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Progressive decrease in hair diameter in Japanese with male pattern baldness

A Ishino1, M Uzuka, Y Tsuji

  • 1Department of Dermatology, Faculty of Medicine, Kyoto University, Japan.

The Journal of Dermatology
|March 11, 1998
PubMed
Summary
This summary is machine-generated.

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Male pattern baldness in Japanese men shows a slower progression than in Caucasians. Hair diameter significantly decreases annually, with a notable reduction in thicker hairs over three years.

Area of Science:

  • Dermatology
  • Trichology
  • Androgenetic Alopecia Research

Background:

  • Male pattern baldness (androgenetic alopecia) is a common condition affecting hair density and thickness.
  • Understanding ethnic variations in hair loss progression is crucial for targeted treatments.

Purpose of the Study:

  • To evaluate changes in hair diameter over three years in Japanese men with male pattern baldness.
  • To compare the progression rate with that observed in Caucasian populations.
  • To identify sensitive indicators for assessing hair loss and treatment efficacy.

Main Methods:

  • Longitudinal study involving 56 Japanese males with male pattern baldness.
  • Measurement of hair diameters and distribution analysis over a three-year period.
  • Quantification of the percentage of hairs exceeding 60 microns in diameter.

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Main Results:

  • Significant annual decrease in mean hair diameter (average 1.1 microns/year).
  • Shift in hair diameter distribution towards thinner hairs, with a decrease in thicker hair frequency.
  • Statistically significant 5.61% decrease in the percentage of hairs >60 microns over three years.
  • Observed vellus hair increase (3.6%) was slower than in Caucasians.

Conclusions:

  • Male pattern baldness progression in Japanese men appears slower compared to Caucasians.
  • The percentage of hairs with a diameter greater than 60 microns is a sensitive index for evaluating male pattern baldness progression.
  • This index can also be used to assess the efficacy of hair growth or hair loss preventive agents.