Int J Cosmet Sci. 2014 Dec;36(6):531-6. doi: 10.1111/ics.12151. Epub 2014 Sep 3.

Changes in Chinese hair growth along a full year.

Liu C1, Yang J, Qu L, Gu M, Liu Y, Gao J, Collaudin C, Loussouarn G.

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Abstract

OBJECTIVE:

To confirm the existence of seasonal hair growth cycle among Chinese subjects and objectivize the seasonal effect of hair loss; the hairgrowth parameters of Chinese volunteers were followed monthly for an entire year on the same area of vertex.

METHODS:

The hair growth parameters of 41 Chinese volunteers (women and men), free from alopecia, were recorded monthly along an entire year using the phototrichogram technique.

RESULTS:

Results show an increased rate of telogen hairs (growing arrest) around August-September in the study group, as previously reported in European subjects albeit of a lower extent and remaining within the normal range of healthy head hair parameters. The possible effects of latitude and daylight duration are discussed.

CONCLUSION:

Data confirm that Chinese hairs present characteristics of the most developed and fast growing terminal fibres, as compared to other non-Asian ethnics.

© 2014 Society of Cosmetic Scientists and the Société Française de Cosmétologie.

KEYWORDS:

hair growth; hair treatment; phototrichogramme; skin physiology