiology pattern of every one sensation to the electric field (EF) and magnetic field (MF)-how the skin sensitive receptors and receptors of proprioception code the electric and magnetic fields to be translate from the sensitive nerve to the brain.

2007 International Kharkiv Symposium Physics and Engrg. of Millimeter and Sub-Millimeter Waves (MSMW), 2007

The phenomena of non thermal effects of extremely high frequency electromagnetic radiation on biological systems is explored. It is demonstrated that the effect is existent on human beings and is correlated to their physiological state via a measurement of the reflection coefficient of the palm. Possible sources of transient currents in biological systems ,needed to elicit a response are proposed