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LOS ANGELES, March 3 (Xinhua) -- More and more American adults are suffering from a decline in overall sleep duration, the U.S. Centers for Disease Control and Prevention (CDC) said on Thursday.It's recommended that adults should sleep seven to nine hours a night to maintain good health, but more than one-third of Americans do not meet that requirement, according to the CDC.Insufficient sleep poses a long-term heath threat and impairs work performance and the ability to drive safely, the CDC said.Chronic sleep loss also is associated with obesity, increased risk of death and other health problems, according to the CDC."Over the last 20 years there has been a decline in overall sleep duration in adults," said Lela McKnight-Eily, a clinical psychologist and epidemiologist at the CDC's National Center for Chronic Disease Prevention."Within our culture there seems to be a belief that sleep isn't a part of overall essential health," she said.McKnight-Eily and her colleagues studied the sleep habits of 74,571 adults in 12 states, 35.3 percent reported sleeping less than seven hours.In addition, 48 percent reported snoring, 37.9 percent said they fell asleep at least once during the day the previous month and 4.7 percent admitted to falling asleep at the wheel at least once.Drowsiness or nodding off while driving accounts for 1,550 deaths and 40,000 injuries a year, according to the U.S. Department of Transportation.To get enough sleep, Americans have to change lifestyle habits, including longer workdays and late nights on the computer, McKnight-Eily said, noting that too much screen time paring away much-needed sleep time.

ZHENGZHOU, Feb. 16 (Xinhua) -- China's Yellow River catchment authority has launched emergency measures to restrict industrial water usage and to release reservoir water for wheat crops in the face of a worsening drought.The Yellow River Flood Control and Drought Relief Headquarters raised on Wednesday its drought alert from yellow to orange, the second-highest level, indicating the area is facing the worst drought in up to half a century.The headquarters ordered all authorities along the catchment area to initiate an emergency response to ensure water supplies for people and livestock, and to restrict industrial water consumption.The drought, which has plagued the middle and lower reaches of the Yellow River since October last year, was likely to affect more than 40 percent of crops in the area, said a headquarters spokesman.Light to moderate snowfall brought some relief to the wheat farmers in the region over the weekend, but not enough to end the drought. Most regions along the Yellow River received precipitation of less than 10 mm.Thanks to the recent rise in temperatures, ice covering 120-km of the Yellow river has melted, offering more water for irrigation and other water uses.The headquarters' statistics show that water channeled from the Yellow River reached 228 cubic meters per second at 8 a.m. Tuesday, and supplied the drought-plagued Shandong Province, Tianjin Municipality and Hebei Province.The headquarters had released more water from reservoirs along the catchment to help with the irrigation of winter wheat crops, said the spokesman.The Chinese government on Friday announced plans to dig 1,350 wells in eight major wheat-growing provinces to help ease the drought that is threatening grain harvests.

LOS ANGELES, March 23 (Xinhua) -- People who are more physically active are less likely to have high blood pressure associated with a high-sodium diet, a new study suggests.The study was conducted by researchers at the Tulane University School of Public Health and Tropical Medicine in New Orleans, HealthDay News reported on Wednesday.Study findings were presented at the on-going American Heart Association's meeting on nutrition, physical activity and cardiovascular disease, held in Atlanta, said the report.To explore a potential association between exercise and the hypertensive role of dietary salt, the researchers focused on roughly 1,900 men and women (average age 38) living in a rural region in northern China. None took blood pressure medication during the study, according to the report.For one week all of the participants consumed 3,000 mg of sodium a day in their diet; for another week, they were placed on a high-sodium diet -- 18,000 mg per day.Nine blood pressure readings were taken each week, and questionnaires were completed to assess routine levels of physical activity, ranging from "very active" to "quite sedentary."When switching from the lower-sodium to a high-sodium diet, those who experienced a 5 percent or greater boost in their systolic blood pressure (the heart contraction measure represented by the top figure of a blood pressure reading) were deemed "high salt-sensitive."Those reporting the most physical activity had a 38 percent lower risk of being highly salt-sensitive than the least active group. This group was the least likely to see a 5 percent or greater rise in their blood pressure in response to a high-salt diet.Compared with the most sedentary group, those in the next-to- highest activity group had a 17 percent lower risk of salt- sensitivity, and those in the next-to-lowest activity group had a 10 percent lower risk.The team concluded that engaging in physical activity has a " significant," independent and progressively healthful impact on the degree to which salt sensitivity relates to blood pressure."For those with low physical activity, their blood pressure will increase more if they increase their sodium intake," study co- author Dr. Jiang He, chair of the department of epidemiology at the school, said in remarks published by HeathDay News."It's a little bit of a surprise," He added. "But this is the first study to look at this particular association between physical activity and salt sensitivity and blood pressure. But after thinking it over it makes sense, because we already know that physical activity will reduce blood pressure."High blood pressure, or hypertension, is a leading cause of stroke. Because of salt's association with high blood pressure, the American Heart Association recommends consuming less than 1, 500 mg of sodium per day.

