Effects of single doses of UVA, UVB, and UVC on skin blood flow, water content, and barrier function measured by laser-Doppler flowmetry, optothermal infrared spectrometry, and evaporimetry.

Photo-dermatology Pub Date : 1988-08-01
T Frödin, L Molin, M Skogh
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Abstract

The effect of single doses of ultraviolet (UV) radiation was studied in 6 healthy men of skin Type III. Test areas on the forearm were irradiated with 150 J/cm2 UVA, 0.5 MED, 1 MED, and 3 MED UVB, and 1 MED UVC. Test areas and control areas were followed up for 1 month by clinical assessment, laser-Doppler flowmetry, evaporimetry, and optothermal infrared spectrometry (OTIS). UVA produced immediate erythema; the reaction appeared later with the other wavelength regions. All responses peaked after 12-24 h. The degree of erythema of UV-induced inflammation assessed visually correlated closely with the increase in skin blood flow registered with the laser-Doppler flowmeter. No increase in transepidermal water loss, indicating damage to the epidermal barrier, could be recorded by evaporimetry except on the area irradiated with 3 MED of UVB, where 4 subjects showed a moderate increase after 2 weeks. Changes in water content in the uppermost part of the epidermis, mainly in the stratum corneum, were detected by OTIS. A decrease took place that was most pronounced in the area irradiated with 3 MED UVB. This decrease in the OTIS signal is probably due to a combination of increased thickness and decreased water content of stratum corneum. We believe that these 3 noninvasive methods, especially in combination, are useful in the evaluation of different aspects of UV reactions.

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单剂量UVA、UVB和UVC对激光多普勒血流法、光热红外光谱法和蒸发法测量的皮肤血流量、含水量和屏障功能的影响。
对6例皮肤类型为III型的健康男性进行了单次紫外线照射的效果研究。前臂试验区以150 J/cm2 UVA、0.5 MED、1 MED、3 MED UVB和1 MED UVC照射。采用临床评估、激光多普勒血流仪、蒸发仪、光热红外光谱法(OTIS)对试验区和对照区随访1个月。UVA产生立即红斑;其他波长区域的反应出现较晚。所有的反应在12-24小时后达到顶峰。紫外线诱导炎症的红斑程度与激光多普勒流量计记录的皮肤血流量的增加密切相关。经皮失水(表明表皮屏障受到损伤)没有增加,但在接受3med UVB照射的区域,有4名受试者在2周后出现中度增加。OTIS检测了表皮最上层,主要是角质层含水量的变化。在受3meuvb照射的区域,这种下降最为明显。这种奥的斯信号的减弱可能是由于角质层厚度的增加和含水量的减少。我们认为,这3种非侵入性方法,特别是结合使用,在评估紫外线反应的不同方面是有用的。
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