Monthly changes in hair growth parameters of Chinese subjects, observed along a full year.

Int J Cosmet Sci. 2014 Jul 26. doi: 10.1111/ics.12151. [Epub ahead of print]
Monthly changes in hair growth parameters of Chinese subjects, observed along a full year.
Liu C1, Yang J, Qu L, Gu M, Liu Y, Gao J, Collaudin C, Loussouarn G.

OBJECTIVE:
In order to confirm the existence of seasonal hair growth cycle among Chinese subjects and objectivize the seasonal effect of hair loss, the hair growth 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.