Radiographic joint space of the knee in healthy young adults.

The primary objective of this study was to characterize normal variation in radiographic joint space of the knee in a large sample of healthy young adults and to identify factors that contribute to this variation. We measured radiographic knee joint space in 279 skeletally mature subjects, age between 16 and 22 years, who participated in the Fels Longitudinal Study. Minimum joint space was measured in the medial and lateral knee compartments.

Is the MNA valid in different populations and across practice settings?

Objective: The MNA is a successful screening tool in geriatric medicine, but this success is in Europe or countries with Western health care practice settings. The MNA is not directly applicable in many ethnic groups or countries or those with non-Western cultural and dietary habits or health care systems. There is an increased prevalence of type 2 diabetes, the metabolic syndrome and obesity among the elderly; however, the MNA does not include questions or measures related to these or other important health conditions affected by nutritional status.

Quantitative genetics of cortical bone mass in healthy 10-year-old children from the Fels Longitudinal Study.

The genetic influences on bone mass likely change throughout the life span, but most genetic studies of bone mass regulation have focused on adults. There is, however, a growing awareness of the importance of genes influencing the acquisition of bone mass during childhood on lifelong bone health. The present investigation examines genetic influences on childhood bone mass by estimating the residual heritabilities of different measures of second metacarpal bone mass in a sample of 600 10-year-old participants from 144 families in the Fels Longitudinal Study.

Validity of a new automated software program for visceral adipose tissue estimation.

Introduction: Given the considerable time and research cost of analyzing biomedical images to quantify adipose tissue volumes, automated image analysis methods are highly desirable. Hippo Fat is a new software program designed to automatically quantify adipose tissue areas from magnetic resonance images without user inputs. Hippo Fat has yet to be independently validated against commonly used image analysis software programs.

Mandibular symphysis of large-bodied hominoids.

The hominoid mandibular symphysis has received a great deal of attention from anatomists, human biologists, and paleontologists. Much of this research has focused on functional interpretations of symphyseal shape variation. Here, we examine the two-dimensional cross-sectional shape of the adult mandibular symphysis for 45 humans, 42 chimpanzees, 37 gorillas, and 51 orangutans using eigenshape analysis, an outline-based morphometric approach.

Unique and common genetic effects between bone mineral density and calcaneal quantitative ultrasound measures: the Fels Longitudinal Study.

Introduction: Areal bone mineral density (BMD) and calcaneal quantitative ultrasound (QUS) measures are correlated, and both traits predict osteoporotic fracture risk independently. However, few studies have examined whether common genetic effects (i.e.

Do changes in body mass index percentile reflect changes in body composition in children? Data from the Fels Longitudinal Study.

Objective: Our aim was to examine the degree to which changes in BMI percentile reflect changes in body fat and lean body mass during childhood and how age and gender affect these relationships.

Methods: This analysis used serial data on 494 white boys and girls who were aged 8 to 18 years and participating in the Fels Longitudinal Study (total 2319 observations). Total body fat (TBF), total body fat-free mass (FFM), and percentage of body fat (%BF) were determined by hydrodensitometry, and then BMI was partitioned into its fat and fat-free components: fat mass index (FMI) and FFM index (FFMI).

Quantitative genetic analysis of blood pressure reactivity to orthostatic tilt using principal components analysis.

Blood pressure (BP) reactivity to orthostatic tilt may be predictive of cardiovascular disease. However, the genetic and environmental influences on BP reactivity to tilt have not been well examined. Identifying different influences on BP at rest and BP during tilt is complicated by the intercorrelation among multiple measurements.

Lipids, lipoproteins, lifestyle, adiposity and fat-free mass during middle age: the Fels Longitudinal Study.

Introduction: Although lipid profiles tend to worsen with age, it is not fully known if such age-related changes are influenced primarily by body composition and lifestyle or by other aspects of aging.

Objective: We investigated the extent to which the fat and fat-free components of body mass index (BMI) and lifestyle factors influence patterns of change in lipids independent of age.

Design: Serial data were analyzed using sex-specific longitudinal models.

Is sexual maturity occurring earlier among U.S. children?

Purpose: To compare the onset and completion of sexual maturation among U.S. children between 1966 and 1994.

Quantitative genetic analysis of blood pressure response during the cold pressor test.

Background: The genetic association between blood pressure (BP) at rest and during the cold pressor test (CPT) is not well characterized. The purpose of this study was to examine the genetic architecture of BP during the CPT, and to determine whether BP at rest and during the CPT share common genetic influences.

Methods: In 419 individuals distributed across four large families, variance components methods were used to estimate heritabilities of resting BP and CPT BP, along with genetic correlations among BP traits.

Quantitative genetic analysis of cellular adhesion molecules: the Fels Longitudinal Study.

Circulating concentrations of inflammatory markers predict cardiovascular disease (CVD) risk and are closely associated with obesity. However, little is known concerning genetic influences on serum levels of inflammatory markers. In this study, we estimated the heritability (h2) of soluble cellular adhesion molecule (sCAM) concentrations and examined the correlational architecture between different sCAMs.

Gene by smoking interaction: evidence for effects on low-density lipoprotein size and plasma levels of triglyceride and high-density lipoprotein cholesterol.

We seek to determine whether significant gene x smoking interaction effects exist on plasma triglyceride (TG) levels, HDL cholesterol (HDL-C) level, and median LDL particle diameter (LDL-MPD) in Mexican American families enrolled in the San Antonio Family Heart Study. The sample consisted of 1,392 individuals distributed in 42 extended pedigrees, ranging in age from 16 years to 92 years. Separate quantitative genetic analyses were carried out for TG and HDL-C level and LDL-MPD using a maximum-likelihood-based variance decomposition approach while simultaneously adjusting for age and sex.

