Improving Stable Isotopic Interpretations Made From Human Hair Through Reduction of Growth Cycle Error

February 2011 in “ American Journal of Biological Anthropology ”

Lana J. Williams, Christine D. White, Fred J. Longstaffe

human hair hair growth cycle isotopic analysis dietary variations growth phases metabolic assessments

Studysummary This study observed that eliminating positional error in hair segment analysis can improve understanding of changes in isotopic composition, aiding the identification of pathological conditions and dietary patterns.

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Research cited in this study

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research Exogen Hair Characterization in Human Scalp

35 citations , March 2007 in “Skin Research and Technology”

In this study, researchers developed a non-invasive method to distinguish exogen hair from telogen hair on the human scalp, finding that normal exogen hair levels are generally less than seven hairs per cm².

research Chronic Telogen Effluvium: A Study of 5 Patients Over 7 Years

54 citations , January 2005 in “Journal of The American Academy of Dermatology”

In this study, four women with chronic telogen effluvium experienced fluctuating hair shedding without visible reduction in hair density or follicular miniaturization over at least 7 years.

research Decreased Serum Ferritin Is Associated With Alopecia in Women

163 citations , November 2003 in “Journal of Investigative Dermatology”

This study found that women with androgenetic alopecia or alopecia areata have significantly lower serum ferritin levels than those without hair loss, suggesting a potential link between these types of alopecia and decreased iron stores.

research Stress And The Hair Follicle

61 citations , March 2003 in “American Journal Of Pathology”

Stress can cause hair loss and skin issues by affecting hair growth cycles.

research Nutritional Factors and Hair Loss

239 citations , July 2002 in “Clinical and Experimental Dermatology”

This review explores the role of nutritional factors in hair loss, noting that iron and l-lysine supplementation may benefit some individuals, while excessive supplements can lead to hair shedding.

research Induction of the Hair Growth Phase in Postnatal Mice by Localized Transient Expression of Sonic Hedgehog

231 citations , October 1999 in “Journal of Clinical Investigation”

This study found that administering an adenovirus vector to increase Sonic hedgehog gene expression in mouse skin accelerated the transition of hair follicles into the growth phase, promoting hair growth.

research The Biology of Hair Follicles

1113 citations , August 1999 in “The New England Journal of Medicine”

This article discusses the biologic and psychosocial significance of hair, the current limitations in hair growth drugs, and anticipates future therapies based on advancing hair follicle research.

research What Controls Hair Follicle Cycling?

50 citations , August 1999 in “Experimental dermatology”

This review discusses the need for more research on how the chronobiological control systems regulate hair follicle cycling and reports no new results.

research Androgen Metabolism as It Affects Hair Growth in Androgenetic Alopecia

4 citations , April 1999 in “Dermatologic Clinics”

Androgens, like DHT, affect hair growth and treatments like finasteride may help.

Different Levels of 5α-Reductase Type I and II, Aromatase, and Androgen Receptor in Hair Follicles of Women and Men with Androgenetic Alopecia

research Different Levels of 5α-Reductase Type I and II, Aromatase, and Androgen Receptor in Hair Follicles of Women and Men with Androgenetic Alopecia

416 citations , September 1997 in “Journal of Investigative Dermatology”

People with hair loss have more androgen receptors and enzymes in certain follicles, with men and women showing different patterns.

Growth Factors and Cytokines in Hair Follicle Development and Cycling: Recent Insights from Animal Models and the Potentials for Clinical Therapy

research Growth Factors and Cytokines in Hair Follicle Development and Cycling: Recent Insights from Animal Models and the Potentials for Clinical Therapy

100 citations , November 1996 in “Molecular Medicine Today”

This review discusses the role of growth factors and cytokines in hair follicle development and cycling, but reports no new clinical findings on treatments for hair growth disorders.

research Human Hair Growth In Vitro: A Model for the Study of Hair Follicle Biology

133 citations , July 1994 in “Journal of Dermatological Science”

In this study, the researchers developed an in vitro model that maintains human hair follicles to grow at in vivo rates and observed that factors like EGF and IGF-I influence hair follicle growth and catagen entry.

research The Hair Cycle And Its Regulation

38 citations , October 1988 in “Clinics in Dermatology”

This article reviews the historical development of understanding the hair growth cycle, particularly anagen, catagen, and telogen phases, and reports no new clinical findings.

research Measurement of Hair Growth

26 citations , March 1986 in “Clinical and Experimental Dermatology”

Scalp hair grows at 0.37 mm/day, forearm hair at 0.18 mm/day, and thigh hair at 0.30 mm/day, with no significant differences found in people with certain hair conditions.