귀트영 20101130 뉴스 스크립트

Fit heart can slow brain ageing

Keeping your heart fit and strong can slow down the ageing of your brain, US researchers say.
A Boston University team found healthy people with sluggish hearts that pumped out less blood had "older" brains on scans than others.
The team studied 1,500 people to observe how the brain shrinks as it ages.
A poor cardiac output aged the brain by nearly two years on average.
The link was seen in younger people in their 30s who did not have heart disease, as well as elderly people who did.
Lead researcher Dr Angela Jefferson said: "These participants are not sick people. A very small number have heart disease. The observation that nearly a third of the entire sample has low cardiac index and that lower cardiac index is related to smaller brain volume is concerning and requires further study."
The participants with smaller brain volumes on magnetic resonance imaging did not show obvious clinical signs of reduced brain function.
But the researchers say the shrinkage may be an early sign that something is wrong.
More severe shrinkage or atrophy occurs with dementia.
Dr Jefferson said there were several theories for why reduced cardiac index - how much blood the heart pumps out relative to body size - might affect brain health.
For example, a lower volume of blood pumping from the heart might reduce flow to the brain, providing less oxygen and fewer nutrients needed for brain cells.

[ 원문 : http://www.bbc.co.uk/news/health-10839021 ]

Words and sentence on air
* sluggish : lacking energy. 에너지가 없는 상태. 느릿느릿한 상태. 움직임이 둔한.
   slug : 달팽이와 비슷한 것. 껍질이 없는 것.
   sluggish economy : 부진한 경제 상태. 불경기.
* shrink : contract. 줄어들다.
   shrink : 정신과의사
* cardiac output : 심박출량. 심장이 내 보내는 혈액의 양.
   cardiac : 심장과 관련있는.
   cardiac disease : 심장병
* cardiac index : 심박출량을 나타내는 지수.
* magnetic resonance imaging : MRI. 자기공명영상
* shrinkage : getting smaller. 수축. the result of the shrink
* atrophy : 혈액부족으로 인한 신체부족.

* ageing : 노화
* sluggish heart : 심장이 느리게 뛰는.
* dementia : 치매