L'Oreal Research and Innovation, Saint-Ouen, France.
Skin Res Technol. 2013 Nov;19(4):384-93. doi: 10.1111/srt.12057. Epub 2013 May 5.
Ageing of the skin, being chronological or sun induced is highly documented. Scalp, as a specific skin site, has, however, received little attention. This work attempted to describe functional and structural alterations that occur in scalp skin with ageing.
Two different age groups (N = 15 each; 30 ± 3 and 62 ± 2 y.o. respectively) of Caucasian women participated in the study. Some functional parameters (TEWL, Sebum level, Hydration, T°) were recorded on the vertex part of the scalp, after having cut the hair flat on the scalp surface. Imaging of some structural criteria was carried out using high-frequency ultrasound technique and optical coherence tomography on the same scalp site and on the mid-forehead, as a close control skin site.
As compared with the younger group, the scalp of older women significantly showed a decreased TEWL and a slightly lower T°. The thickness of total skin (epidermis + dermis) increased with age on both scalp and on forehead. The thickness of scalp epidermis decreased with age while not significantly altered on forehead. Pseudoattenuation of ultrasound images increased in the older age group. Other criteria, such as sebum level, stratum corneum hydration, stratum corneum thickness, were not found altered with age.
With ageing, some few functional and structural changes are observed in the scalp of Caucasian women. Similarities or differences with those previously reported in other skin sites are discussed.
皮肤的老化，无论是自然的还是由阳光引起的，都有大量的文献记载。然而，头皮作为一个特定的皮肤部位，却很少受到关注。本研究试图描述头皮皮肤随年龄增长而发生的功能和结构变化。
两组不同年龄的白种女性（每组 15 人；分别为 30 ± 3 岁和 62 ± 2 岁）参与了这项研究。一些功能参数（TEWL、皮脂水平、水分、T°）在头皮的顶点部位进行记录，在将头发剪平在头皮表面后。使用高频超声技术和光学相干断层扫描对同一头皮部位和中额部（作为密切控制的皮肤部位）进行一些结构标准的成像。
与年轻组相比，老年女性的头皮 TEWL 明显降低，T°略低。头皮和额部的总皮肤（表皮+真皮）厚度随年龄增长而增加。头皮表皮厚度随年龄增长而变薄，但额部无明显变化。超声图像的伪衰减在老年组中增加。皮脂水平、角质层水分、角质层厚度等其他标准未随年龄变化而改变。
在白种女性的头皮中，随着年龄的增长，观察到一些功能和结构的微小变化。讨论了与其他皮肤部位先前报道的相似或不同之处。
