Didyouknowthatsixtypercentofyourbodyweightiswater?Howev...
问题详情:
Did you know that sixty per cent of your body weight is water? However,
a loss of only two per cent of this water throughdehydration(脱水) during exercise can significantly affect your performance. The more you sweat, the more your exerciseperformance declines, unless you drink enough to replace your lossof fluids.
When you lose too much water, you can overheat quite easily,especially in a warm this is not the only problemyou may face. Dehydration leads to your heart pumping muchfaster, which means exercise becomes more difficult and requiresmore effort. Despite these problems, however, many of us simplydo not take enough fluids in when we head for the gym or set outon a run.
So why is this? How do we manage to lose so much waterwithout simply drinking more toreplace it? Well, itˈs easier thanyou think. When we are at rest, we quickly become aware that weare thirsty and will put that right by having a drink. When weexercise, on the other hand, our thirstmechanism(结构) does notwork as effectively, so we donˈt notice early enough that we areactually thirsty. In fact, we only start to feel thirsty when we havealready lost around two per cent of our body weight.
Another problem is that, the more dehydrated we becomeduring exercise, the more difficult it is to prevent furtherdehydration—because our stomachs become intolerant to fluidsand we do not absorb water properly, just when we need it most.
The key thing about fluids and exercise is to manage yourintakeproperly
—regular small amounts are preferable, and someshould be drunk before the period of exercise begins. You alsoneed to match your intake to the sort of exercise you are doing. For example, for one hour of exercise, such as taking part in a 10 km run, you need to drink about two extra litres of water. For longer periods of exercise, sports drinks are recommended. 33. We know from the text that during exercise, dehydration _____. A. can be easily avoided
B. will lead to poor performance C. can cause many health problems
D. will be controlled whenever we drink again 34. Why do people suffer from dehydration easily during exercise? A. Their thirst mechanism stops working.B. Their focus is on the exercise. C. Their thirst response is slow.D. Their stomachs are full. 35. When exercising, you are advised to _____. A. have regular breaksB. drink water accordingly C. drink sports water in advanceD. have at least two litres of water
【回答】
BCB
知识点:阅读理解
题型:阅读理解
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问题详情:打秋千时,为使秋千越荡越高,人应有一个从直立到蹲下,又从蹲下到站直的过程.则打秋千时 A.人的机械能是守恒的 B.人应在最低点站起来 C.人应在最高点站起来 D.人在最低点时失重【回答】C知识点:未分类题型:选择题...
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予独爱莲之 , 。(周敦颐《爱莲说》)
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某商品进价是1000元,售价为1500元.为促销,商店决定降价出售,但保*利润率不低于,则商店最多降 元...
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某班抽取6名同学进行体育达标测试,成绩如下:80,90,75,80,75,80.下列关于对这组数据的描述错误的...
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