This study identified new geometric and mechanical parameters for curly and kinky/coily hair, which may inform more effective personal care products tailored to these hair types.
4 citations
,
June 2021 in “Scientific Reports” This study found that examining hair morphology provides deeper insights than classification, suggesting a potential population stratification artefact between hair curvature and cross-sectional shapes in the examined admixed African-European sample.
6 citations
,
December 2018 in “International Journal of Cosmetic Science” In this study, hair samples from Mexican women were found to be intermediate in diameter and shape between Asian and Caucasian hair, exhibiting high intra- and inter-individual variability and unexpected levels of tensile damage.
28 citations
,
November 2018 in “Journal of structural biology” This study found statistically significant patterns in hair morphology and ultrastructure linked to biogeographic ancestry among European, African, and East Asian populations.
16 citations
,
June 2017 in “PLoS ONE” This small study reports that a 6-group geometric classification method is more reliable for classifying human hair curl, although a digital system could further reduce errors.
32 citations
,
March 2016 in “American Journal of Physical Anthropology” This study suggests that chemical methods can reveal subtle differences in scalp hair color variability across populations and emphasizes the need for enhanced understanding of hair fiber curvature.
2 citations
,
March 2014 in “Dermatologic Clinics” The editor suggests removing "race" and "ethnicity" from dermatology and creating tools to objectively assess skin color and hair texture.
28 citations
,
March 2014 in “Biological reviews/Biological reviews of the Cambridge Philosophical Society” This study introduces the multiple papillary centres model, offering a new explanation for hair twisting by combining known hair morphology features with differential growth rates caused by dermal papillae.
55 citations
,
February 2014 in “Journal of Structural Biology” This study observed that human hair macrofibrils predominantly exhibit a double-twist architecture with varying inter-macrofibril angles, advancing insights into their structural organization and mechanical implications.
10 citations
,
January 2012 in “Journal of biomedical optics” This study used ultrahigh-resolution optical coherence tomography to observe hair shaft structures, finding melanin granules absent only in white hair, which may explain color differences between black and white hair.
10 citations
,
January 2011 in “Journal of biomedical optics” This study found that optical coherence tomography provides highly reproducible and less variable measurements of hair shaft thickness compared to standard light microscopy, offering a promising noninvasive tool for clinical practice.
62 citations
,
December 2008 in “Journal of structural biology” This study found that in naturally curved human scalp hairs, distinct arrangements of cell types on either side of the hair fiber contribute to its curvature.
85 citations
,
October 2007 in “International Journal of Dermatology” In this study, researchers found that the curliness of human hair is associated with an asymmetric structure at the cellular level, particularly in the differentiation of the precortex.
95 citations
,
October 2007 in “International Journal of Dermatology” This study found that human hair can be classified into eight main types based on objective measurements of shape, rather than ethnic categories, enhancing the understanding of hair diversity globally.
95 citations
,
January 2007 in “Human biology” This study proposes a new, objective method to classify human hair into eight categories based on specific shape measurements, rather than traditional ethnicity-based classifications.
203 citations
,
June 2003 in “Journal of the American Academy of Dermatology” This article reviews the structure and chemistry of hair across ethnicities and how these factors affect hair properties and treatment responses, but reports no new research findings.
27 citations
,
September 1988 in “PubMed” In this study, researchers used three-dimensional reconstruction to show that the shape of the hair follicle determines the hair's form, with variations observed among different racial groups.
