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Research > Analysis of Skin Conductivity Test
Study on the Change in Skin Resistance of a Person Exposed
to Stress with and without the Use of the QLink
Institute of Environmental Health, University of Vienna
Department of Occupational and Social Hygiene (Head: Prof
Means of groups A plus B (all exposures) for all 40 test points
test conditions. The use of the QLink pendant while exposed to stress
reduces the number of values which indicate stress and increases
number of values within the optimal range.
The study, the results of which are presented herein, was
carried out by Dr. Reye
at Denver, Colorado. The purpose of the study was to determine
to what extent the use of the QLink pendant has an impact
on changes in skin resistance, which can be observed during
stress. The experiment was carried out as a pilot study
in order to obtain first evidence on the effectiveness of
the QLink pendant.
2. Material and Methods
A total of 24 adults (10 males and 14 females) were tested, two of which
had to be excluded from the evaluation because of incomplete data. Three
test groups were formed:
Group A: 13 persons, 3 test conditions: baseline measurement,
exposure to an electric facial muscle stimulator as stress condition
with and without the use of the QLink pendant.
Group B: 5 persons, 3 test conditions: baseline measurement,
exposure to an electric hairdryer as stress condition with and without
the use of the QLink pendant.
Group C: 4 persons, 2 test conditions: baseline measurement and
the QLink pendant without stress condition.
Both devices, the facial muscles stimulator and the hair-dryer, were
switched on and placed in the lap of the test person. The QLink pendant
had not been worn for more than two minutes before the person was exposed
to the stress. The skin resistance was measured by means of a Computronix
Acupro II, model Z-41. Each series of measurements included 40 defined
points on the skin (20 points on the right side of the body and 20 points
on the left side of the body). These defined points are acupuncture
points and correspond to the testing points along the acupuncture meridians.
The device measures skin resistance by introduction of a voltage of
1.25 volt and measuring the current. The device scales the skin resistance
in terms of conductivity. The scale goes from 0 to 100. Values below
50 are considered a sign of "congestion", whereas values above 55 are
considered a sign of an "inflamed" condition.. Values between 50 to
55 are considered balanced.
For statistical evaluation of the differences between the various
test conditions the measured results achieved for the 40 points were
categorised as follows: values below 40, values ranging from 40 to below
50, values ranging from 50 to below 55, values ranging from 55 to below
65, and values of 65 and above. For each person and test condition the
number of test points (of 40) within these 5 categories was determined.
Due to the fixed number of test points, four of these frequencies are
sufficient for characterisation. With regard to groups A and A plus
B these results were analysed by means of a multivariate analysis of
variance followed by Tukey's HSD tests with respect to the differences
between the individual test conditions. Because of the small number
of cases in groups B and C the results of these two groups were analysed
separately for the four categories by means of univariate analyses of
Most test points showed a change in the galvanic skin response (conductivity
of the skin) as compared to the baseline measurement when exposed
to the electric device. This was true for both groups exposed (A:
with facial muscle stimulator; B: with hair-dryer). If the
QLink pendant is worn at the same time, this leads to a reduction
of conductivity in the direction to the balanced range.
The present study was carried out in order to provide a first indication
of the effects of the QLink pendant on skin conductivity when exposed
to stress caused by various electric devices. The data of 22 persons
were analysed. 18 of them were either exposed to a facial muscle stimulator
or to a hair-dryer as "source of interference". Four persons were tested
only with regard to the effects of the QLink pendant without being exposed
to any stress. A baseline measurement at 40 acupuncture points was carried
out for each person. In case of the 18 persons exposed to stress caused
by an electric device a series of measurements was carried out at the
same 40 points with and without the use of the QLink pendant. As this
was a pilot study, neither the sequence of the tests was varied nor
was the study conducted under single or double blind conditions. This
will have to be done in future studies.
The use of the QLink pendant without exposure to stress led to an increase
in the number of measurements in the balanced range (scale values 50
to 55). This result, however, was statistically not significant because
of the small number of cases (only four persons). In case of exposure
to stress caused by an electric device the skin conductivity was increased
at almost all test points. This increase results in a significant increase
in the number of measurements above the optimal range. The use
of the QLink pendant while exposed to stress reduces the number of values
which indicate excitement of the respective meridians and increases
the number of values within the optimal range.
Download Prof. Michael Kundi's complete study (PDF):
Study on the Change in Skin
(To download, right-click on the link, choose 'Save Target (or Link)
As,' and save into your computer.)
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