Introduction:

The team of Ma Li, Qin Ou, Wang Xuemin, and Tan Yimei (from the Skin and Cosmetics Research Laboratory of Shanghai Dermatology Hospital) published an article in the Journal of Clinical Dermatology（2024 year47 Volume No9 Period,J Clin Dermatol, September 2018, Vol.47, No.9）Publish a paper analyzing the biophysical characteristics of female scalp in Shanghai through non-invasive instrument systems, which is beneficial for targeted scalp care and disease prevention.

summaryAbstract：

Objective: To explore the biophysical characteristics of scalp in women of different ages and locations in Shanghai.

Method: Divide volunteers into youth group, middle-aged group, and elderly group, and use

Non traumatic testing instruments are used to detect physiological parameters of the top and occipital regions of the scalp, including transepidermal water loss, stratum corneum water contentpHValue, oil secretion, transdermal oxygen and carbon dioxide partial pressure.

Result: Transepidermal water loss in the occipital region of the scalppHThe values and oil secretion are lower than the top, while the moisture content and transcutaneous oxygen pressure of the stratum corneum are higher than the top, and the differences are statistically significant.

The moisture content of the stratum corneum at the top of the scalp increases with age, while oil secretion decreases with age.

Conclusion: The scalp of women in Shanghai has characteristic biological and physical parameters at different ages and locations. Daily care of the scalp should be carried out according to specific circumstances to prevent the occurrence of scalp related diseases.

[keywords]Scalp; Biological and physical characteristics; age

Transdermal water lossdetection

adoptBiox AquaFluxTransdermal moisture loss measuring instrumentEvaluate scalp barrier function with a specialized scalp testing probe. Prior to testing, the subjects were at a certain temperature（20±2）℃, humidity（50±10）%Sitting quietly in the room30 minEnsure stable scalp condition; Select the top of the scalp and occipital area for testing2 cm×2 cmArea, the probe should avoid contact with hair residue to ensure data accuracy.

（Biox AquaFluxTransdermal moisture loss measuring instrument）

The moisture content of the stratum corneum and pHValue detection:

useSkin moistureimagingceremonydetectionskinThe moisture content of the stratum corneum,pHTest the scalp surface with a testerpHValue; Both types of instruments detect at different locations in the same area after hair cutting to expose the scalp, reducing probe contact interference.

（EpsilonSkin Moisture Imaging Device

Scalp health is an important component of skin health, and scalp related diseases such as dandruff and sensitive scalp have a significant impact on people's quality of life.

Studying the biological and physical parameters of normal scalp is of great significance for understanding the pathogenesis of scalp related diseases.

This study used non-invasive detection instruments to assess barrier function, oil secretion A comprehensive evaluation was conducted on aspects such as transcutaneous oxygen and partial pressure of carbon dioxide in the Shanghai area 62 The scalp characteristics of healthy women of different ages and parts.

Numerous studies have found that various biophysical parameters of the skin change with age. The skin manifestations of the elderly are TEWLDecrease, increase in moisture content, and decrease in oil and fat levels. The characteristic of the scalp that distinguishes it from other parts of the skin is that it is covered with a large amount of hair. Under normal circumstances, the oil secreted by sebaceous glands can help maintain the barrier function of the scalp.

However, hair cannot withstand the exposure of sunlight, Therefore, as age increases, The scalp can also undergo a series of changes in biophysical parameters due to natural aging and photoaging.

In a study of Caucasian scalp, it was found that the skin on the top of the scalp TEWLThe value and oil level both decrease with age, while the thickness of the scalp significantly increases. This study evaluated the changes in physiological and physical parameters of the scalp top and occipital regions in Shanghai women with age.

The results show that the top of the scalp TEWLThe value decreases with age, and the moisture content of the occipital area andpHThe value increases with age, while the oil in the top and occipital areas decreases with age, which is consistent with the results of studies on Caucasian populations.

In addition, this study also measured the transcutaneous oxygen and carbon dioxide partial pressure index of the scalp, which can reflect the microcirculation functional status of local tissues and the metabolic function of cells. The results showed that the transcutaneous carbon dioxide partial pressure increased to a certain extent with age, As age increases, the metabolic function of the scalp may decrease.