Geometric Classification of Scalp Hair for Valid Drug Testing, More Reliable Than Hair Curl Groups

June 2017 in “ PLoS ONE ”

Kwezikazi Mkentane, Jennifer C. Van Wyk, N. Sishi, Freedom Gumedze, Malebogo Ngoepe, Lester M. Davids, Nonhlanhla P. Khumalo

scalp hair hair curl geometric classification treatment compliance

Studysummary 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.

Automatically generated from the study's abstract, not written by a person, and not a review of the full paper. Not medical advice or a treatment recommendation. Read the original study, and consult a qualified healthcare professional before changing treatment. Full disclaimer

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research Dermal Papilla Cell Number Specifies Hair Size, Shape, and Cycling, and Its Reduction Causes Follicular Decline

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In this study, researchers found that the number of dermal papilla cells in hair follicles determines hair size and shape in mice, suggesting potential avenues for addressing hair loss.

research Keratins and Lipids in Ethnic Hair

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In this study, researchers found that higher concentrations of internal lipids in African hair may influence its keratin structure, as observed through various analytical methods.

research Curly Hair: Measured Differences and Contributions to Breakage

13 citations , November 2012 in “International Journal of Dermatology”

This study of African-American women found that those perceiving greater hair breakage showed lower break stress and higher premature failure rates, linked to grooming practices and hair curvature.

research The Physical Properties of Hair Fibers

7 citations , December 2011 in “Springer eBooks”

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Hair as a Retrospective Calendar of Cortisol Production—Increased Cortisol Incorporation into Hair in the Third Trimester of Pregnancy

research Hair as a Retrospective Calendar of Cortisol Production—Increased Cortisol Incorporation into Hair in the Third Trimester of Pregnancy

501 citations , October 2008 in “Psychoneuroendocrinology”

This study suggests that cortisol measured in human hair can effectively reflect increased production for up to six months, but its retrospective accuracy may be limited due to rapid decline in levels.

research Hair as a Retrospective Calendar of Cortisol Production – Increased Cortisol Incorporation into Hair in the Third Trimester of Pregnancy

23 citations , October 2008 in “Experimental and Clinical Endocrinology & Diabetes”

This study found that measuring cortisol in human hair can reflect increased cortisol production for up to six months, with the highest concentration in hair closest to the scalp.

research Measurement of Cortisol in Human Hair as a Biomarker of Systemic Exposure

567 citations , October 2007 in “Clinical and investigative medicine”

This study described a new assay for measuring cortisol in hair and found it may serve as a useful biomarker for long-term cortisol exposure, correlating with 24-hour urine cortisol levels in non-obese subjects.

research Worldwide Diversity of Hair Curliness: A New Method of Assessment

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.

research Shape Variability and Classification of Human Hair: A Worldwide Approach

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.

research Human Hair Form: Morphology Revealed by Light and Scanning Electron Microscopy and Computer-Aided Three-Dimensional Reconstruction

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.

research Glycation of Hair Protein in the Assessment of Long-Term Control of Blood Glucose

6 citations , January 1988 in “Japanese Journal of Medicine”

This study suggests that measuring glycation in hair may serve as a useful indicator of long-term blood glucose control in diabetic patients.