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2004 APR 1 - (NewsRx.com & NewsRx.net) -- Many variables affect hair thickness and its other properties in aging women.
"The biological importance and/or significance of human hair color is unknown even though greying is obviously associated with aging. In order to further characterize hair pigmentation in relation with hair growth variables we evaluated 3 scalp sites (top of the head (T): left and right and occipital(O)) in 12 untreated menopausal women (age range: 49-66 years: average 59.63[+ or -]5.66) who presented complaining of hair loss and/or diffuse alopecia," investigators in Belgium report.
"Controls were 12 non menopausal sexually mature woman (7 age range 15 - 21 and 5 age range 38 - 48) not complaining of hair loss. One hair sample (whenever possible n=60) was taken one month after clipping from T and O on each person; menopausal women were sampled twice," stated D. Vanneste and colleagues, Skinterface.
"The following measures were performed with a light microscope: diameter (average min - max., micrometer), medulla (0%=absent to 100%=fully developed) and linear hair growth rate (mm/day). The hairs were categorized as pigmented (P) or non pigmented (white, W) as compared with a black and white reference card. A total of 3343 hairs were analyzed with 2-factor analysis of variance (ANOVA)."
"A global comparison (all hairs) showed that the average diameter of W hair (67.68 micrometer) exceeded that of P hair (57.41 micrometer) (p=0.0001) and this was maintained on all 3 scalp sites. In addition, the medulla of W hair (23.91%) appeared more developed than the medulla of P hair (12.21%) (p=0.0001) and was more expressed in W T hairs as compared with W O hairs (p=0.0325). There was also a significant interaction between site and pigmentation (p=0.0074). Growth rate of W hairs (0.38 mm/d) was higher than that of P hairs (0.35 mm/d) ...
Source: HighBeam Research, Many variables affect hair thickness and its other properties in...