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Another unit used to measure levels
另一个衡量运动强度的单位是MET
of activity is the MET. MET stands for
MET的意思是代谢当量任务
metabolic equivalent task. All living being
所有生物都需要能量
require energy to support the basic functions
来维持人体的基本机能
of the body hence there is a constant energy cost
所以这些代谢过程都要
associated with these metabolic processes.
持续不断地消耗能量
This is called the resting metabolic rate.
这叫做静息代谢率
Physical activity adds to the energy costs of
除了人体保持静止需要的能量
the body beyond those required to maintain
运动会消耗人体更多的能量
the body at rest. Energy expenditure varies
能量消耗随着运动种类
with type of activity and intensity and the MET
和剧烈程度的不同而变化
measures this. Many studies have been done
MET正是衡量能量消耗多少的单位
to determine energy cost of different activities
很多研究发现，通过检测氧气的消耗
by monitoring the oxygen consumed and
和计算运动的平均耗氧量
calculating the average oxygen it takes
可以确切得知不同运动的
to do that activity. Comparing that average oxygen
能量消耗是多少，通过比较
intake to resting oxygen uptake is how METs
平均耗氧量和静息耗氧量而得出的MET值
are determined. One MET is the energy expended
一个MET是静止时消耗的能量
at rest. Two METs designates the energy expended
两个MET指的是静止时
twice that at rest and so on. The higher the MET
消耗能量的2倍 MET值越高
the more intense the activity.
运动就越剧烈
The chart gives examples of activities
这个图标提供了各种运动
and their associated METs. Very light activities
和它们的MET值，非常轻微运动
such as standing, reading, talking on the telephone,
例如站立，阅读，打电话
studying, sitting in class and note taking all have
学习，坐在教室上课，记笔记等
a MET from 1.3 to 1.8. Light activities have
MET值在1.3到1.8之间
a MET of 2. Activities in this category
轻度运动的MET值是2
are playing a musical instrument, gardening,
轻微运动包括弹奏乐器，做园艺
light office work such as filing, walking
整理文件等轻度办公室工作
at a slow pace and light use of hand tools.
慢走，以及手动工具的少量使用
Moderately vigorous activities have
中度剧烈运动的MET值是
a MET of 3.5 to 4 and include such activities
3.4到4，包括举重
such as weight lifting, leisurely kayaking, walking
休闲皮艇运动，在办公室中行走
in an office and golfing without carrying the clubs.
不携带球棒打高尔夫球等
Vigorous activities have METS from 6 to 16
剧烈运动的MET值在6到16之间
and include things from slow jogging at
包括消耗6个MET值的
a 13 minute mile with a MET of 6
13分钟慢跑，和消耗16个MET值的
to running a 6 minute mile with a MET of 16.
6分钟慢跑
Physical activity and obesity are closely related.
运动和肥胖有着密切的关系
Individuals who are inactive tend
不爱运动的人
to have a higher percent body fat
肥胖的概率更高
and may be obese. Obesity has been found
可能导致过度肥胖，研究发现
to be a significant risk factor for cancer.
肥胖是癌症的重要诱因
The American Cancer Society estimated
2005年，美国癌症研究协会估测
in 2005 that 90,000 Americans die annually
每年有90000美国人
from cancer primarily because of being overweight.
因为过度肥胖而死于癌症
This accounted for 14% of cancer in men
上述人群占男性癌症患者的14%
and 20% of cancer in women. In women
占女性癌症患者的20%
obesity leads to higher risks of breast, uterine,
女性过度肥胖容易导致乳腺癌，子宫癌
cervical, pancreatic, esophageal, renal and
子宫颈癌，胰腺癌，食道癌，肾癌
gall bladder cancers. And in men obesity
以及胆囊癌的高发病率，男性过度肥胖
is linked to higher risk for liver, pancreatic,
会带来肝癌，胰腺癌，结肠癌
colorectal, stomach and gall bladder cancers.
胃癌以及胆囊癌的高发病率
