Kunz Michael, Seifert Burkhardt, Trüeb Ralph M
Department of Dermatology, University Hospital of Zürich, Zürich, Switzerland.
Dermatology. 2009;219(2):105-10. doi: 10.1159/000216832. Epub 2009 Apr 29.
A number of otherwise healthy women with or without clinical alopecia complain of recurrent hair loss, presumably reflecting seasonality in the growth and shedding of hair.
To test the hypothesis that periodicity in hair shedding reflects seasonal changes in human hair growth.
Retrospective case study over a period of 6 years of apparently healthy women with the complaint of hair loss. All underwent biochemical investigations, and trichograms were made.
After exclusion of patients with a disease or on drugs known to cause hair loss, 823 women remained. Analysis of trichograms demonstrated annual periodicity in the growth and shedding of hair, manifested by a maximal proportion of telogen hairs in summer. A second peak seems to exist, though it is less pronounced, in spring. The telogen rates were lowest in late winter.
These results confirm the findings of former authors who have indicated seasonal changes in human hair growth, though this is the first study performed systematically in a representative number of women.
许多身体健康、有或没有临床脱发症状的女性抱怨反复脱发，这可能反映了头发生长和脱落的季节性。
检验脱发的周期性反映人类头发生长季节性变化这一假设。
对6年间主诉脱发的明显健康女性进行回顾性病例研究。所有患者均接受了生化检查并进行了毛发显微镜检查。
排除患有已知会导致脱发的疾病或正在服用相关药物的患者后，仍有823名女性。毛发显微镜检查分析表明，头发的生长和脱落具有年度周期性，表现为夏季休止期毛发比例最高。春季似乎存在第二个峰值，不过不太明显。冬季末休止期发生率最低。
这些结果证实了先前作者指出的人类头发生长存在季节性变化的发现，尽管这是首次在具有代表性数量的女性中进行的系统研究。
