动一动，心脏更健康

蓝利霞

A study， published in the European Heart Journal， is the first to assess how different movement patterns throughout the 24-hour day are linked to heart health. In this study， the researchers analyzed data from six studies， including 15，246 people from five countries， to see how movement behavior across the day is associated with heart health. Each participant used a wearable device on their top part of a leg to measure their activity throughout the 24-hour day and had their heart health measured.

The researchers identified a ranking of behaviors that make up a typical 24-hour day， with time spent doing moderate-intense activity providing the most benefit to heart health， followed by light activity， standing and sleeping compared with the harmful impact of sitting behavior.

The team modelled what would happen if an individual changed various amounts of one behavior for another each day for a week to estimate the effect on heart health for each situation. When replacing sitting behavior， as little as five minutes of moderate-intense activity had a noticeable effect on heart health.

Dr Jo Blodgett， first author of the study， said： “The big idea from our research is that while small changes to how you move can have a positive effect on heart health， intensity of movement matters. The most beneficial change we observed was replacing sitting with moderate to intense activity. It could be a run， a quick walk， or stair climbing-basically any activity that augments your heart rate and makes you breathe faster， even for a minute or two.”

The researchers pointed out that although time spent doing intense activity was the quickest way to improve heart health， there are ways to benefit for people of all abilities — it’s just that the lower the intensity of the activity， the longer the time is required to start having a real benefit. Using a standing desk for a few hours a day instead of a sitting desk， for example， is not only a change over a relatively large amount of time ， but is also one that could be integrated into a working routine fairly easily as it does not require any time commitment.

（材料出自Science Daily網站，有删改）

1. Why does each participant wear a device on their leg？

A. To analyze heart data.

B. To measure their flexibility.

C. To measure their heart health.

D. To analyze movement patterns.

2. What activity poses the greatest harm to health？

A. Sitting. B. Running.

C. Standing. D. Sleeping.

3. What does the underlined word “augments” mean in Paragraph 4？

A. Harm.   B. Feature.

C. Increase.   D. Inspire.

4. What can be inferred from the last paragraph？

A. You can stand to finish your work.

B. You can sit on a good desk for a few hours.

C. The longer you’re involved in the activity， the better you are.

D. Intense activities should be integrated into a working routine.

1. C。解析：細节理解题。根据材料第一段第三句“Each participant used a wearable device on their top part of a leg to measure their activity throughout the 24-hour day and had their heart health measured”，我们可知参与者佩戴设备是为了测量心脏的健康状况。故选C。

2. A。解析：推理判断题。根据材料第二段的内容，我们可知坐着这一行为对身体最有害。故选A。

3. C。解析：细节理解题。根据画线词所在句子中的“makes you breathe faster”，我们可知这一句提到的活动是能够提高心率的，因而“augments”应有“提高，增加”之意。故选C。

4. A。解析：推理判断题。根据材料最后一段的最后一句“Using a standing desk for a few hours a day instead of a sitting desk， for example， is not only a change over a relatively large amount of time ， but is also one that could be integrated into a working routine fairly easily as it does not require any time commitment”，我们可知偶尔站着办公是很好的。故选A。