Response rates of tcPco
2 measurement, the rate of Pco
2 increase from air level to steady state, were recorded with tcPco
2 monitor in various body surface and on the stripped skin. The half-time (t
1/2) on the oral mucosa was shortest, followed in order on the arm, back, sole. Tape stripping shortened t
1/2. As a result of
in vitro examination using isolated stratum corneum sheets from the upper arm, it was proved that the response rate of tcPco
2 measurement is mainly limited by diffusion through the stratum corneum, the CO
2 diffusion constant of which estimated to be 0.1×10
-7cm
2/sec
in vitro. These results suggest that the t
1/2 lengthens with thickening of the stratum corneum, therefore, this method may be utilized to evaluate the thickness of the stratum corneum.
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