Longitudinal growth of stature in boys according to age and puberty: Prediction of adult stature from the age of 13 years.

Background: The purpose of this study was to cross-validate and demonstrate how adult stature can be predicted in 13-year-old teenager's boys by using a new reference specific growth curve obtained from chronological age and maturity.

Methods: Stature measurements of 125 boys aged from 12 to 17.5 years were obtained over a period of five consecutive years.

Measuring body fat-How accurate is the extrapolation of predictive models in epidemiology?

Excess fat is a risk factor for many chronic diseases which can lead to premature mortality. Many studies have proposed predictive equations for body fat mass and body fat mass percentage based on anthropometric measures in relation to age and sex. However, the use of these predictive equations on other subject samples may not be relevant.

The same growth pattern from puberty suggests that modern human diversity results from changes during pre-pubertal development.

Patterns of human growth established for one population have rarely been tested in other populations. In a previous study, three growth curves from puberty were modelled for each sex in a longitudinal study of a Caucasian population based on stature, age at peak of growth and biological maturation. Each curve represents the canalisation of growth associated with the type of puberty.

Age Estimation of Teenage Boys During Puberty.

Background: Age estimation of a minor whose identity is unknown must be accurate enough to respond to judicial requests. The main objective of this study is to accurately determine a teenager's age from simple and reproducible criteria.

Samples And Methods: The first reference sample consists of 1720 measurements collected from 170 teenagers aged 11 to 16 years, over a period of 5 years.

Prediction of body fat in male athletes from ultrasound and anthropometric measurements versus DXA.

Background: To compare the accuracy of body fat percentage (BF%) measured by an ultrasound portable device and anthropometric measurements with a Dual energy X-ray absorptiometry (DXA) as the reference technique in male athletes.

Methods: A total of 100 athletes: 16 boxers, 4 rowers, 5 gymnasts, 6 base ball players, 19 judo players, 10 taekwondo players, 7 basket-ball players, 21 wrestlers, 6 cyclists on track and 6 karate expert aged from 18 to 30 years participated. All athletes were selected from the French National Institute of Sports and Physical Education.

Prediction of male basketball players' adult stature from the age of 13 years using chronological age and maturity.

Background: The purpose of this study was to cross-validate and demonstrate how adult stature can be predicted in 13-year-old basket-ball players by using a new reference specific growth curve obtained from chronological age, and maturity of sedentary boys.

Methods: The prediction of adult stature of young male basketball players was established from the results of a longitudinal study in which we developed from 125 sedentary boys aged from 12 to 17.5 years new growth curves using chronological and biological maturation.

Aerobic training suppresses exercise-induced lipid peroxidation and inflammation in overweight/obese adolescent girls.

This study aimed to determine whether aerobic training could reduce lipid peroxidation and inflammation at rest and after maximal exhaustive exercise in overweight/obese adolescent girls. Thirty-nine adolescent girls (14-19 years old) were classified as nonobese or overweight/obese and then randomly assigned to either the nontrained or trained group (12-week multivariate aerobic training program). Measurements at the beginning of the experiment and at 3 months consisted of body composition, aerobic fitness (VO2peak) and the following blood assays: pre- and postexercise lipid peroxidation (15F2a-isoprostanes [F2-Isop], lipid hydroperoxide [ROOH], oxidized LDL [ox-LDL]) and inflammation (myeloperoxidase [MPO]) markers.

Efficacy and safety of growth hormone treatment in children with hypochondroplasia: comparison with an historical cohort.

Background/aims: Hypochondroplasia (HCH) is a skeletal dysplasia characterized by disproportionate short stature. The aims of the study are to evaluate efficacy and safety of recombinant human growth hormone (r-hGH) therapy in HCH children, when compared with a historical cohort of untreated HCH children.

Methods: Nineteen HCH patients with an initial height standard deviation score (SDS) ≤-2 and a mean age of 9.

Body Fat Mass Assessment: A Comparison between an Ultrasound-Based Device and a Discovery A Model of DXA.

Objective. To examine measurement of body composition by ultrasound compared with a reference technique:dual energy X-ray absorptiometry (DXA). We evaluated the accuracy of a portable ultrasound-based device in estimating total body fat mass with those assessed by DXA in adult.

Age at menarche in a group of French schoolgirls.

Background: Mean age at menarche in France decreased from 12.78 years in 1979 to 12.6 years in 1994.

