Selected mechanical paremeters of women‘s hair in the Caucasian population

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F46747885%3A24510%2F17%3A00010320" target="_blank" >RIV/46747885:24510/17:00010320 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11510/17:10365399

Result on the web

<a href="https://pubmed.ncbi.nlm.nih.gov/28759188/" target="_blank" >https://pubmed.ncbi.nlm.nih.gov/28759188/</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Selected mechanical paremeters of women‘s hair in the Caucasian population

Original language description

OBJECTIVE: More parameters have been used for more detailed description ofmechanical properties of human hair as a fibre than in analogous studies. All mea-sured samples were taken from five different locations on the heads of 60 womenof varied age. METHODS: For each hair, the diameter was determined optically andthen the test in the Deform Type 2 testing machine was carried out. Deformationcurves were obtained by testing 10 mm long samples up to the rupture point atconstant temperature, humidity and constant crossbar speed of 2 mm/min. Thecurves were processed with software for the calculation of mechanical parametersof the hairs. This specialized software has been designed by us for that purpose.Resulting values were arranged into tables and figures. RESULTS: As far as haircross-section is concerned, it has been found that for the European populationit appears to be rather higher – 86 μm – than indicated in formerly publishedtexts. The 56 μm mentioned in the work of other authors has been observed onlyutterly exceptionally, in 0.3 % of the population. All quantities studied (exceptextensibility) display moderate to strong positive skewness in comparison toGauss distribution. The most marked skewness is seen in the resilience. At thesame time, this quantity displays the highest value of non-Gaussian distribution.The elasticity module of 2.3±0.6 GPa is three times lower than the one reportedby other authors, yet according to the fact published in our work – which showsunambiguously that the thinner the hair, the higher elasticity module it displays– the value of 7.2 GPa for the 56 μm thick hairs is comparable and it confirms thehypothesis that the cortex, which is responsible for the mechanical strength of thehair, is contained in a higher ratio in thinner hairs. This similarly applies to theultimate strength; the linearity limit is hard to compare with literature, as it almostdoes not appear there. CONCLUSION: By measuring 886 samples from the headsof 60 adult women of European type, it was possible to ascertain the current normfor a larger number of mechanical parameters of the hairs. Further merit of thiswork is the fact that the hairs were taken systematically from five well-definedplaces of the studied heads in equal count, which is an aspect formerly publishedworks do not respect and they do not present the location of sampling.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

30202 - Endocrinology and metabolism (including diabetes, hormones)

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Neuroendocrinology Letters

ISSN

0172-780X

e-ISSN

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Volume of the periodical

38

Issue of the periodical within the volume

3

Country of publishing house

SE - SWEDEN

Number of pages

9

Pages from-to

199-207

UT code for WoS article

000406690100011

EID of the result in the Scopus database

2-s2.0-85045195589