停止锻炼导致内脏脂肪堆积
Belly Fat Booms When Activity StopsActive? Better Stay That Way to Keep Hidden Belly Fat at Bay, Study Shows
By Miranda Hitti
WebMD Medical NewsReviewed by Louise Chang, MDMarch 18, 2008 -- Belly fat doesn't waste any time in gathering, given the chance. And a few weeks of inactivity may be all the chance it takes.
So say researchers including Rasmus Olsen, MD, of Denmark's Centre of Inflammation and Metabolism. They studied 10 healthy young men who were active, but not avid exercisers.
When the study started, the men walked 6,000 to 10,000 steps daily. But they didn't work out for more than two hours per week.
For the study, the men backed their activity way down, logging only 1,500 steps per day for two weeks. They got body scans to track their overall fat and their belly fat before and after their sedentary spell.
Overall, the men didn't gain any obvious fat. But their belly fat, located deep inside the abdomen, rose by 7% during the study.
Belly fat has been linked to increased risk of heart disease and diabetes. And previous research has shown that exercise cuts belly fat, which is also called visceral fat.
Belly fat isn't the only risky trend that started soon after activity stopped.
After three weeks of reduced activity, eight healthy young men became less sensitive to insulin, a hormone that controls blood sugar.
And those men's ability to handle fatty food also faltered.
The men ate a fatty meal before and after three weeks of reduced activity. They provided blood samples right after that meal so that their triglycerides, a type of blood fat, could be measured.
Triglyceride levels soared higher after the fatty meal when the men were idle, compared to in their active heyday.
The findings appear in a letter published in The Journal of the American Medical Association's March 19 edition.
As far as those findings show, the men were still healthy after their bout of inactivity. And it's not clear if their eating habits changed while they were inactive. But their history of activity wasn't a hedge against the risks of being sedentary.
The bottom line: If you become inactive, the body won't let you coast for very long, though those shifts may not be noticeable at first.
运动？研究表明，最好采用让隐藏的腹部脂肪无所遁形的方式
腹部脂肪一有机会马上就会存积。几周不运动就会有脂肪累积了。
丹麦炎症和代谢中心的医学博士Rasmus Olsen等研究人员得到这一发现。研究对象是10位健康青年男士，有一定活动但不是健身爱好者。
研究开始时，这些男士每天约走6000至10000步。但每周运动不会2小时。
研究中，这些人降低了活动量，两周内每天仅步行1500步。在这个低运动量前后，做身体扫描跟踪全身脂肪和腹部脂肪含量。
总的看来，脂肪量没有明显增加。但腹部脂肪，位于腹部深处，在研究过程中增加了7%。
腹部脂肪会增加人患心脏病和糖尿病的风险。以前的研究也表明锻炼可以减少腹部脂肪，也就是内脏脂肪。
活动停止后，腹部脂肪不是唯一迅速增加的风险。
降低活动量三周后，8位健康青年男士对控制血糖的激素-胰岛素的敏感度下降。
而且对脂肪类食物的消化能力也下降了。
在为期三周的低活动量的前后，进食脂肪食物，进食后马上检测血样，可以了解甘油三酯-一种血脂成分的含量。
相对于活动时期，他们在低运动时期进食脂肪食物后甘油三酯水平会升高很多。
该发现会刊登在美国医学协会杂志的3月19号的快报上。
迄今为止，研究表明，在一个低运动量周期后，他们还是健康的。还不清楚在活动降低后，他们的饮食习惯是否改变。但他们的运动经历并不能减少久坐不动带来的风险。
简而言之，如果你不爱活动了，身体不会让你轻松太久，虽然这些转变一开始并不容易发现。
停止锻炼如果饮食也相应降低，可以减轻肥胖。详细讨论见如下帖子
饮食方式与体育定位
http://www.tiyuol.com/thread-4701-1-1.html
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