[Secular trends in anthropometrical measurements observed in three to 11-year-old French children between 1953 and 2005].

This study covers a fifty-year period between 1953 and 2005 and looks at secular trends in stature, weight and sitting height sizes among French boys and girls between the ages of 3 and 11. A special modelling in function to the age and variable for each child was established so that a comparison could be made in the kinetic growth patterns over these same two periods. Statistical analysis shows a significant increase in growth, of 0.

[Boxing: traumatology and prevention].

In 1986, a surgeon who, as an amateur boxer himself was concerned with boxers' health, approached a pioneering Parisian neuroimaging unit. Thus began a study in close cooperation with the French Boxing Federation, spanning 25 years. In a first series of 52 volunteer boxers (13 amateurs and 39 professionals), during which MRI gradually replaced computed tomography, ten risk factors were identified, which notably included boxing style: only one of 40 "stylists" with a good boxing technique had cortical atrophy (4.

Ultrasound measurement of total body fat in obese adolescents.

Background/aims: To compare body fat (BF) measurements obtained with a new ultrasound method with those assessed by dual-energy X-ray absorptiometry (DEXA) in obese adolescents.

Methods: In 94 adolescents (57 females and 37 males) aged 12-19 years and body mass index (BMI) exceeding 30 kg.m(-2), the z-score BMI for age was 6.

Influence of the weight status on bone mineral content and bone mineral density in a group of Lebanese adolescent girls.

Aim: The aim of this study was to determine the influence of being overweight on whole-body (WB) bone mineral content (BMC) and bone mineral density (BMD) in a group of Lebanese adolescent girls.

Methods: This study included 32 overweight (BMI>25 kg/m2) adolescent girls (15.3+/-2.

Ultrasound techniques applied to body fat measurement in male and female athletes.

Context: For athletes in disciplines with weight categories, it is important to assess body composition and weight fluctuations.

Objective: To evaluate the accuracy of measuring body fat percentage with a portable ultrasound device possessing high accuracy and reliability versus fan-beam, dual-energy X-ray absorptiometry (DEXA).

Design: Cross-validation study.

[Leptin, insulin, IGF-1 and bone mass in a group of sedentary adolescent girls].

Aim Of The Study: To investigate the relationships between serum leptin, IGF-1, insulin and bone mineral content and density in a group of Lebanese sedentary adolescent girls.

Methods And Results: Twenty Lebanese sedentary adolescent girls participated in our study. Total body bone mineral content and density were measured by dual-energy X-ray absorptiometry (DEXA).

Validation of ultrasound techniques applied to body fat measurement. A comparison between ultrasound techniques, air displacement plethysmography and bioelectrical impedance vs. dual-energy X-ray absorptiometry.

Aims: To evaluate the accuracy of body fat percentage (BF%) estimates from a portable, non-traumatizing ultrasound device with high accuracy and reliability compared to dual-energy X-ray absorptiometry (DEXA), the reference technique.

Design: Cross-validation between ultrasound technique (UT), DEXA, air displacement plethysmography (ADP) and bioelectrical impedance (BIA) was developed in the study.

Subjects: A total of 89 healthy subjects (41 women, 48 men), aged 48.

Optimal standards for fetal biometry: to each measurement its fitting model.

Objective: To determine the best mathematical model to construct charts of fetal abdominal circumference (AC) and femur length (FL).

Methods: Ultrasound measurements were made on 1,336 normal fetuses in one center. Four mathematical models were compared (a linear-quadratic model, a linear-cubic model, the Rossavik model and a new two-phase model, which has been found to best fit fetal head data).

[Average height of adolescents in the Dinaric Alps].

This study contributes to an update of average heights among European populations. Our investigation covering 2705 boys and 2842 girls aged 17 years, shows that, contrary to the general belief, adolescents of the Dinaric Alps are, on average, the tallest in Europe. With an average height of 185,6 cm, they are taller than Dutch adolescents (184 cm on average).

Only two-phase models, computed independently for males and females, are appropriate to describe fetal head growth.

Objective: To establish an accurate mathematical model describing fetal head growth, taking into account gender differences and changes in growth rate during gestation.

Methods: Ultrasound measurements of head circumference and biparietal diameter were made on 1,336 normal fetuses (684 males and 652 females) in the Maternité Régionale de Nancy (France). A new two-phase model, taking into account an alteration in growth kinetics at 30 gestational weeks, was computed independently for male and female data.