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Relationships between paramaters describing low-frequency electrical admittance locus plot of human palmar skin

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Abstract

Using a two-frequency three-electrode method, unipolar electrical admittance was measured in the palmar skin of 48 normal healthy humans. Characteristics of and relationships between the phase angle πα/2, the conductance extrapolated at zero frequency G0 and ion relation time τ obtained from the Cole-Cole equation were examined in a low-frequency region (up to 354 Hz). At base-line resting values, the three admittance parameters were interrelated according to the regression model; log τi = A + Bαi + D log Goi + εi with R2≥0·7434 (p≤0·0001), where Â, B and D determined from regression analysis showed inter- and intra-individual variation. Multi-factor analyses of variance showed that α was greater in women than men (0·8025 versus 0·7545, p<0·0023), and log G0 decreased significantly with age (covariate coefficient=−0·0058 log μS cm−2 per year, p<0·04). For evoked responses, α showed a very small change (maximum <5%), τ decreased while G0 increased. With increasing frequency, conductance responses increased in absolute amplitudes but decreased in relative changes (amplitude change divided by static level). Statistical analyses from clinical experimental materials (total 130 subjects) showed that the capacitive behaviour of admittance (due to α) presented significant variation between controls and patient groups. This may shed new light on the nature of the skin electrical admittance/impedance.

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Authors and Affiliations

  1. Research Institute of Neuropsychiatry, Dikemark Hospital, N-1385, Soiberg, Norway

    Z. G. Qiao & L. Mørkrid

  2. Department of Biomedical Engineering, Rikshospitalet, University of Oslo, Norway

    Z. G. Qiao

  3. Institute for Surgical Research, Rikshospitalet, University of Oslo, Norway

    Z. G. Qiao

Authors
  1. Z. G. Qiao
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  2. L. Mørkrid
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Qiao, Z.G., Mørkrid, L. Relationships between paramaters describing low-frequency electrical admittance locus plot of human palmar skin. Med. Biol. Eng. Comput. 33, 464–470 (1995). https://doi.org/10.1007/BF02510531

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  • DOI: https://doi.org/10.1007/BF02510531

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