Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

'Extreme' teenagers

04.10.2007
Adolescents have grown taller and put on weight over the last thirty years, but the problem of underweight teens may be worse, a study in the online open access journal BMC Public Health suggests. An analysis of the height, weight, and body-mass index of teenagers during 1966-1969 and 1995-1997 in Norway demonstrates a shift towards taller and heavier teenagers, but also hints that there are more underweight adolescents.

Health researchers commonly use body mass index (BMI), calculated as weight in kilograms divided by the height in meters squared, in weight-related health studies. Sigrid Bjørnelv of the Norwegian University of Science and Technology and colleagues write that changes in these measurements across society over periods of time often reflect changes in nutrition. Better nutrition increases both height and weight, and reduces health problems connected with malnutrition. However, increases in BMI can also point to poor diet and lack of exercise.

Bjørnelv and her colleagues analyzed height, weight and calculated BMI data for 6774 14-18-year olds who participated in the Young-HUNT study in 1995-97. They compared the data with 8378 adolescents in the same age group collected by Norway's National Health Screening Service in 1966-69.

The researchers found significant changes between the two periods. Height and weight increased significantly in both sexes and all ages, while average (mean) BMI increased significantly in boys of all ages but only in 18-year old girls. Mean BMI did not change for girls aged 14-17 years. Critically, the team revealed a change in distribution of BMI, with an increase in the upper percentile values and a decrease in the lower percentile values.

While the increase in the highest percentile implies better nutrition and an increase in prevalence of obesity amongst adolescents in agreement with other studies, explains Bjørnelv, the decrease in the lower percentile values implies that the thinnest adolescents in 1995-97 had a lower BMI than their counterparts in 1967-69. This finding requires further study.

Charlotte Webber | alfa
Further information:
http://www.biomedcentral.com/bmcpublichealth/

More articles from Studies and Analyses:

nachricht New study: How does Europe become a leading player for software and IT services?
03.04.2017 | Fraunhofer-Institut für System- und Innovationsforschung (ISI)

nachricht Reusable carbon nanotubes could be the water filter of the future, says RIT study
30.03.2017 | Rochester Institute of Technology

All articles from Studies and Analyses >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: A quantum walk of photons

Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.

The quantum computer has fuelled the imagination of scientists for decades: It is based on fundamentally different phenomena than a conventional computer....

Im Focus: Turmoil in sluggish electrons’ existence

An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.

We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...

Im Focus: Wafer-thin Magnetic Materials Developed for Future Quantum Technologies

Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.

Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...

Im Focus: World's thinnest hologram paves path to new 3-D world

Nano-hologram paves way for integration of 3-D holography into everyday electronics

An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...

Im Focus: Using graphene to create quantum bits

In the race to produce a quantum computer, a number of projects are seeking a way to create quantum bits -- or qubits -- that are stable, meaning they are not much affected by changes in their environment. This normally needs highly nonlinear non-dissipative elements capable of functioning at very low temperatures.

In pursuit of this goal, researchers at EPFL's Laboratory of Photonics and Quantum Measurements LPQM (STI/SB), have investigated a nonlinear graphene-based...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Marine Conservation: IASS Contributes to UN Ocean Conference in New York on 5-9 June

24.05.2017 | Event News

AWK Aachen Machine Tool Colloquium 2017: Internet of Production for Agile Enterprises

23.05.2017 | Event News

Dortmund MST Conference presents Individualized Healthcare Solutions with micro and nanotechnology

22.05.2017 | Event News

 
Latest News

Physicists discover mechanism behind granular capillary effect

24.05.2017 | Physics and Astronomy

Measured for the first time: Direction of light waves changed by quantum effect

24.05.2017 | Physics and Astronomy

Marine Conservation: IASS Contributes to UN Ocean Conference in New York on 5-9 June

24.05.2017 | Event News

VideoLinks
B2B-VideoLinks
More VideoLinks >>>