Continuous Dynamics of the Hair Follicle: Spiral Model for Understanding Follicular Activity Throughout Life

December 2025 in “ Brazilian Journal of Hair Health ”

Ademir S. Carvalho, Alessandra Lopes da Silva Gonçalvez, Barbara Hortolan Camargo, Flavio Pereira Ramos, Josiene Matos Park, Lya De Fátima Cândido, Natalia Macedo Locati Bonasorte, Sandra Rojas Urquizas Moita, Vânia Pedroso Morais Chagas, Adriana Teixeira

hair follicle anagen phase effluviums alopecias trichology

TLDR The Spiral Model helps understand hair growth changes with age and identify hair problems early.

The document introduces a Spiral Model to better represent the continuous dynamics of the hair follicle throughout life, addressing limitations of the traditional annular model. This new model captures the temporal progression and physiological transformations of the hair cycle, including variations in the anagen phase duration with age. It serves as a reference for distinguishing between normal aging and pathological conditions like effluviums and alopecias, and aims to aid in the early identification of pathological changes and the optimization of therapeutic strategies in trichology.

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