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

Abstract

The hair follicle represents one of the most dynamic structures of the human organism, characterized by continuous cycles of growth, regression and rest. Hair performs functions that transcend biological protection, assuming profound psychological and cultural meanings, relating to self-esteem and personal identity. The traditional hair cycle is divided into anagen, catagen and telogen phases. The traditional annular model represents this cycle as a repetitive circular process, presenting limitations in not capturing progressive transformations that occur with aging and succession of hair cycles.

To develop a spiral conceptual model that represents physiological follicular activity from birth to aging, establishing a reference for identification of pathological deviations such as effluviums and alopecias.

An integrative review of scientific literature on follicular biology, hair cycle and its variations throughout different life phases was conducted. From this analysis, a spiral conceptual model was developed representing the continuity and temporal progression of follicular activity under physiological conditions.

The proposed Spiral Model demonstrates the continuous dynamics of the hair cycle through anagen, catagen and telogen phases, evidencing natural variations in anagen phase duration according to age and highlighting constant follicle renewal throughout life. Unlike the traditional annular model, the spiral model emphasizes temporal progression and physiological transformations inherent to follicular aging, allowing clear distinction between physiological aging and pathological processes.

The Spiral Model constitutes an innovative conceptual tool for understanding physiological follicular activity, serving as a baseline reference for early identification of pathological alterations and optimization of therapeutic strategies in trichology.