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1、鐵與運(yùn)動(dòng)的關(guān)系 Iron and the Effects of Exercise Para 1 Sports medicine experts have observed for years that endurance athletes, particularly females, frequently have iron deficiencies. Now a new study by a team of Purdue University researchers suggests that even moderate exercise may lead to reduced ir

2、on in the blood of women. 運(yùn)動(dòng)醫(yī)學(xué)專家經(jīng)過多年的觀察， 發(fā)現(xiàn)耐力運(yùn)動(dòng)員， 特別是女性，經(jīng)常會(huì)缺鐵。普渡大學(xué)研究 人員進(jìn)行的一項(xiàng)新的研究表明：即使是適度的鍛煉，也可能會(huì)降低女性血液中的鐵含量。 Para 2 “We found that women who were normally inactive and then started a program of moderate exercise showed evidence of iron loss, ”says Roseanne M. Lyle, associate professor at Purdue.

3、Her study of 62 formerly inactive women who began exercising three times a week for six months was published in the journal Medicine & Science in Sports & Exercise. “我們發(fā)現(xiàn)，那些通常不運(yùn)動(dòng)的女性一旦開始適度的鍛煉，就會(huì)出現(xiàn)鐵含量下降的跡象， ” 普渡大學(xué)羅斯安妮? M.萊爾副教授說。她對(duì)62名婦女進(jìn)行了研究，并將研究結(jié)果發(fā)表在 《體 育運(yùn)動(dòng)醫(yī)學(xué)與科學(xué)》雜志上。這些婦女原先不怎么運(yùn)動(dòng)，后來開始了為期 6 個(gè)月、每周 3 次的鍛

4、煉。 Para 3 “Women who consumed additional meat or took iron supplements were able to bounce back, ”she notes. “But the new exercisers who followed their normal diet showed a decrease in iron levels. ” 萊爾指出：“那些增食肉類食品或服用鐵質(zhì)補(bǔ)劑的女性能夠恢復(fù)到健康狀態(tài)。但突然參加鍛 煉卻仍沿用舊食譜的人則顯示出鐵含量降低。 ” Para 4 Iron deficiency is very c

5、ommon among women in general, affecting one in four female teenagers and one in five women aged 18 to 45, respectively. But the ratio is even greater among active women, affecting up to 80 percent of female endurance athletes. This means, Lyle says, that “too many women ignore the amount of iron th

6、ey take in ”. Women of childbearing age are at greatest risk, since their monthly bleeding is a major source of iron loss. Plus, many health-conscious women increase their risk by rejecting red meat, which contains the most easily absorbed form of iron. And because women often restrict their diet i

7、n an effort to control weight, they may not consume enough iron-rich food, and are liable to experience a deficiency. 缺鐵在女性中是很常見的，每四個(gè)十幾歲的少女中有一人缺鐵，每五個(gè) 18 至 45 歲的女性 中有一人缺鐵。 而在積極鍛煉的婦女中這一比例更高， 女耐力運(yùn)動(dòng)員中， 缺鐵者比例則高達(dá) 80% 。萊爾說，這意味著“太多女性忽視了自己攝入的鐵含量” 。育齡女性危險(xiǎn)最大，因?yàn)?月經(jīng)是鐵流失的重要原因之一。 此外， 許多保健意識(shí)太強(qiáng)的女性也很危險(xiǎn)， 因?yàn)樗齻兙芙^食 用牛肉或羊

8、肉， 而這些肉中含有的鐵最易被吸收。 而且，由于女性常常為了控制體重而節(jié)食， 從而未能攝取足夠的含鐵豐富的食物，結(jié)果可能導(dǎo)致缺鐵。 Para 5 “The average woman takes in only two thirds of the recommended daily allowance of iron, ”notes another expert. “For a woman who already has a poor iron status, any additional iron loss from exercise may be enough to tip her o

9、ver the edge into a more serious deficiency, ”notes the expert. 另一名專家指出， “普通女性每天攝入的鐵只是應(yīng)攝入量的三分之二。 ”他指出，“對(duì)于那些 已經(jīng)缺鐵的女性，任何因鍛煉而產(chǎn)生的更多鐵質(zhì)流失都足以導(dǎo)致體內(nèi)缺鐵狀況的惡化。 ” Para 6 Exercise can result in iron loss through a variety of the mechanisms. Some iron is lost in sweat, and, for unknown reasons, intense endurance

10、 exercise is sometimes associated with bleeding of the digestive system. Athletes in high-impact sports such as running may also lose iron through a phenomenon where small blood vessels in the feet leak blood. 運(yùn)動(dòng)可能通過多種機(jī)制導(dǎo)致鐵流失。 有些鐵隨汗液流失。 另外，由于某些未知的原因， 高強(qiáng) 度的耐力運(yùn)動(dòng)有時(shí)會(huì)引起消化系統(tǒng)內(nèi)出血。 運(yùn)動(dòng)員從事跑步之類高強(qiáng)度劇烈運(yùn)動(dòng)， 也可能會(huì) 因?yàn)樽?/p>

11、部血管失血的現(xiàn)象而使鐵質(zhì)流失。 Para 7 There are three stages of iron deficiency. The first and most common is having low iron reserves, a condition that typically has no symptoms. Fatigue and poor performance may begin to appear in the second stage of deficiency, when not enough iron is present to form the mole

