Influence of probe application pressure on in vitro and in vivo capacitance (Corneometer CM 825(®) ) and conductance (Skicon 200 EX(®) ) measurements.
Summary of "Influence of probe application pressure on in vitro and in vivo capacitance (Corneometer CM 825(®) ) and conductance (Skicon 200 EX(®) ) measurements."
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. Methods: 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. Results: 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%). Conclusion: This study confirms the influence of probe pressure application on the skin surface when carrying out capacitance and conductance hydration measurements.
Affiliation
Department of Human Biometry and Biomechanics, Faculty of Physical Education and Physiotherapy, Vrije Universiteit Brussel, Brussels, Belgium International Academy of Physiotherapy, Thim van der Laan, Landquart, Switzerland.
Journal Details
This article was published in the following journal.
Name: Skin research and technology : official journal of International Society for Bioengineering and the Skin (ISBS) [and] Internatio
ISSN: 1600-0846
Pages:
Links
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/21338409
- DOI: http://dx.doi.org/10.1111/j.1600-0846.2011.00516.x
Medical and Biotech [MESH] Definitions
Vascular Capacitance
The measure of a BLOOD VESSEL's ability to increase the volume of BLOOD it holds without a large increase in BLOOD PRESSURE. The vascular capacitance is equal to the change in volume divided by the change in pressure.
Embryo Transfer
The transfer of mammalian embryos from an in vivo or in vitro environment to a suitable host to improve pregnancy or gestational outcome in human or animal. In human fertility treatment programs, preimplantation embryos ranging from the 4-cell stage to the blastocyst stage are transferred to the uterine cavity between 3-5 days after FERTILIZATION IN VITRO.
Intermittent Positive-pressure Breathing
Application of positive pressure to the inspiratory phase of spontaneous respiration.
Intermittent Positive-pressure Ventilation
Application of positive pressure to the inspiratory phase when the patient has an artificial airway in place and is connected to a ventilator.
Mutagenesis, Insertional
Mutagenesis where the mutation is caused by the introduction of foreign DNA sequences into a gene or extragenic sequence. This may occur spontaneously in vivo or be experimentally induced in vivo or in vitro. Proviral DNA insertions into or adjacent to a cellular proto-oncogene can interrupt GENETIC TRANSLATION of the coding sequences or interfere with recognition of regulatory elements and cause unregulated expression of the proto-oncogene resulting in tumor formation.
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