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Glossary Hair Curvature

degree of curliness or straightness of hair strands

Hair curvature refers to the degree of curliness or straightness of hair strands. It is determined by the shape of the hair follicle and the distribution of keratin within the hair shaft. Curly hair typically has an oval or asymmetrical follicle, while straight hair has a round follicle. This characteristic can influence hair care practices and styling techniques.

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research Hair curvature: a natural dialectic and review

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.

research Single-Cell Transcriptomics Reveals the Molecular Anatomy of Sheep Hair Follicle Heterogeneity and Wool Curvature

10 citations , December 2021 in “Frontiers in cell and developmental biology”

This study used single-cell RNA sequencing to map the cellular composition of sheep hair follicles, revealing differentiation pathways and potential molecular mechanisms for wool curvature, which may inform sheep breeding.

research Changes of Curvature with Regain of Set Wool and Hair Fibers

7 citations , October 1963 in “Textile Research Journal”

Merino wool fibers change shape with moisture, while human hair shape stays the same.

research Variation and Heritability in Hair Diameter and Curvature in an Australian Twin Sample

5 citations , June 2016 in “Twin research and human genetics”

In this study, heritability analyses in twins and siblings revealed that genetic factors predominantly influence hair diameter and curvature, with notable sex differences in their genetic impact.

research A direct link betweenPrss53, hair curvature, and skeletal dysplasia

February 2019 in “bioRxiv (Cold Spring Harbor Laboratory)”

This study found that Prss53-mutated rabbits exhibited curved hair and skeletal dyskinesia, suggesting a link between Prss53 loss and these traits, potentially involving disrupted calcium metabolism.

research Efficacy and safety of Latilactobacillus curvatus LB-P9 on hair health: a randomized, double-blind, placebo-controlled clinical trial

5 citations , November 2024 in “Frontiers in Nutrition”

In this randomized controlled trial, oral intake of the probiotic Latilactobacillus curvatus LB-P9 significantly improved hair luster, elasticity, and participant satisfaction in individuals with mild to moderate hair damage compared to placebo, without significant adverse effects reported.

research Oral administration of Lactilactobacillus curvatus LB-P9 promotes hair regeneration in mice

November 2023 in “Food science of animal resources”

This study found that in mice, oral administration of Lactilactobacillus curvatus LB-P9 accelerated hair regrowth and increased hair thickness, hair follicle numbers, and dermal thickness, likely by boosting hair growth factor production and dermal papilla proliferation.

research An investigation of the association between structural proteins and lipids with scalp hair curvature

January 2025 in “Open University of Cape Town (University of Cape Town)”

This study found that lipids are highly correlated with hair curvature while proteins are not, reporting the largest number of hair lipids and identifying novel proteins and chaperones relating to different hair types for the first time.

research Human hair keratin network and 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.

research Cortical cell types and intermediate filament arrangements correlate with fiber curvature in Japanese human hair

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.

research DataSheet1_Single-Cell Transcriptomics Reveals the Molecular Anatomy of Sheep Hair Follicle Heterogeneity and Wool Curvature.zip

December 2021 in “INDIGO (University of Illinois at Chicago)”

This study used single-cell RNA sequencing to characterize 19 distinct cell populations in sheep hair follicles, uncovering differentiation signatures and intercellular communication that may influence wool curvature and sheep breeding.

research Intrinsic curvature in wool fibres is determined by the relative length of orthocortical and paracortical cells

27 citations , March 2018 in “Journal of Experimental Biology”

This study found that hair curvature in merino wool is influenced by differences in cell type length rather than the proportions of orthocortical and paracortical cells.

research Wanted, dead and alive: Why a multidisciplinary approach is needed to unlock hair treatment potential

21 citations , February 2019 in “Experimental Dermatology”

The authors conclude that optimizing hair shaft production and appearance may best be achieved by integrating biological, chemical, and physical intervention strategies.

research Characterization of curved hair of Japanese women with reference to internal structures and amino acid composition.

