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#1 31-05-2018 08:31:28

misshuana
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Date d'inscription: 14-07-2016
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n"" style=""transform: translate3d(0px Sebastian Perez World Cup Jersey , 0px, 0px);"">Kids who watch a lot of television may build less bone during critical years, and be more vulnerable to osteoporosis and bone breaks later in life as a result, a new study suggests.


Children and teens followed until age 20 - when bone mass is peaking - had lower bone mass at that age the more hours they had spent watching TV in childhood, researchers reported online July 4th in the Journal of Bone and Mineral Research.


“What we need to make clear is that it’s not necessarily the act of watching TV that is driving the link between TV and health outcomes, but the act of sitting for long periods,” said Natalie Pearson of the School of Sport Santiago Arias World Cup Jersey , Exercise and Health Sciences at Loughborough University in the U.K., who was not part of the new study.


“The first set of data collected on TV viewing in the current study was collected 15 years ago,” and since then more and more young people have started watching TV on demand, using iPads, smart phones and apps, she told Reuters Health by email.


For the study, led by Joanne A. McVeigh at Curtin University in Perth Roger Martinez World Cup Jersey , Australia, the parents of more than 1,000 Australian kids reported how much TV each child watched per week at ages 5, 8, 10, 14, 17 and 20 years - though at older ages the kids started to self-report their own TV watching habits.


Researchers sorted the kids into three groups based on their TV watching patterns over time: about 20 percent watched less than 14 hours of TV per week as children and teens and were considered consistent low-level watchers Robinson Zapata World Cup Jersey , more than 40 percent watched 14 or more hours per week as children and teens and were consistent high-level watchers, and 35 percent increased from low to high levels of TV watching per week over the years.


At age 20 the participants had X-ray scans to assess bone mineral content.


The researchers accounted for height, body mass, physical activity, calcium intake, vitamin D levels, alcohol Radamel Falcao World Cup Jersey , and smoking at age 20, and still found that kids who were consistently high-level TV watchers at younger ages had lower bone mineral content than others as adults.


Immobilization for prolonged period of time is detrimental to bone health, said Dr. Sebastien Chastin of Glasgow Caledonian University in the U.K., who was not part of the new study.


“Sitting watching television does two things, it takes away from being active, therefore we do not get the benefit of physical activity and second it immobilizes us for prolonged period of time which we know from bed rest studies triggers physiological response that change the balance in our body chemistry that keeps our bone strong,” Chastin told Reuters Health by email.


“Several studies have shown over the years that there is a relationship between the time we spend sitting and bone health Marlos Moreno World Cup Jersey ,” he added.


""Poor bone health ultimately can lead to osteoporosis (brittle bone disease) which affects over 200 million women worldwide,"" he said. “You can imagine that a fall on a brittle hip is more likely to result in fracture.”


Our bodies reach peak bone density around age 22, after which time bone density decreases over time, though we can slow the decrease by maintaining an active and healthy lifestyle, Chastin said.


“Impact sports (not contact) are the most beneficial for bone health,” he said, citing parkour or “free running” in particular for muscle strength Juan Guillermo Cuadrado World Cup Jersey , balance and coordination.


“It is often very difficult to make parents and doctors aware of the very long term health implications of sitting (at a screen or other sitting occasions such as school time, work time, travel etc.) for long periods, as in today’s society we are very interested in the immediate responses to our actions and not what will happen 20 years down the line,” Pearson said.


There are practical ways to break up periods of seated screen time, like getting up during ads or while working on a computer getting up to answer the phone instead of emailing a colleague or friend, she said.

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