Age, lifestyle and self-perceptions of hair : is there an association with hair diameter and tensile properties / Lane Duvel in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 41, N° 5 (10/2019)  

[article]  inINTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 41, N° 5 (10/2019) . - p. 509-515 Titre : Age, lifestyle and self-perceptions of hair : is there an association with hair diameter and tensile properties Type de document : texte imprimé Auteurs : Lane Duvel, Auteur ; A. Herbal, Auteur ; L. Daniels, Auteur ; R. Kong, Auteur ; Greg. G. Hillebrand, Auteur Année de publication : 2019 Article en page(s) : p. 509-515 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Âge Biophysique Epidémiologie Indice de masse corporelle Perception Tabagisme Index. décimale : 668.5 Parfums et cosmétiques Résumé : - Objective : To determine the association of age, lifestyle habits and the self‐perception of hair condition with the objectively measured physical properties of hair in Caucasian females with brown hair. - Methods : Hair biophysical properties, lifestyle habits data and self‐perceptions of hair condition were collected on 110 Caucasian females with brown hair ranging in age from 17 to 78. Hair diameter (cross‐sectional area) and tensile properties (elastic modulus, break strength and break extension) were measured at the root end of individual fibres (n = 100/subject) from the crown and frontal regions using objective instrumental methods. Other measures included body mass index (BMI) and Savin female pattern hair loss grades based on judging of standardized front, top and side view head images. Lifestyle habits and practices and self‐perceived hair condition were obtained via a standardized self‐assessment questionnaire. - Results : Hair fibre diameter and break extension decreased significantly with age. Hair fibre elastic modulus and Savin hair loss scores increased significantly with age. No age‐related change in hair fibre break stress was observed. A history of smoking or being overweight was significantly associated with having lower hair fibre cross‐sectional area but was not associated with any of the measured tensile properties. Subjects who perceived their hair as fine, thinning or weak had significantly lower cross‐sectional areas than subjects who did not. Subjects who perceived their hair to be healthy or strong had significantly higher cross‐sectional areas than subjects who did not. - Conclusion : The biophysical properties of hair change significantly with age. A history of smoking or being overweight was significantly associated with having smaller hair cross‐sectional area but was not associated with differences in hair tensile properties. The self‐perception of having strong or healthy hair seems more associated with having a larger cross‐sectional area than any real differences in hair strength. Note de contenu : - MATERIALS AND METHODS : Study design - Hair sample collection - Self-assessment questionnaire - Hair cross-sectional area and tensile properties - Hair density via savin female pattern hair loss grades - Body mass index - Statistics - RESULTS AND DISCUSSION : Hair cross-sectional area by age, scalp site and hormonal status - Hair tensile property changes DOI : 10.1111/ics.12569 En ligne : https://drive.google.com/file/d/1Rv8lJFUHuDPc9-B5OImxiCXWJpFwm8c6/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33231 [article]

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The age dependant changes in skin condition in japanese females living in northern versus southern japan / Greg. G. Hillebrand in IFSCC MAGAZINE, Vol. 4, N° 2 (04-05-06/2001)

[article]  inIFSCC MAGAZINE > Vol. 4, N° 2 (04-05-06/2001) . - p. 89-96 Titre : The age dependant changes in skin condition in japanese females living in northern versus southern japan Type de document : texte imprimé Auteurs : Greg. G. Hillebrand, Auteur ; Beverly Schnell, Auteur ; K. Miyamoto, Auteur ; Masamitsu Ichihashi, Auteur ; Reiko Shinkura, Auteur ; Suminori Akiba, Auteur Année de publication : 2001 Article en page(s) : p. 89-96 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Skin  Wrinkling  Hyperpigmentation  Photodamage  'Ultraviolet  radiation'  Sebum  Hydration  Imaging  Epidemiology Index. décimale : 668.5 Parfums et cosmétiques Résumé : Image analysis and biophysical methods were used to compare the skin condition of a group of females ranging in age from 5-65 years who had lived all of their lives in either Kagoshima prefecture (n=300), located in southern Japan, or Akita prefecture (n=302), located in northern Japan. Compared to Japanese women living in Akita, Japanese women living in Kagoshima had significantly longer facial wrinkles, higher number of wrinkles, larger hyperpigmented spots, higher number of spots, rougher facial skin texture, more yellow foreheads and upper inner arms, darker foreheads, and less stratum corneum hydration in the cheeks and arms. When compared on an age-for-age basis, the average 40 year-old Kagoshima women has the same level of facial wrinkling as a 48 year-old Akita women, an acceleration of 8 years for living in the more sunexposed southern latitude. For facial hyperpigmentation, the increase in onset is 16 years; the average 40 year-old Kagoshima women has the same level of facial hyperpigmentation as a 56 year-old Akita women. The results further testify to the skin damaging effects of sun exposure and may be useful in public health education to promote everyday sun protection. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10737 [article]

