The Diameter and Growth Phase of Hair in Relation to Age

Atkinson, Samuel C.; Cormia, Frank E.; Unrau, Shirley A.

doi:10.1111/j.1365-2133.1959.tb13429.x

Cited by 16 publications

(8 citation statements)

References 1 publication

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“…However, while Kim et al observed that reduction in hair diameter started from the 40s onward, this was not statistically significant [8]. Meanwhile, Trotter and Atkinson et al observed that in the white population hair diameter reached its peak during early adulthood and began to drop with increasing age [25,26]. Our study demonstrated decreased hair density with increasing age, but the level of reduction was not large enough to detect statistical significance until participants reached their 60s.…”

Section: Discussioncontrasting

confidence: 79%

Evaluation of Hair Density and Hair Diameter in the Adult Thai Population Using Quantitative Trichoscopic Analysis

Leerunyakul

Suchonwanit

2020

BioMed Research International

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The data of hair density and hair diameter in the Asian population, especially in Thais, are limited. We aimed to evaluate hair density and hair diameter of members of the Thai population at different scalp sites and to determine the effect of sex and aging as well as to compare the results with those in groups of other ethnicities. Healthy Thais whose hair examination findings were normal were evaluated. Two hundred and thirty-nine subjects participated in this study, of whom 79 were male and 160 were female. Hair density and hair diameter were analyzed at four different scalp sites using quantitative trichoscopic analysis. The highest hair density in Thais was observed in the vertex area. Hair densities at four different scalp sites were significantly different from one another; only hair density at the vertex site showed no significant difference from that in the occipital area. In contrast, hair diameter did not show any statistically significant differences for the different sites. We observed decreased mean hair density with increasing age and found statistically significant differences between participants in their 20s and those in their 60s, while hair diameter remained consistent. Comparing our results with a previous study in other ethnicities, the hair densities in Asians are generally lower. In conclusion, hair density in the Thai population varies at different scalp sites. Aging is a factor in declining hair density. Asians have a lower hair density compared to Caucasian and African populations.

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Section: Discussioncontrasting

confidence: 79%

Evaluation of Hair Density and Hair Diameter in the Adult Thai Population Using Quantitative Trichoscopic Analysis

Leerunyakul

Suchonwanit

2020

BioMed Research International

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“…Age‐related differences in mean hair diameters and cross‐sectional areas have been described previously. Both Trotter 7 and Atkinson and colleagues 8 found the lowest values in children, rising to a peak in early adulthood and declining gently thereafter. Our results are consistent with these observations, although maximum hair diameters were seen a little later, suggesting that the mean hair diameter continues to increase until about 30 years of age.…”

Section: Discussionmentioning

confidence: 95%

Hair density, hair diameter and the prevalence of female pattern hair loss

2001

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Hair density in women is distributed as a normal variable, indicating that it is determined as a multifactorial trait. Women with female pattern hair loss have a hair density which falls below the mean but lies within the spectrum of the normal distribution, although other factors, including hair diameter, may affect the subjective impression of hair loss. The hair diameter data suggest that low hair density is not due to progressive diminution in hair follicle size and that follicular miniaturization may occur within the space of a single hair cycle.

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“…No statistical observations with regard to aging were conducted in similar studies by Tsuji (3) and Kususe (4). Atkinson et al (5) observed a change in hair diameter with age. The physical properties of human hair were also studied by Friederich and Fröb (6).…”

Section: Discussionmentioning

confidence: 99%

Changes in the Physical Properties of Human Hair With Age

Naruse

Fujita²

1971

J American Geriatrics Society

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With the use of Tensilon TIl apparatus for the measurement of tensile strength, stress-strain curves were drawn on human capital hair samples obtained from 81 healthy Japanese male subjects whose ages ranged from 2 to 91 years. The diameter of the hair showed a peak at 15 years of age, followed by a gradual decrease with advancing age. The breaking strength rose up to the age of 20 years; then it diminished with advancing age. The per cent extension at breaking and the amount of energy required until breaking also rose up to age 15 and then gradually declined. Young's modulus followed a secondpower function of a gradual fall up to age 15, followed by a gradual rise with advancing age.

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The Diameter and Growth Phase of Hair in Relation to Age

Cited by 16 publications

References 1 publication

Evaluation of Hair Density and Hair Diameter in the Adult Thai Population Using Quantitative Trichoscopic Analysis

Evaluation of Hair Density and Hair Diameter in the Adult Thai Population Using Quantitative Trichoscopic Analysis

Hair density, hair diameter and the prevalence of female pattern hair loss

Changes in the Physical Properties of Human Hair With Age

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