Department of Human Biometry and Biomechanics, Faculty of Physical Education and Physiotherapy, Vrije Universiteit Brussel, Brussels, Belgium.
Skin Res Technol. 2011 Nov;17(4):445-50. doi: 10.1111/j.1600-0846.2011.00516.x. Epub 2011 Feb 22.
BACKGROUND/PURPOSE: The measuring probe of the electrical hydration instruments is equipped with a spring system to ensure a constant pressure of probe application on the skin surface. However, it is possible to trigger the measurement at, respectively, a low and a high force of probe application. It is the purpose of this paper to compare the in vitro and in vivo hydration values of the capacitance and conductance method at, respectively, low and high values of application pressure on the considered surface.
In vitro capacitance and conductance hydration measurements were carried out at a low and a high pressure on a calibration filter pad impregnated with different alcohols and in vivo on different skin sites covering a wide range of hydration values.
The in vitro results were pressure dependent and higher hydration values were noticed when the probes were applied with a high pressure compared with a low pressure. In vivo, the pressure effect was a function of the skin type and it was more pronounced for dry skin (40%), lower for normal skin (20%) and the lowest for hydrated skin (5-8%).
This study confirms the influence of probe pressure application on the skin surface when carrying out capacitance and conductance hydration measurements.
背景/目的：电水分测定仪的测量探头配备有弹簧系统，以确保探头在皮肤表面的应用保持恒定的压力。然而，在探头应用的低力和高力下，均有可能触发测量。本文的目的是比较在考虑的表面上，探头应用的低和高压力下，电容和电导法的体外和体内水合值。
在低和高压力下，对浸渍有不同醇的校准滤垫进行体外电容和电导水合测量，以及在涵盖广泛水合值的不同皮肤部位进行体内测量。
体外结果与压力有关，与低压力相比，高压力下探头的应用会导致更高的水合值。体内，压力的影响是皮肤类型的函数，对于干燥皮肤（40%）更为明显，对于正常皮肤（20%）较低，对于水合皮肤（5-8%）最低。
本研究证实了在进行电容和电导水合测量时，探头在皮肤表面的压力应用对其的影响。
