US Changes Definition for High Blood Pressure
From VOA Learning English, this is the Health & Lifestyle report.
Recently, two leading heart organizations changed the definition of what it means to have high blood pressure. Because of this change, the number of Americans with high blood pressure jumped from 32 percent to 46 percent.
Doctors at the American Heart Association and the American College of Cardiology now classify anyone with a blood pressure reading of 130 over 80 as having high blood pressure.
Before, the cutoffs for high blood pressure had been a top number of 140 and a lower number of 90.
Health experts at the website Science Daily say blood pressure is defined by two numbers. The top number, called systolic, represents the force with which your heart pumps blood into the blood vessels. The bottom, called diastolic, is a measure of the resistance to the blood flow in the body's blood vessels.
The American Heart Association says the new guidelines are designed to help people take steps to control their blood pressure earlier. High blood pressure can cause heart disease and stroke – the two leading causes of death in the world.
The new guidelines set blood pressures in these categories:
Normal Blood Pressure: Under 120 over 80
Elevated Blood Pressure: Top number 120-129 and bottom number less than 80
High blood pressure around the world
A 2016 study by the World Health Organization and hundreds of scientists found that the number of people in the world with high blood pressure had reached 1.13 billion.
However, the study defined high blood pressure as 140 over 90. Should they adopt the new guidelines, the number of people with high blood pressure worldwide will most likely increase.
Scientists at Imperial College London led the study and looked at blood pressure measurements from nearly 20 million people from the years 1975 to 2015.
In this study, they found that the number of people with high blood pressure nearly doubled in 40 years.
Researchers found that over half of the world's adults with high blood pressure lived in Asia. Around 226 million people in China have high blood pressure, along with 200 million in India.
This study also found that in 2015 people in South Korea, the USA and Canada had the lowest high blood pressure rates in the world. With the new U.S. guidelines, the U.S. ranking in the world could change.
The researchers from Imperial College London published their findings from the study in the January 2017 edition of the medical journal The Lancet.
Does this mean more medication is necessary?
Health experts are warning people to not rush to medication to lower their high blood pressure. They advise that there are many lifestyle changes a person can make to effectively keep their blood pressure at a healthy level.
Regular exercise and losing weight can lower your blood pressure. In some people, making changes in diet can make a big difference. Eating more fruits, vegetables, fish, beans, nuts and seeds can help. Eating less sodium and drinking less alcohol can also help.
And that's the Health & Lifestyle report.
I'm Anna Matteo.
1.high blood pressure 高血压
Prime Minister Pavlov had been taken ill with high blood pressure.
2.around the world 世界范围内
There were television crews and pressmen from all around the world.
3.blood flow 血流量
Massage may help to increase blood flow to specific areas of the body.
4.heart disease 心脏病
A hundred years ago coronary heart disease was virtually unknown in Europe and America.
5.In some people, making changes in diet can make a big difference.
make a big difference 有意义；产生影响
It doesn't take a lot our time and money to make a big difference.
Whether he comes or not will not make a big difference.
6.The American Heart Association says the new guidelines are designed to help people take steps to control their blood pressure earlier.
take steps to 采取措施
She is not content with her present lot and wishes to take steps to improve it.
The directors will take steps to insure against possible failure.
近日，两家大型心脏病组织修改了高血压的定义 。美国高血压患者地比例因此从32%升至46% 。
《科学日报》网站的专家指出，血压由两个数字来定义 。高压（收缩压）是指心脏将血液泵入血管的力量 。而低压（舒张压）是人体血管中血流阻力的测量方法 。
美国心脏协会表示，新标准是为了帮助人们早些采取措施控制血压 。高血压会引发心脏病和中风——这是当今人类两大主要死亡原因 。
然而，该研究将高血压的标准定为高压140，低压90 。如果他们采纳新标准，那么全球的高血压患者人数很可能会增加 。
研究人员发现，全球超半数的成年高血压患者生活在亚洲 。中国约有2.26亿人患有高血压，而印度有2亿人 。
该研究还发现，2015年，全球居民患高血压比例最低的为韩国、美国和加拿大 。不过根据新标准，美国的排名可能会出现变数 。
健康专家警告称，不要急于服用降压药来降低血压 。他们建议，高血压患者可以调整生活方式，有效地将血压指数维持在相对健康的水平 。
经常锻炼、减肥可以有效降低血压 。有些人证明，改善饮食有很大的影响 。多吃水果、蔬菜、鱼、豆类、坚果和瓜子对身体十分有益 。另外，低盐、少酒也会起到一定作用 。