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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.

WUHAN, Feb. 8 (Xinhua) -- Ten people were comfirmed dead and nine others injured when a farmer's tricycle rolled over into an 8-meter deep gully at about 2:30 p.m. Monday at a village in Lichuan City, Hubei province.Eight passengers were found dead on the spot. The eleven wounded were hastened to the hospital. But two of them died on the way.Sources with the Lichuan government said the farmer's vehicle carried the passengers illegally. The rescue operation continued until midnight. The actual cause for accident was still under investigation.

BRASILIA, April 26 (Xinhua) -- A survey conducted by Brazil's Ministry of Health showed Tuesday that half of Brazilians aged over 55 have hypertension.According to the research, which has been carried out annually since 2006, the proportion of Brazilians diagnosed with hypertension increased over the past five years, from 21.6 percent in 2006 to 23.3 percent in 2010.Besides, the diagnosis of hypertension is higher among women (25.5 percent) than men (20.7 percent). But in both sexes, the older people are, the more common the disease becomes, the ministry reported.The ministry also said that, to address the problem, the Brazilian government distributes free medicines to control blood pressure, since 80 percent of Brazilians who suffer from hypertension depend on the public health system.The Ministry of Health signed on April 7 an agreement with the food industry, aiming to reduce salt in processed food.If hypertension is left untreated, some complications including clogged arteries, stroke and myocardial infarction will bring patients more troubles.

WELLINGTON, May 27 (Xinhua) -- Eating kiwifruit might be a much better way of getting vitamin C into your system than taking purified vitamin supplements, according to research from New Zealand.Researchers with the University of Otago found that in mice eating kiwifruit, vitamin C uptake was five times as effective as taking a purified supplement form.The study was published in the American Journal of Clinical Nutrition, the highest ranking journal for human nutrition research, said a statement from the university.Lead researcher Associate Professor Margreet Vissers said people required vitamin C (ascorbate) in all body tissues and organs to be healthy, but the only source of vitamin C was through food or in purified form, arguably the most commonly consumed vitamin supplement.In the experiment vitamin C-deficient mice were fed the vitamin over a month, either as kiwifruit or as an equivalent amount of pure vitamin C, said the statement.Mice fed the kiwifruit absorbed vitamin C much more efficiently than those given the purified supplement form, and they also retained it for longer, indicating something in the fruit improved absorption and retention."The findings of the mouse trial have important implications for human nutrition," said Vissers."The question that has often been asked is whether a supplement is as good a source of vitamin C as whole foods, but few studies have addressed this issue. We are uniquely placed to do that work. "An equivalent human study was underway to determine whether the situation also applied to people, said the statement.The mouse study was funded by the university and kiwifruit marketing firm Zespri.