Studies of Growth Throughout the Lifespan in Japanese: Growth And Size of Nails and Their Relationship to Age, Sex, Heredity, and Other Factors

Hamilton, James B.; Terada, Harumi; Mestler, Gordon E.

doi:10.1093/geronj/10.4.401

Cited by 98 publications

(29 citation statements)

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“…In fact, Dawber et al [2001] reported influences upon nail growth, and cited youth as a factor for faster nail growth rate and old age as a factor for slower nail growth. Our findings are somewhat in accordance with Hamilton et al [1955], who reported peak values for growth rate in 10-to 14-year-olds and a decline after the second decade of life; but in contrast to de Berker et al [2007], who stated that children under 14 years of age have faster nail growth than adults.…”

Section: Factors Associated With Nail Fluoride Concentrationsupporting

confidence: 92%

“…In both studies, data were obtained from small numbers of subjects (52 and 10, respectively), age was analyzed only for a short range of months (22-37 months) in the former report and was not evaluated in the latter. In contrast to McDonnell et al [2004], a decrease in nail growth rate with aging was shown by Hamilton et al [1955]. Further investigation is needed to determine whether and how age affects nail growth, and whether growth rate affects the nail F concentration.…”

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confidence: 65%

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Environmental and Individual Factors Associated with Nail Fluoride Concentration

et al. 2009

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Nails have been suggested as suitable biomarkers of exposure to F, with the advantage of being easily obtained. The effect of water F concentration, age, gender, nail growth rate and geographical area on the F concentration in the fingernail and toenail clippings were evaluated. Volunteers (n = 300) aged 3–7, 14–20, 30–40 and 50–60 years from five Brazilian communities (A–E) participated. Drinking water and nail samples were collected and F concentration was analyzed with the electrode. A reference mark was made on each nail and growth rates were calculated. Data were analyzed by ANOVA and linear regression (α = 0.05). Mean water F concentrations (± SE, mg/l) were 0.09 ± 0.01, 0.15 ± 0.01, 0.66 ± 0.01, 0.72 ± 0.02, and 1.68 ± 0.08 for A–E, respectively. Mean F concentrations (± SE, mg/kg) ranged between 1.38 ± 0.14 (A, 50–60 years) and 10.20 ± 2.35 (D, 50–60 years) for fingernails, and between 0.92 ± 0.08 (A, 14–20 years) and 7.35 ± 0.80 (E, 50–60 years) for toenails. Among the tested factors, geographical area and water F concentration exerted the most influence on finger- and toenail F concentrations. Subjects of older age groups (30–40 and 50–60 years) from D and E showed higher nail F concentrations than the others. Females presented higher nail F concentration than males. Water F concentration, age, gender and geographical area influenced the F concentration of finger- and toenails, and hence should be taken into account when using this biomarker of exposure to predict risk for dental fluorosis.

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Section: Factors Associated With Nail Fluoride Concentrationsupporting

confidence: 92%

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confidence: 65%

Environmental and Individual Factors Associated with Nail Fluoride Concentration

et al. 2009

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“…Though small, the differences were statistically significant (One-way between-groups ANOVA, p<0.01 for all the digits in both genders). Ageing is known to influence the nail plate, which grows at a slower rate [12] and becomes thicker, less smooth and more longitudinally ridged [13]. In addition, nail cells are larger [14] and the nail plate's thermal diffusivity, trans-onycheal water loss and composition, of for example, lipids, calcium and magnesium change upon aging [15][16][17][18][19][20].…”

Section: Results and Discussion Summary Statisticsmentioning

confidence: 99%

Transverse fingernail curvature in adults: a quantitative evaluation and the influence of gender, age, and hand size and dominance

Murdan

2011

International Journal of Cosmetic Science

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2 SYNOPSISThe nail plate's convex shape in both the longitudinal and transverse directions is thought to contribute to its mechanical rigidity, and overcurvature can be a symptom of local and/or systemic disorders. While a number of methods to measure the longitudinal nail curvature have been proposed, evaluation of the transverse nail curvature has been largely limited to visual estimation of overcurved nail plates. The aim of this study was therefore to measure the transverse curvature of healthy adult fingernail plates, and thereby provide a baseline range for 'normal curved' nail plates. In addition, the influence of gender, age, hand size and hand dominance on the transverse fingernail curvature was investigated. The transverse fingernail curvature in 92 males and 90 females (aged 21-90 years) was measured using a set of radius gauges, and the nail plate curvature was expressed as the radius of a circle whose curve most closely approximated that of the nail plate. ANOVA was used to investigate the influence of digit nature on curvature, while general linear model was used to assess the influence of gender, age, and hand length, breadth and dominance on transverse nail curvature. Subsequently, the influence of hand dominance and age were further examined by paired t test and ANOVA respectively. In this paper, baseline values for the transverse nailplate curvature of the thumb, index, and middle, ring and little fingers are presented. The thumbnail is the flattest, followed jointly by the index and middle fingernails, then the ring fingernail and finally the little fingernail. Transverse nail curvature is influenced by a person's gender, age, hand dominance and hand width, but not by hand length. Thus, nails are flatter in the dominant hand, in males, in older individuals, and in those with wider hands.

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“…Actual growth rate is dependent upon age, gender, season, exercise level, diet, and hereditary factors [30]. Fingernails require about three to six months to regrow completely [24].…”

Section: Fingernail Growth Ratementioning

confidence: 99%

Determination of amphetamine-type stimulants, ketamine and metabolites in fingernails by gas chromatography–mass spectrometry

Kim

Shin

2010

Forensic Science International

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Studies of Growth Throughout the Lifespan in Japanese: Growth And Size of Nails and Their Relationship to Age, Sex, Heredity, and Other Factors

Cited by 98 publications

References 0 publications

Environmental and Individual Factors Associated with Nail Fluoride Concentration

Environmental and Individual Factors Associated with Nail Fluoride Concentration

Transverse fingernail curvature in adults: a quantitative evaluation and the influence of gender, age, and hand size and dominance

Determination of amphetamine-type stimulants, ketamine and metabolites in fingernails by gas chromatography–mass spectrometry

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