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Ageing and hair cycles

M Courtois¹, G Loussouarn, C Hourseau

¹L'Oreal, Laboratoires Recherche Appliquée et Développement, Clichy, France.

The British Journal of Dermatology

|January 1, 1995

Summary

Ageing affects scalp hair by shortening growth phases and hair diameter, prolonging resting periods. These changes, similar to male-pattern balding but less severe, lead to overall hair thinning.

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Area of Science:

Dermatology
Trichology
Human Aging

Background:

The phototrichogram is a non-invasive method for tracking individual hair growth cycles.
Understanding hair cycle dynamics is crucial for studying hair loss and aging effects.

Purpose of the Study:

To investigate the long-term effects of aging on human scalp hair cycles.
To compare age-related hair changes with male-pattern balding.

Main Methods:

Utilized the phototrichogram technique on 10 male subjects (balding and non-balding).
Conducted monthly observations over 8-14 years to monitor hair growth phases and diameter.
Analyzed data to identify age-related changes in hair cycle duration and hair shaft diameter.

Main Results:

Identified a reduction in hair growth duration and hair shaft diameter with aging, particularly in thicker hairs.
Observed a prolonged interval between telogen (resting) and anagen (growth) phases.
Noted that these aging effects contribute to progressive hair thinning.

Conclusions:

Aging significantly alters scalp hair cycles, leading to reduced hair density and thickness.
The observed changes resemble those in male-pattern balding but are generally less pronounced.
Phototrichogram is an effective tool for long-term hair cycle research.

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