By Andrew McDougall, 24-Mar-2016
We normally associate hair loss, thinning and greying as markers of age, and a new study has now shown how ageing influences the diameter, surface topography, hardness, loss modulus, storage modulus, and tactile perception of human hair. A further understanding of the different properties of hair and the effects ageing can have can be useful to develop and evaluate better hair products and to advance the understanding of hair biology. In the study, carried out by the China University of Mining and Technology and published in the Journal of Cosmetic Science , research on the influence of ageing on hair properties was studied to enable a detailed understanding of the natural ageing process. The studies were carried out on three age group hair samples using a scanning electron microscope (SEM), a TriboIndenter and an artificial finger. Studying hair Three characteristic features of tactile perception that could reflect the perceptual dimensions of the fineness, roughness and slipperiness of hair were extracted, and the influences of ageing on the diameter, surface topography, nanomechanical properties, and tactile perception of hair were determined. The researchers found that in the three age group hair samples, the children's group hair samples have the smallest diameter, and that hair cuticles in the children and young adult groups were relatively complete and less damaged than in the elderly group, showing that surface structure of hair changes with ageing. The mechanical properties of hair also change with ageing, as the hardness and elastic modulus values of the elderly group hair samples were lower than those of the young adult group samples, indicating that ageing softens the hair surface. “The damage to the cuticle greatly degrades the mechanical properties of ageing hair. The hardness and elastic modulus values of children's hair are lower than those of adult hair due to the low cysteine, disulphide and fat contents, as well as the fineness of the hair,” says the study. The research also points to the elastic and viscous moduli of hair changing with cuticle layer, as the elastic properties are dominant compared to the viscous properties at the upper layer, but the latter becomes more obvious as the indent depth increases. “The tactile perception of hair [also] changes with ageing,” continues the study. “The change in hair tactile perception with age is related to the changes in the hair surface, lipid levels and mechanical properties.” Further understanding of these effects can lead to better developments in hair biology and for more targeted products, as well as providing dermatologists with several markers of considerable diagnostic importance, say the researchers. Hair ageing Hair can play an important role in people's overall physical appearance and self-confidence. Human hair is easily damaged by sun, heating, brushing, bleaching and colouring treatments. Also, as age increases, hair also begins to change. Compared with the external factors, internal factors such as ageing are less frequently studied. With ageing, the follicle becomes smaller and produces less melanin. Meanwhile, the oil glands shrink over time and cannot produce oil as efficiently. These changes will result in split ends, a grey colour, a brittle and coarse texture, and a dull and thin appearance. Greying, thinning, dryness and brittleness are the four main problems of ageing hair. Copyright - Unless otherwise stated all contents of this web site are © 2016 - William Reed Business Media SAS - All Rights Reserved - For permission to reproduce any contents of this web site, please email our Syndication department copyright@wrbm.com - Full details for the use of materials on this site can be found in the Terms & Conditions 5/25/2016 0 Comments History of Hair - The 1970sThe social revolution spawned in the 1960s took root in the '70s, and the standards of beauty reflected this upheaval. In fact, hair became the symbol of the era in more ways than one, evolving into perhaps the most powerful means of projecting an image or making a statement. For most of the decade, men and women of all ethnicities wore their hair long, natural and above all free. Farrah Fawcett's loose mane of freely falling curls, bronzed skin and glossy lips created a sensation in 1976, as did Olympic figure skater Dorothy Hamill's short-and-sassy wedge cut. Men adapted Farrah's "wingback" style into the center-parted, "feathered" hairstyles worn by teen idols such as Leif Garret and the Bee Gees. The Afro hairstyle remained popular and was also adopted by many white men and women, though a closer-cropped version, such as that worn by Muhammad Ali, was becoming fashionable. Toward the end of the decade the punk movement arose in opposition to the hippie-influenced values of the era. Punks created a deliberately shocking, provocative look that included spiked hairdos dyed bright fluorescent colors, shaved and tattooed scalps, facial piercings and spectacular makeup.
Next Month: The 1980s by Michelle Phan
Sometimes a good hair day vs. a bad hair day shouldn’t be blamed on the type of hair you have, but what the weather is or even where you live. Different climates can have different effects on hair depending on heat, moisture, and other natural factors. With the seasons rapidly changing, here are my tips for beautiful, healthy hair, no matter the weather!How to protect your hair from… Cold, Dry Air: Cold, crisp air can cause hair to dry out and become brittle. It can also lead to static strands, so make sure to keep it moisturized. If you notice an excess of static, try this quick trick. Another tip is to stay inside after washing your hair until it fully dries during the colder months, as wet hair is more prone to breakage. Wind: While windswept hair can have a perfectly tousled effect, wind-blownhair is a totally different story. Too much exposure to those breezy fall days can increase tangles and knots, leading to unruly hair. Quick fix: tuck your hair in your sweater until you get in doors, or use a silk scarf as a head wrap. Humidity: The more water vapor in the air, the more humid it will be. Excessive humidity is uncomfortable and takes a toll on hair. Humid weather causes strands to absorb more moisture and can actually change the length and look of your hair. One way to tame the effects of humidity, and the frizz that often comes with it, is to rinse your hair with cold water instead of warm in order to seal the cuticle. It will then lay flat instead of flying upward and out of control. Bonus: hitting your locks with a blast of cold water will also make it look shinier and sleeker! Rain: Rain often has similar frizz-ifying effects, and it can also cause hair to flatten out and become limp. To keep hair looking smooth post-rain, Preventionsuggests hydrating your hair prior to exposure, so the moisture from the rain doesn’t move up your strands. If you’re afraid of limp, lifeless hair, try a sleek up-do such as a bun or a low-maintenance braided look, and carry a comb in your purse just in case. Sun Damage: If your hair feels out of control or lackluster after a summer of sun exposure and dry weather, I suggest undoing some of the damage by returning moisture and nutrients to your tresses. Try one of these 3 DIY hair masks like the ones I shared here to jump-start the restoration process. Light, fresh and pretty damn fabulous
There’s no better way to celebrate the beginning of summer than with a fresh new cut. Between the soaring temps and frizz-inducing humidity, the less hair you have to deal with, the better. Here are eight ideas to help lighten things up. |
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