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The age-dependent changes in skin condition in african americans, asian indians, caucasians, east asians, and latinos / Greg. G. Hillebrand in IFSCC MAGAZINE, Vol. 4, N° 4 (10-11-12/2001)

[article]  inIFSCC MAGAZINE > Vol. 4, N° 4 (10-11-12/2001) . - p. 259-266 Titre : The age-dependent changes in skin condition in african americans, asian indians, caucasians, east asians, and latinos Type de document : texte imprimé Auteurs : Greg. G. Hillebrand, Auteur ; Mark. J. Levine, Auteur ; K. Miyamoto, Auteur Année de publication : 2001 Article en page(s) : p. 259-266 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Skin  'Racial  differences'  Aging  Imaging  Epidemiology Index. décimale : 668.5 Parfums et cosmétiques Résumé : Understanding the similarities and differences in skin characteristics as a function of age, race and geography should aid in the development of skin care products that better meet consumers’ skin care needs around the world. Several studies have compared various racial groups for specific skin parameters. This study is unique for its inclusion of live different racial/ethnic groups (African American, East Asian, Caucasian, Indian Asian, and Latino), its large base size (3160 subjects), its wide age range (10-70 years), and the breadth of skin parameters measured (both visible features and biophysical characteristics). Using the same image collection system in all geographies [London, Los Angeles, Rome, Akita (Japan)], high-resolution digital images of the subjects’ faces were collected under controlled conditions and computer analyzed to objectively quantify the amount of facial skin wrinkling, hyperpigmentation and pores. Biophysical skin parameters measured included: skin color (L*a*b) on the forehead and upper inner arm; sebum secretion rate on the forehead stratum corneum capacitance on the cheek, forearm and calf; skin surface pH on the cheek, forearm, and calf and surface flakes on the calf. In addition, all subjects completed a structured questionnaire to gather information on host and environmental factors such as body weight, smoking history, menopausal status, etc. Descriptive statistical analysis of the objectively measured skin parameters as well as an analysis of the host and environmental factors significantly associated with these skin parameters are presented. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10687 [article]

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Validation of a web-based imaging system for 'at-home' facial skin analysis / Greg. G. Hillebrand in IFSCC MAGAZINE, Vol. 16, N° 1 (01-02-03/2013)

[article]  inIFSCC MAGAZINE > Vol. 16, N° 1 (01-02-03/2013) . - p. 9-14 Titre : Validation of a web-based imaging system for 'at-home' facial skin analysis Type de document : texte imprimé Auteurs : Greg. G. Hillebrand, Auteur ; Bill Halas, Auteur ; Pat Lafleur, Auteur ; Frances Maddin, Auteur ; Mani Thomas, Auteur ; Richard Thomas, Auteur Année de publication : 2013 Article en page(s) : p. 9-14 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Dermatologie Imagerie (technique) Peau -- Rides Pigmentation, Troubles de la Taches pigmentaires (dermatologie) Télédermatologie Vieillissement cutané Index. décimale : 668.5 Parfums et cosmétiques Résumé : Facial imaging and quantitative image analysis of facial skin features, especially of those features associated with aging and beauty such as wrinkles and dark spots, are essential and routine in cosmetic science and aesthetic dermatology. However, these methods and services are reserved primarily for the research lab, clinic, spa or department store counter. Toward the goal of bringing this technology into the home, we have developed a web-based imaging system whereby facial images, captured using ordinary digital cameras and with modest attention to lighting, resolution and zoom, can be uploaded to a central server and analyzed for the severity of facial wrinkles and dark spots. Photographic standardization, essential for reproducible and quantitative image analysis, is aided by a universal headband worn during image capture. Functioning as an internal reference standard, color ships and other graphic information on the headband are employed by server-based software to verify image quality and make corrections for variation in lighting, resolution, and registration prior to image analysis. In this paper, we compare the web-based system's precision, accuracy, and linearity to a benchmark facial imaging system (VISIA). We also assess the system's utility for tracking changes in facial skin hyperpigmentation before and after dermatologic treatment. Note de contenu : - EXPERIMENTAL : Repeatibility - Accuracy and linearity - Differentiation and user acceptance - Image database - RESULTS AND DISCUSSION : Headband design - Image specifications and capture - Image upload - Image analysis - WBIS repeatibility - WBIS accuracy and linearity - WBIS differentiation Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17827 [article]

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