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Comparison between CV4 and EV4 - Osteopathic Research

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31<br />

4.1.3 Sensors<br />

4.1.3.1 Multi sensor<br />

This multisensor simultaneously captures three physiological measurements:<br />

electrical skin conductivity<br />

pulse rate<br />

skin temperature<br />

fig. 10<br />

multi sensor<br />

4.1.3.1.1 EDG = electro dermography<br />

This measures the electric conductivity of the skin, which is a relative<br />

measurement tool for sweat gl<strong>and</strong> activity <strong>and</strong> thus for the activity of the<br />

sympathetic as well. Every mental stimulation has a direct effect on the skin<br />

resistance.<br />

Technical facts:<br />

• Unit of electrical skin conductance: Siemens (S)<br />

• Electrical conductivity is the reciprocal value of the skin’s electrical<br />

resistance<br />

• Unit of the skin’s electrical resistance: Ohm ( Ω)<br />

• The report is done digitally in micro-Siemens (µS)<br />

• The surface area of both sensors is 50.3 mm 2<br />

• The skin conductance value is marked four times per second<br />

Margit Grill / 2006

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