www射-国产免费一级-欧美福利-亚洲成人福利-成人一区在线观看-亚州成人

Science and Health

Too little sleep raises obesity risk in kids

(Agencies)
Updated: 2010-09-09 15:38
Large Medium Small

Too little sleep raises obesity risk in kids
Children and teens take off from the starting line for the annual run/walk for patients and their friends and families at The Children's Hospital in Aurora, Colorado June 5, 2010. [Agencies]

NEW YORK -- Children aged four and under who get less than 10 hours of sleep a night are nearly twice as likely to be overweight or obese five years later, according to a US study.

Researchers from the University of California and University of Washington in Seattle looked at the relationship between sleep and weight in 1,930 children aged 0 to 13 years old who took part in a survey in 1997 and again five years later in 2002.

Related readings:
Too little sleep raises obesity risk in kids Obesity linked to lower sperm count in young men
Too little sleep raises obesity risk in kids Imported foods raise obesity, health issues for Pacific islanders
Too little sleep raises obesity risk in kids China faces big obesity challenge: researcher
Too little sleep raises obesity risk in kids Shanghai children face obesity problem

For children who were four years old or younger at the time of the first survey, sleeping for less than 10 hours a night was associated with nearly a twofold increased risk of being overweight or obese at the second survey.

For older children, sleep time at the first survey was not associated with weight status at the second survey but current short sleep time was associated with increased odds of a shift from normal weight to overweight status or from overweight or obese status at follow up.

Dr. Janice F. Bell from the University of Washington said this study suggested that early childhood could be a "critical window" when nighttime sleep helps determine a child's future weight status.      

According to the National Sleep Foundation, toddlers aged one to three years old should sleep for 12 to 14 hours a night; preschoolers, aged 3 to 5 years old, should sleep 11 to 13 hours, and 5- to 10-year-olds should get 10 to 11 hours. Teens should get 8.5 to 9.25 hours of sleep nightly.

Several studies have linked short sleep to excess weight in children and teens, Bell and fellow reseacher Dr. Frederick Zimmerman from the University of California noted in their report.

But many of these studies have been cross-sectional, meaning they looked at a single point in time, which makes it difficult to determine whether not getting adequate sleep caused a child to become obese, or vice versa.

These findings, said the researchers, suggest there is a critical time period prior to age five when adequate nightly sleep may be important in terms of a healthy weight later on.

Bell said the study, reported in the September issue of Archives of Pediatrics and Adolescent Medicine, couldn't show why short sleep in early life might be a risk factor for excess weight gain but there are a number of theories.

"It might be that kids who don't get enough sleep are a little bit too tired to engage in the amount of activity that they need," Bell said.

Being up longer could mean more opportunities to eat.

Finally, there's evidence that adults who don't get enough sleep have altered levels of the appetite- and hunger-related hormones leptin and ghrelin, and the same could be true in children, Bell said.

Too little sleep raises obesity risk in kids
US first lady Michelle Obama plays flag football with children, former NFL players and coaches during her "Let's Move" campaign to fight childhood obesity in New Orleans, September 8, 2010. [Agencies]

   Previous Page 1 2 Next Page  

主站蜘蛛池模板: 成年网在线观看免费观看网址 | 操操操网 | 一级a毛片免费观看 | 成人欧美视频在线观看播放 | 国产成人高清亚洲一区91 | 亚洲黄视频在线观看 | 中文字幕有码在线观看 | 国产一区二区在线视频 | 白嫩美女一级毛片免费看 | 一区二区三区四区在线视频 | 日本精高清区一 | 欧美jlzz18性欧美 | 久草资源免费 | 久久久久久久国产a∨ | 日本成人中文字幕 | 亚洲国产美女视频 | 亚洲国产日韩女人aaaaaa毛片在线 | 毛片在线视频在线播放 | 日本一极毛片兔费看 | 国产成人精品综合久久久软件 | 亚洲第一视频网站 | 久久久久国产精品免费网站 | 全国男人的天堂网站 | 在线国产三级 | 欧美在线视频一区二区 | 99视频在线免费观看 | 亚洲精品国产第一区第二区国 | 精品免费在线视频 | 精品一区二区三区在线视频观看 | 欧美人与鲁交大毛片免费 | 在线免费观看成年人视频 | 国产孕妇孕交一级毛片 | 日本特级视频 | 欧美精品日日鲁夜夜添 | 日韩美女强理论片 | 日韩国产精品99久久久久久 | 亚欧视频在线 | 国产日韩一区二区三区 | 综合在线亚洲 | 国产亚洲一区二区三区 | 在线观看亚洲 |