不同年龄成人头发的变化

目的 观察不同年龄成人头发的变化,探讨反映人老化的参照指标.方法 根据入选标准和排除标准征集志愿者,并依据年龄分为4组.头顶指定区域拍照后利用图像分析软件检测头发密度以及黑发率.该区域内随机拔取10根头发,利用目镜测微尺测量发干直径和毛球直径.同时,根据毛囊形态计算不同生长时期毛囊率.结果 共有96名志愿者加入本研究,男44例,女52例,年龄30~78岁.头顶头发密度、毛干直径、毛球直径、生长期毛囊率和黑发率随着年龄的增加逐渐减小,休止期毛囊率及白发率增多,并且60岁以上组明显减小,与其他3个年龄组差异有统计学意义,各组内部分指标存在性别差异.相关分析发现,毛干直径与毛球直径呈显著正相关.结论 头发的一些变化可能作为评价人老化程度的参照指标.

The changes of hair growth with aging

Objective To investigate the changes of hair growth with the increase of age and to develop a new practical method to evaluate the extent of aging. Methods After the approval of the ethnic committee, 96 healthy volunteers (44 males, 52 females, aged 30 ~ 78 years) were recruited into the study and divided into 4 groups based on the age: 30-group, 40-group, 50-group and 60-group. Macrophotographs were taken from the vertex. Hair density and percentages of black hairs were counted using Photoshop7.0 software. Ten hairs were randomly plucked from the specified scalp area,and the diameters of hair shaft and hair bulb were examined by a micrometer. The percentages of the follicles, based on their morphology, at different phases of the hair cycle, were counted. Results With the increase of age, the hair density, diameters of hair shaft as well as hair bulb, the percentages of anagen follicles and grey hairs all decreased, while the percentages of telogen follicles and white hairs increased, and significant difference was found between the 60-group and other 3 groups. In each group, the difference between males and females was found only in some parameters. The diameter of hair bulb positively correlated with that of hair shaft. Conclusion This study suggests that the parameters of hair growth could be used to help rating the extent of aging.