Hair Weathering

I ran across this article a couple of months ago and meant to post it.  Enjoy.   

 

 How Hair Damage Makes the Least of What You Have
Source:
International Socieity of Hair Restoration
March, 2003

Magnification of weathered hair

Weathered hair shafts under the microscope

The wrinkled, bone-dry, parchment-like skin of a person who spends much of their life in the wind and sun is said to be “weathered”. While “weathering” is a term very familiar in association with skin, hair is also subject to cosmetic and structural damage that some experts call “weathering”. An example of weathered hair we all recognize is “surfer’s hair”—frazzled hair damaged and bleached by hours of soaking in salt water and exposure to the sun.

Weathered hair, like weathered skin, detracts from your appearance and makes you look older than your actual age.

Weathering that affects the hair shaft but not the hair follicle (the “root”) is a minor cause of hair loss. It is, however, a common cause of frazzled, hard-to-manage hair.

What is Hair Weathering and What Causes It?
Some structural breakdown occurs in scalp hair as a part of the normal growth-and-shed cycle (See Hair Growth Cycle and Hair Loss for more information). Over time in the normal hair growth cycle a hair tends to become shaggier in appearance as it ages; this is due to gradual breakdown of the structural proteins in the hair shaft.

The normal structural breakdown can be hastened and worsened by hair-damaging environmental factors and cosmetic procedures that contribute to “weathering”:

Excessive sunlight (ultraviolet) exposure can damage hair as well as it can damage skin. Wearing a head covering protects hair as well as skin from excessive ultraviolet exposure. In addition, there are sunscreen products made to be applied to the hair to prevent weathering. These products can be helpful if you spend a lot of time in the water.

Excessive wetting, especially in salt water, is damaging to hair. Sun and salt water are the combination that results in “surfer’s hair”. Vigorous combing or brushing of wet, tangled hair is tempting in order to put the tangled hair in order, but this should be avoided because vigorous combing or brushing is especially damaging to the hair shaft.

Chemical and physical damage caused by long-term permanent waving, hair curling and hair straightening can cause the type of hair-shaft damage that ““weathers” hair.

Chemical damage caused by bleaching, dyeing, and the use of degreasing shampoos can cause significant damage to the hair shaft.

Friction and physical hair-shaft injury caused by hard combing and brushing, braiding, and corn-rowing are significant causes of weathering, but this type of damage can also result in permanent hair loss due to traction alopecia (See Other causes of hair loss for more information).

Severely traumatic or frequent injury to the hair shaft disrupts the outer layer of the hair and allows the inner layer to splay out, making the hair hard to manage. Weathering damage can occur to hair without one’s knowledge. Hair has no nerve connections and thus cannot give one a feeling of pain when it is damaged—unlike skin that can become painful when it is sunburned or chapped. Nevertheless, hair is a complex structure like skin, with multiple layers that can be disrupted by environmental or cosmetic damage.

Under the microscope, the outer layer of a mature hair has a fish-scale appearance due to the overlapping layers of cuticle that cover underlying layers. Cuticle is a dense proteinaceous material that provides structure and protects softer layers underneath. As a hair ages and naturally “weathers”, these cuticle scales become jagged and break off. Physical and chemical (cosmetic) damage can hasten the degradation of cuticle.

When the outer cuticle layer of a hair becomes excessively “weathered”, the softer underlying layers are open to chemical or physical damage. Loss of the cuticle layer also allows underlying layers to lose structure and form ridges, fissures and nodules. Hair that has lost its structure is a common cause of frizzy, hard-to-manage hair.

We usually notice this “weathering” in scalp hair, but body hair can be similarly damaged by environmental factors and by hard scratching with fingernails.

Because so many environmental and cosmetic factors may be at work in the life of any one person, it may be difficult to point to one factor as “THE cause” of hair weathering. In rare instances, a genetic condition may contribute to breakage and frazzling of the hair shaft.

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: