Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Childhood obesity may contribute to later onset of puberty for boys

02.02.2010
U-M study finds increased body fat in boys may predict later onset of puberty

Increasing rates of obese and overweight children in the United States may be contributing to a later onset of puberty in boys, say researchers at the University of Michigan.

In a new study published in the February issue of the Archives of Pediatrics and Adolescent Medicine, researchers show that a higher body mass index during early and mid-childhood for boys is associated with later onset of puberty. This is one of the first longitudinal studies in the U.S. to examine the association between weight status and timing of puberty in boys.

“We found that increased body fatness is associated with a later onset of puberty in boys, the opposite of what we have seen in girls, as heavier girls tend to develop earlier, rather than later. Our study shows that the relationship between body fat and timing of puberty is not the same in boys as it is in girls,” says U-M pediatric endocrinologist Joyce M. Lee, M.D., M.P.H. and the study’s lead author.

With childhood obesity rates more than doubling in the U.S. during the past two decades, it has become increasingly important to better understand the ways in which excess body fat can impact children’s growth and development, she adds.

“Although there have been a number of longitudinal studies looking at the link between body fat and puberty in girls, few studies have been performed in boys. The results of our study suggest that excess weight may lead to a later onset of puberty in boys. Our findings have important implications for understanding sex differences in physiological mechanisms of puberty,” says Lee, assistant professor in the Department of Pediatrics and Communicable Diseases.

To study the association between weight and the onset of puberty, Lee and her colleagues looked at 401 boys from diverse socioeconomic backgrounds in 10 regions of the U.S. using data from the National Institute of Child Health and Human Development Study of Early Child Care and Youth Development. The study recruited full-term singleton children born in 1991 in 10 geographic areas and measured their height and weight from ages 2 to 12 years.

The study examined children’s body mass index (BMI) trajectories, which is the way children’s body fatness changes over the course of childhood. Children were divided into low, intermediate, and high body mass index (BMI) trajectories. Children in the low group were on the thinner side throughout childhood, while children in the high group were on the heavier side. Of boys in the low BMI trajectory group (91 boys), 7 percent had later onset of puberty. Of boys in the intermediate BMI trajectory group (196 boys), 13.3 percent had later onset of puberty. Of boys in the high BMI trajectory group (114 boys), 14 percent had later onset of puberty.

Puberty was measured by Tanner genitalia staging. There are five stages of puberty in the Tanner scale, which looks at testicular and penis growth. Boys who were in Stage 1, defined as a lack of genital development by 11 ½ years of age, were defined as having later onset of puberty.

“Given the recent childhood obesity epidemic, additional studies are needed to further investigate the epidemiological link between fat and pubertal initiation and progression in boys as well as physiological mechanisms responsible,” Lee says.

In addition to Lee, co-authors are Danielle Appugliese, M.P.H., of the Boston University School of Public Health; Niko Kaciroti, Ph.D., and Julie C. Lumeng, M.D., of the University of Michigan; Robert F. Corwyn, Ph.D., of the University of Arkansas, and Robert H. Bradley, Ph.D., of Arizona State University.

The study was funded by grants from the National Institute of Child Health and Human Development and the American Heart Association.

Journal reference: ArchPediatrAdolescMed. 2010;164(2):1-6

Written by Margarita Bauza-Wagerson

Margarita Bauza-Wagerson | University of Michigan
Further information:
http://www.umich.edu

Further reports about: BMI End User Development Human vaccine body fat body mass health services

More articles from Health and Medicine:

nachricht Study suggests possible new target for treating and preventing Alzheimer's
02.12.2016 | Oregon Health & Science University

nachricht The first analysis of Ewing's sarcoma methyloma opens doors to new treatments
01.12.2016 | IDIBELL-Bellvitge Biomedical Research Institute

All articles from Health and Medicine >>>

The most recent press releases about innovation >>>

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

Im Focus: Novel silicon etching technique crafts 3-D gradient refractive index micro-optics

A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.

Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...

Im Focus: Quantum Particles Form Droplets

In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.

“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...

Im Focus: MADMAX: Max Planck Institute for Physics takes up axion research

The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.

The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...

Im Focus: Molecules change shape when wet

Broadband rotational spectroscopy unravels structural reshaping of isolated molecules in the gas phase to accommodate water

In two recent publications in the Journal of Chemical Physics and in the Journal of Physical Chemistry Letters, researchers around Melanie Schnell from the Max...

Im Focus: Fraunhofer ISE Develops Highly Compact, High Frequency DC/DC Converter for Aviation

The efficiency of power electronic systems is not solely dependent on electrical efficiency but also on weight, for example, in mobile systems. When the weight of relevant components and devices in airplanes, for instance, is reduced, fuel savings can be achieved and correspondingly greenhouse gas emissions decreased. New materials and components based on gallium nitride (GaN) can help to reduce weight and increase the efficiency. With these new materials, power electronic switches can be operated at higher switching frequency, resulting in higher power density and lower material costs.

Researchers at the Fraunhofer Institute for Solar Energy Systems ISE together with partners have investigated how these materials can be used to make power...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ICTM Conference 2017: Production technology for turbomachine manufacturing of the future

16.11.2016 | Event News

Innovation Day Laser Technology – Laser Additive Manufacturing

01.11.2016 | Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

 
Latest News

UTSA study describes new minimally invasive device to treat cancer and other illnesses

02.12.2016 | Medical Engineering

Plasma-zapping process could yield trans fat-free soybean oil product

02.12.2016 | Agricultural and Forestry Science

What do Netflix, Google and planetary systems have in common?

02.12.2016 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>