Heritability of age at menarche in girls from the Fels Longitudinal Study.

Menarche is the hallmark maturational event of female childhood. Many studies indicated a significant genetic contribution to the timing of the onset of menstruation, but most of these studies were limited by the use of retrospective data and by the use of data from only certain types of relatives (i.e.

Early menarche and the development of cardiovascular disease risk factors in adolescent girls: the Fels Longitudinal Study.

The purpose of this study was to evaluate the influence of menarcheal age on changes in insulin, glucose, lipids, and blood pressure during adolescence and to assess whether body composition modifies this relationship. We examined 391 girls, a subset of Fels Longitudinal Study female participants (8-21 yr of age). Self-reported menarcheal age was classified based on the National Health and Nutrition Examination Survey III distribution, in which early menarche was at the 25th percentile or less (11.

Heritability of calcaneal quantitative ultrasound measures in healthy adults from the Fels Longitudinal Study.

Quantitative ultrasound (QUS) measurements of bone have been reported to predict osteoporotic fracture risk in postmenopausal women and older men. Although many studies have examined the heritability of bone mineral density (BMD), few studies have estimated the heritability of calcaneal QUS phenotypes. In the present study, we examined the genetic regulation of calcaneal QUS parameters in individuals from nuclear and extended families.

The belated autopsy and identification of an eighteenth century naval hero--the saga of John Paul Jones.

John Paul Jones, the "Father of the American Navy," is known for the battletime assertion that he had "not yet begun to fight." His central role in a triumph of scientific forensic identification more than a century after his death is less known. John Paul Jones died in 1792 and was buried in Paris, France.

Fifty-year trends in serial body mass index during adolescence in girls: the Fels Longitudinal Study.

Background: A decline in the age at menarche was recently reported for US girls. Although it is possible that this recent drop stems from the concurrent increase in childhood obesity, few longitudinal studies of growth and development have been undertaken to specifically address the temporal relation between growth, adiposity, and the age at menarche.

Objective: The objective was to simultaneously examine the effects of birth cohort (secular trend) and rate of maturation (age at menarche) on the timing and pattern of increases in body mass index (BMI) during adolescence in girls.

Telomeres and telomerase in the fetal origins of cardiovascular disease: a review.

Telomeres are noncoding functional DNA repeat sequences at the ends of chromosomes that decrease in length by a predictable amount at each cell division. When the telomeres become critically short, the cell is no longer able to replicate and enters cellular senescence. Recent work has shown that within individuals, telomere length tracks with cardiovascular health and aging and is also affected by growth variation, both prenatally and postnatally.

Recent decline in age at menarche: the Fels Longitudinal Study.

A number of recent reports suggest that the average age at menarche of US girls has declined over the past 20 years. Because the putative declines in the age at menarche are concurrent with increases in childhood body mass index (BMI), it has been suggested that these two trends may be causally linked. We examined differences in mean age of menarche in Fels Longitudinal Study girls who were born in six 10-year birth cohorts (1930s, 1940s, 1950s, 1960s, 1970s, and 1980s) and simultaneous cohort changes in mean BMI measured cross-sectionally at selected ages from 3-35 years (n = 371).

The availability of body composition reference data for the elderly.

A significant public health issue is the nutritional, functional and health status of the elderly, many of whom live to very old ages, and three-quarters are living in developing countries. The assessment of health and nutritional status for the elderly needs improving in order to reduce health care costs. Health, function, disease and disability are associated with amounts of bone, fat and muscle in the body s composition.

School-based obesity screening in rural Appalachia.

Background: Although identification of obesity during childhood is strongly recommended for the prevention of adult disease, access to obesity screening for children is almost exclusively through physicians' office visits. We examined the feasibility and utility of conducting a school-based obesity and cardiovascular disease (CVD) risk factor screening program in a rural Appalachian population.

Methods: Height, weight, blood pressure, total cholesterol (TC), and high-density lipoprotein (HDL) cholesterol were measured in 1338 fifth-grade children (631 boys and 707 girls) in 14 rural West Virginia counties in 2000-2001.

A life span approach to cardiovascular disease risk and aging: the Fels Longitudinal Study.

As the leading cause of chronic disease mortality in developed nations, cardiovascular disease is a widely prevalent condition that is integral to evaluation of aging populations. Chronic diseases such as coronary heart disease, hypertension and type 2 diabetes have been associated with adulthood body composition-namely excess body fat, altered lipid levels and elevated blood pressures. The Fels Longitudinal Study conducted at the Lifespan Health Research Center at Wright State University's School of Medicine has examined these same health status indicators-body composition, blood pressure, lipids, maturation, and hormones-during early life and their relationships to developing risk factors for these chronic diseases in adulthood.

Nutritional status assessed from anthropometric measures in the HEMO study.

Objective: Anthropometric methods are screening techniques for assessing nutritional stores of fat and lean tissues among persons with renal disease. This report presents cross-sectional baseline data on anthropometric indicators of nutritional status from a group of hemodialysis patients in a multicenter clinical trial, the Hemodialysis (HEMO) Study.

Design: The HEMO Study is a prospective, multicenter, randomized, 2 x 2 factorial clinical trial to evaluate the efficacy of the delivered dose of dialysis, defined by Kt/V, and membrane flux in reducing morbidity and mortality in (maintenance) hemodialysis patients.

Age at menarche and racial comparisons in US girls.

Background: Concern regarding change in the onset of sexual maturation of US girls has increased the need for current information on age at menarche from a national sample. Previous reports have been sparse and interpretation has been limited because of the racial composition and ages of the samples.

Objective: The objectives of this study were to estimate the distribution of age at menarche for all US girls and for non-Hispanic white, black, and Mexican American girls in the Third National Health and Nutrition Examination Survey and to test for racial differences.