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Spatial variability of vasodilatation in human forearm skin
Author(s) -
TUR ETHEL,
MAIBACH H.I.,
GUY R.H.
Publication year - 1985
Publication title -
british journal of dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.304
H-Index - 179
eISSN - 1365-2133
pISSN - 0007-0963
DOI - 10.1111/j.1365-2133.1985.tb02065.x
Subject(s) - forearm , photoplethysmogram , vasodilation , medicine , plethysmograph , anatomy , area under the curve , cardiology , filter (signal processing) , computer science , computer vision
SUMMARY Vasodilatation elicited by topical application of methyl nicotinate was measured by photoplethysmography at various positions on human ventral forearm skin. The time‐to‐peak response, the magnitude of the peak response, the area under the response‐time curve and the time for the response to decay to 75% of the maximum value, were recorded at six positions on the left and right forearms of eight subjects. There was no significant difference between response on the right and left forearm sites and no difference in response between the lateral and medial sites on the forearms. In a second experiment, the vasodilatation was measured at proximal and distal positions on the forearm. The magnitude of the peak response at the proximal position was significantly higher than that found distally (P<0.01) as was the area under the response‐time curve (P<0.05). These results suggest a possible cause for the variation observed in vasoconstrictor assays of corticosteroids.