NEW YORK, March 9 (Xinhua) -- The U.S. stocks dropped on Wednesday, the two-year anniversary of the beginning of a bull market, as concerns of oil prices and Middle East unrest continued to weigh on investors' minds.U.S. crude oil price dipped on Wednesday as crude inventories rose more than expected, though Brent crude rose on fears caused by continued violence in Libya.Meanwhile, Rex Tillerson, the CEO of energy giant Exxon Mobil Corp., said on Wednesday that he didn't think the recent jump in oil prices was hurting the U.S. economy just yet, but it's getting close.The market was worrying that the surging oil prices would hurt global economic recovery. Adding to those concerns, the Portuguese government's two-year cost of borrowing hit the highest level since it joined the eurozone in a bond auction on Wednesday.Wednesday marked the two-year anniversary of the beginning of a bull market. On March 9, 2009, the Dow Jones Industrial Average closed at 6,547 and the Standard & Poor's 500 Index closed at 677. The Dow is back above 12,000 now and the S&P 500 index has almost doubled.Meanwhile, the wholesale report was slightly positive, but still failed to boost the market. According to the U.S. Commerce Department, the wholesale inventories climbed 1.1 percent in January. Sales at the wholesale level rose 3.4 percent, the largest gain since November 2009.Economists expected that as businesses kept expanding, demands for products would continue to grow. And larger sales may also encourage businesses to keep restocking their shelves and boost factory production.According to the report, a 10.6-percent rise in demand for petroleum helped lift sales, reflecting higher oil and gas prices.While some investors were concerned that surging oil prices might have a negative impact on economy, some others believed the boost in sales and inventories in January hinted that the economy could withstand the impact.The Dow Jones industrial average lost 1.29 points, or 0.01 percent, to 12,213.09. The Standard & Poor's 500 Index was down 1. 80 points, or 0.14 percent, to 1,320.02. The Nasdaq declined 14.05 points, or 0.51 percent, to 2,751.72.

LONDON, March 15 (Xinhua) -- The moon would be in a "super position" on Saturday, which makes it a "supermoon" and the web is awash with myths about its implications such as connection to recent earthquakes, but that's not the case according to British experts.Technically the so-called "supermoon" means that the moon would be in its perigee, the closest point to earth in its orbit on March 19, and on top of that, it would also be a full moon at the same time.The massive earthquake in Japan just fueled the speculation that the gravitational pull of the "supermoon" will bring chaos to the Earth, such as earthquakes and volcanic activities.But "there is little that is special about perigee on March 19," said Dr. Robert Massey, deputy executive secretary of the Royal Astronomical Society. He said the moon will be around 360,000 km from the earth on that day, but this has happened at least 15 times during the last 400 years."There is no reason whatsoever to believe that there is a connection between the so-called 'supermoon' and the recent earthquake," Massey told Xinhua. "There are also no other 'abnormal' phenomena connected with a 'supermoon' other than the high tides that we experience twice every month."Massey was echoed by Dr. Bruce Malamud, a geophysicist in the Department of Geography at King's College London, who that: "A supermoon will not be able to actually influence at all the internal workings of our Planet Earth, as there is so much momentum and mass already stored up, that the actual effect is negligible.""The earthquake took place a full 8 days before the 'supermoon' meaning that the tidal forces exerted by the moon and sun together were near their minimum rather than maximum level, directly contradicting the fearmongers," said Massey.Calling the "supermoon" claims "bogus science," he questioned the motives of those who made such claims on the day that thousands of people died in a severe earthquake and the ensuing tsunami.

来源：资阳报