Skin Hydration (Transepidermal Water Loss) — Measuring Methods and Dependence on Washing Procedure

Zienicke, H.

doi:10.1007/978-3-642-50146-3_16

Cited by 2 publications

(1 citation statement)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…6, as well as the tests in which unperfumed Lux soap was used (Figs 4 and 5) confirms that use of soap does not adversely influence eccrine sweat pH. It is known [32] that prolonged use of soap can lead to an increase in skin surface pH as a consequence of incorporation of the fatty soaps into skin lipids but soap does not appear to have any effect on eccrine sweat. This is probably a result of the high flow rate of eccrine sweat rapidly removing any soap that has diffused into the glands.…”

Section: Discussionsupporting

confidence: 61%

Erroneous gender differences in axillary skin surface/sweat pH

Burry

Coulson

et al. 2001

Intern J of Cosmetic Sci

View full text Add to dashboard Cite

Assessing accurately the pH of axillary eccrine sweat is of vital importance in the antiperspirant industry. Eccrine sweat pH is a critical parameter in determining the effectiveness of antiperspirants; antiperspirant salts dissolve in sweat and diffuse into the sweat glands, where the resultant acidic solution hydrolyses in more alkaline sweat forming an amorphous metal hydroxide gel, thereby restricting the flow of eccrine sweat. Comparison of the skin surface and sweat pH of males and females reported in the literature shows that, although consistent male/female differences have been observed on the forearm, determination of significant gender-based pH differences across other sites are less conclusive. Studies on the back and infra-mammary regions exhibited significant gender differences in skin surface pH, whereas those on the forehead, cheek, neck and inguinal area showed no such difference. With regard to the axilla specifically, four studies have been reported, three showing no significant difference in axillary skin surface pH and one indicating that females have an eccrine sweat pH of 7 and males have a sweat pH of 5.6. This paper describes a series of carefully controlled studies aimed at assessing potential gender differences in eccrine sweat and skin surface pH following exposure to a variety of temperature, humidity and time conditions. The results highlight the importance of controlling precisely the time of investigation, site of measurement and, most importantly, the necessity to pre-equilibrate samples in 40 mmHg carbon dioxide (equivalent to arterial CO(2) tension (pCO2)) before determining sweat pH. When these parameters are controlled no gender differences in axillary sweat or skin surface pH are observed. Large differences in eccrine sweat and skin surface pH are found, however, between the vault (hairy region) and fossa (non-hairy region) of the axilla.

show abstract

Section: Discussionsupporting

confidence: 61%