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Jumping for joy ... and stronger bones
August 28, 2008High impact activities such as jumping and skipping that can easily be incorporated into warm-ups before sports and physical education classes, have been shown to benefit bone health in adolescents.
The 10 minute school-based intervention, provided twice a week for about eight months, significantly improved bone and muscle strength in healthy teenagers compared to regular warm-ups.
"Eighty per cent of bone mass is accrued in the first 20 years and especially around puberty due to the circulating hormones. This study targets a window of opportunity in adolescence to maximise peak bone mass with high-intensity, weight-bearing activity."
The study of 99 adolescents with a mean age of almost 14 years found boys in the intervention group improved whole body bone mass while the girls' bone mass specifically improved at the hip and spine.
Boys in the bone-friendly warm-up group also lost significantly more fat mass than the other boys.
Mr Weeks said the gender-specific response to the exercise program may be related to the different rates of physical development with girls reaching maturity at an earlier age than boys.
"Peak height velocity is at different ages in boys and girls. Most boys in the group were right at that stage while most girls in the study were past puberty."
He said the improved bone strength at the hip and spine in girls was promising as those were the typical sites for osteoporotic fractures in the elderly.
While the study showed that a simple, practical exercise intervention can result in worthwhile skeletal benefits in adolescents, Mr Weeks said larger, longitudinal studies were required to determine whether the beneficial effects could persist into adulthood and reduce the risk of future bone fractures.
Research Australia
Physical Education Current Events and Physical Education News RSSIndiana U. at APHA: Studies about health education for people with ID, stability balls at work
An Indiana University study involving adults with intellectual disabilities found that the adults increased their personal health knowledge after taking a semi-weekly class for four weeks.
Indiana U. at APHA: Studies about why men and women use lubricants during sex
An Indiana University study involving 2,453 women ages 18 to 68 found that lubricant use during sexual activity alone or with a partner contributed to higher ratings of pleasurable and satisfying sex.
Physical education key to improving health in low-income adolescents
School-based physical education plays a key role in curbing obesity and improving fitness among adolescents from low-income communities, according to a new study led by researchers at the University of California, San Francisco and UC Berkeley.
Decrease in physical activity may not be a factor in increased obesity rates among adolescents
Decreased physical activity may have little to do with the recent spike in obesity rates among U.S. adolescents, according to researchers at the Johns Hopkins Bloomberg School of Public Health.
Exercise is good medicine for lymphoma patients
A healthy dose of exercise is good medicine, even for lymphoma patients receiving chemotherapy, University of Alberta researchers have found.
Puberty a gateway to heart disease for Canada's teens
A seven-year ongoing study examining over 20,000 Canadian grade 9 students shows most already have at least one major risk factor for heart disease and stroke, Dr. Brian McCrindle told the Canadian Cardiovascular Congress 2009, co-hosted by the Heart and Stroke Foundation and the Canadian Cardiovascular Society.
Places to play, but 'stranger danger' fears keep inner-city kids home: Study
Fear of dangerous strangers in inner-city neighbourhoods is keeping kids and teens from using playgrounds and parks to be physically active.
Orgasms, sexual health and attitudes about female genitals
An Indiana University study published in the September issue of the International Journal of Sexual Health found that women who feel more positively about women's genitals find it easier to orgasm and are more likely to engage in sexual health promoting behaviors, such as having regular gynecological exams or performing vulvar self-examinations.
Women living in group homes need to learn to make decisions about leisure time to enrich their lives
Most people don't think twice about the ability to choose the movie they want to watch, the book they want to read or with whom they will have coffee.
Prison gambling associated with crime, substance abuse when offenders re-enter community: Study
Parolees with a gambling habit may resort to criminal activities and substance abuse when they are released from prison if there are few community supports to help them re-integrate, a University of Alberta study has concluded.
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