13 citations , October 2008 in “PubMed”

This study examined hair curvature in Japanese women, finding that 47% have curved hair, and identified structural differences in hair fiber, which resemble those in wool fibers.

research High-throughput phenotyping methods for quantifying hair fiber morphology

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.

research Taxonomy for the assessment of the subjective experience of curly hair manageability

1 citations , July 2024 in “International Journal of Cosmetic Science”

This study validated a new tool for assessing curly hair manageability, finding that hair curvature is a key factor influencing hair practices and product attitudes among women with natural curly hair.

research J. Cosmet. Sci., 59, 263–289 (July/August 2008) Characterization of curved hair of Japanese women with reference to internal structures and amino acid composition

July 2009 in “International Journal of Cosmetic Science”

This study found that 53% of Japanese women have straight hair while 47% have varying degrees of curved hair, with distinct structural differences observed in the internal makeup of curved hair fibers.

research 2P546 Structural Analysis of Curly and Straight Human Hair Fibers by Scanning Microbeam SAXS(52. Bio-imaging,Poster Session,Abstract,Meeting Program of EABS & BSJ 2006)

January 2006 in “Seibutsu Butsuri”

Curly and straight hair differ in how their internal fibers are arranged.

research J. Cosmet. Sci., 58, 629–636 (November/December 2007) Hair breakage during combing. IV. Brushing and combing hair

2 citations , September 2008 in “International Journal of Cosmetic Science”

This study found that brushing hair increases the ratio of long-to-short segment breaks compared to combing, with factors like bleaching and wet combing contributing to more long segment breaks.

research Development of predictive regression model for perceived hair breakage in Indian consumers

1 citations , March 2019 in “International Journal of Cosmetic Science”

In this study, researchers developed a regression model that reasonably predicts consumer-perceived hair breakage using various parameters such as hair smoothness, detangling forces, extensional strength, and hair density among Indian women.

research Quantifying variation in human scalp hair fiber shape and pigmentation

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.

research Changes in structure and geometric properties of human hair by aging

21 citations , July 2010 in “International Journal of Cosmetic Science”

This study found that hair luster decreases with age in Japanese females, primarily due to an irregular increase in fiber curvature which affects hair alignment.

research The Value of Long Hair Preview in Body Hair Transplantation

November 2022 in “Hair transplant forum international”

This article describes specific cases of body hair transplantation using long hair grafts, reporting that this technique may produce natural results by considering hair characteristics, curvature management, and strategic placement.

research Adverse reaction to isotretinoin: alteration of the hair shaft structure

January 2022 in “Surgical & Cosmetic Dermatology”

This case report described a rare instance of new curly hair growth in a patient undergoing isotretinoin treatment for acne vulgaris, highlighting the potential for isotretinoin to alter hair fiber curvature.

research Studies of light scattering from ethnic hair fibers

7 citations , July 2004 in “International Journal of Cosmetic Science”

Different hair types from various ethnic groups affect hair shine due to characteristics like thickness and shape.

research PHYSICAL CHARACTERISTICS OF ANATOLIAN NATIVE GOAT DOWN-HAIR FIBERS IN COMPARISON WITH CASHMERE FIBER

3 citations , March 2019 in “Tekstil Ve Konfeksiyon”

This study found that the down-hair fibers of native goats in Turkey have similar characteristics to cashmere fibers, indicating potential for high-quality textile products as a substitute.

research Comprehensive analysis of the circular RNA expression profile and circRNA–miRNA–mRNA network in the goat skin with divergent wool curvature

December 2023 in “Animal research and one health”

This study investigated circRNA expression in Zhongwei goat skin at different growth stages and found that certain circRNAs, such as circRNA8782 and circRNA3173, may play roles in regulating wool curvature by affecting signaling pathways and fibroblast proliferation.

research Dermatoses common in blacks

22 citations , June 1977 in “Postgraduate Medicine”

This review discusses how certain skin disorders, pigmentation issues, and hair problems are more common in black individuals than white individuals and does not report new clinical results.

research High-throughput phenotyping methods for quantifying hair fiber morphology

1 citations , November 2020 in “bioRxiv (Cold Spring Harbor Laboratory)”

This study introduced a new high-throughput method for analyzing scalp hair morphology and found that quantifying hair form provides more accurate information than traditional classification based on racial categories, challenging the belief that cross-sectional morphology predicts hair curvature.

Analysis of lncRNAs Expression Profiles in Hair Follicles of Hu Sheep Lambskin

research Analysis of lncRNAs Expression Profiles in Hair Follicle of Hu Sheep Lambskin

17 citations , June 2020 in “Animals”

This study identified differentially expressed mRNAs and lncRNAs in Hu sheep hair follicles, suggesting certain genes and pathways are involved in the development of wool curvature patterns.