TESTING 27


Figure 4: a and b: TEWL measurements on up to 24 cultured skin wells, all readings shown simultaneously. a


b


measure in a temperate room at 20-22°C and a relative humidity of 40-60%. To acclimatize to these conditions, the subject should undergo an acclimatization period at the very same conditions, at least 20-30 minutes prior to the start of the measurements. During this acclimatization time, any physical exercise, mental stress and excitement have to be avoided. Exceptions are of course if you want to study effects of physical or mental stress on the skin.


ClCleansining without irirr Silsurf® Di-T108


witith In temperate climate zones, there is a


pronounced difference between the seasons that also influences skin condition. Dry air from heating in winter or air conditioning in summer will stress and dry out the skin. Frequent alternation between cold and warm environments will not only be challenging to general health but also to the skin. For reliable results, you should compare data taken during the same season. In hot summers, the temperature may even be too high to carry out tests due


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to unavoidable sweating or the impossibility to keep the temperature within the measurement room at the designated standard conditions. Not only the season, but even the time of day may influence the outcome of measurements. Skin conditions, the same as other physiological reactions, follow certain circadian rhythms that have been subject to numerous studies.4, 5, 6, 7


Therefore,


for comparable results, you should always measure your subjects at approximately the


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March 2020


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