From 1997 to 2009, 23,580 premenopausal women were followed for incident uterine leiomyomata. In 1997, participants reported on hair relaxer use (age at first use, frequency, duration, number of burns, and type of formulation). In the Black Women's Health Study, the authors assessed hair relaxer use in relation to uterine leiomyomata incidence. Hair relaxers are used by millions of black women, possibly exposing them to various chemicals through scalp lesions and burns. Wise, Lauren A Palmer, Julie R Reich, David Cozier, Yvette C Rosenberg, Lynn Hair relaxer use and risk of uterine leiomyomata in African-American women.
Copyright 2009 American Academy of Dermatology, Inc. A decrease in citrulline and glutamine has been associated with inflammation prospective studies are needed to investigate whether or how ' relaxers' induce inflammation. ' Relaxers' are associated with reduced cystine consistent with fragile damaged hair. It was not possible to analyze lye and no-lye ' relaxers' separately. Cystine levels in distal asymptomatic relaxed and symptomatic relaxed hair were similar to each other and to those in the genetic hair fragility disease trichothiodystrophy. In asymptomatic relaxed hair, cystine levels were higher in less frequently relaxed samples proximal to scalp: 7.5 mg/g (5.6-12) versus 3.3 mg/g (1.3-9.2) P =. Cystine levels (milligram per gram amino acid nitrogen) were similar in natural proximal and distal hair: 14 mg/g (range, 4-15 mg/g) versus 14 mg/g (range, 12-15 mg/g) P =. There was a decrease in cystine, citrulline, and arginine however, an increase in glutamine was found in all relaxed compared to natural hair. Differences in amino acid levels were assessed using either Wilcoxon rank sum test or matched-pairs signed-rank test. Biochemical analysis was performed by using a Biochrom 30 amino acid analyzer. With informed consent, included participants represented 3 groups: natural hair, asymptomatic relaxed hair, and symptomatic (brittle) relaxed hair.
To investigate the biochemical effects of ' relaxers' on hair. A recent study reported relaxed hair lengths much shorter than expected, suggesting increased fragility the potential for scalp inflammation and scarring alopecia remains unclear. ' Relaxers' are used by more than two thirds of African females to straighten hair, with easy grooming and increased length often cited as reasons. Khumalo, Nonhlanhla P Stone, Janet Gumedze, Freedom McGrath, Emily Ngwanya, Mzudumile R de Berker, David ' Relaxers' damage hair: evidence from amino acid analysis. If you have a bad reaction to hair dyes and relaxers, you should: Stop using the. For Consumers Consumer Information by Audience For Women Hair Dye and Hair Relaxers Share Tweet Linkedin Pin it More sharing.
0 kommentar(er)