12、cules of blood protein that transport oxygen to the working muscles. In the third and final stage, people often feel weak, tired, and out of breath -and exercise performa nee is severely compromised. 缺鐵分為三個(gè)階段： 第一也即最常見的階段， 是鐵質(zhì)儲(chǔ)量不足。這一階段一般沒有癥狀。到 了缺鐵的第二階段， 就會(huì)出現(xiàn)疲倦和力不從心， 此時(shí)體內(nèi)已沒有足夠的鐵來形成血蛋白分子， 將氧輸至運(yùn)動(dòng)

13、肌肉。在第三即最后階段，人常常感到虛弱、疲乏無力、喘不過氣，運(yùn)動(dòng)成績 大打折扣。 Pare 8 “People think that if they ?re not at the third stage, nothing is wrong, but that ?s not true, ”says John L. Beard, who helped design the Purdue study. “You?re not in stage 3 until your iron reserves go to zero, and if you wait until that point, you

14、?re in trouble. ” “人們認(rèn)為，只要不到第三階段就不會(huì)有什么問題。這種想法是不對(duì)的。 ”幫助設(shè)計(jì)普渡大 學(xué)研究的約翰? L.比爾德說?！爸挥挟?dāng)你的鐵儲(chǔ)量為零時(shí)，你才會(huì)進(jìn)入第三階段。而你若坐 等到這個(gè)時(shí)候，你的麻煩就大了。 ” ?t know they have a Pare 9 However , most people with low iron reserves don deficiency, because traditional methods of calculating the amount of iron in sufficient, Beard sta

15、tes. Instead, it blood (by checking levels of the blood protein that transports oxygen) are not ?s important to check levels of a different compound, which indicate the amount of storage of iron in the blood. While active, childbearing age women are most likely to have low iron stores, he notes,

16、 Men are not safe, especially if they don ?t eat meat and have a high level of physical activity. (An estimated 15 percent of male long distance runners have ?s advisable for people in these low iron stores.) Beard and other experts say it groups to have a yearly blood test to check bloo

17、d iron reserves. 然而， 比爾德指出， 大多數(shù)鐵質(zhì)儲(chǔ)量低的人并未意識(shí)到自己缺鐵， 因?yàn)閭鹘y(tǒng)的檢驗(yàn)血液中鐵 含量的方法——檢驗(yàn)血液中輸送洋氣的血蛋白的含量——是不夠的。 其實(shí)， 有必要檢查血液 中另一種混合成分的含量， 它可以顯示血液中的鐵含量。 他還指出， 雖然積極鍛煉的育齡婦 女最有可能鐵含量低， “但男性也并非不缺鐵，尤其是在他們不吃肉類而又從事高強(qiáng)度的體 力活動(dòng)的情況下。 ”(估計(jì)有 15% 的男性長跑運(yùn)動(dòng)員鐵含量低。 )比爾德和其他專家都說， 對(duì)這些人而言，最好每年驗(yàn)一次血，以測(cè)定血液中的鐵含量。 Pare 1o If iron levels are low, t

18、alk with a physician to see if the deficiency should be corrected by modifying your diet or by taking supplements. In general, it?s better to undo the problem by adding more iron-rich foods to the diet, because iron supplements can have serious shortcomings. Supplements may produce a feeling of want

19、ing to throw up, and may be poisonous in some cases. The best sources of iron, and the only sources of the form of iron most readily absorbed by the body, are meat, chicken, and fish. Good sources of other forms of iron include dates, beans, and some leafy green vegetables. 如果鐵含量低， 就要去看醫(yī)生， 以確定是否該通過調(diào)

20、整飲食或服用鐵質(zhì)補(bǔ)劑來校正不足。 般說來， 解決問題是最好方法是在食譜中增加含鐵豐富的食物， 因?yàn)殍F質(zhì)補(bǔ)劑可能存在嚴(yán)重 缺陷。 服用鐵質(zhì)補(bǔ)劑可能使人想嘔吐，有時(shí)甚至還會(huì)引起中毒。最好的鐵來源，以及唯一最 易為身體所吸收的鐵來源，是肉、雞和魚。 其他較好的鐵質(zhì)來源包括棗、 豆類和一些多葉綠 色蔬菜。 Pare 11 “Select breads and cereals with the words , iron-added ?on the label, ” writes sports diet expert Nancy Clark. “This added iron supplements

21、the small amount that naturally occurs in grains. Eat these foods with plentiful Vitamin C(for example, drink orange juice with cereal or put a tomato on a sandwich) to enhance the amount of iron absorbed. ”Clark also recommends cooking in iron pans, as food can derive iron from the pan during the

22、 cooking process. “The iron content of tomato sause cooked in an iron pot for three hours showed a striking increase, the level going up nearly 30 times, ”she writes. And people who are likely to have low iron should avoid drinking coffee or tea with meals, she says, since substances in these drin

23、ks can interfere with iron being absorbed into the body. “選擇那些標(biāo)有’加鐵’字樣的面包和麥片， ”運(yùn)動(dòng)營養(yǎng)專家南希?克拉克寫道， “這些增加 的鐵質(zhì)補(bǔ)充了谷物中自然含鐵量的不足。將這些食物與含有大量維生素 C 的食物一起食用 ——比如吃麥片時(shí)喝橘子汁，或在三明治內(nèi)夾上番茄——可以促鐵質(zhì)吸收。 ”克拉克還建議 用鐵鍋烹食，因?yàn)榕胝{(diào)過程中食物能從鐵鍋中吸收鐵質(zhì)。她寫道， “在鐵鍋內(nèi)烹煮了 3 個(gè)小 時(shí)的番茄汁，其含鐵量大大提高，增加到原來的 30 倍左右?！彼f，鐵含量可能低的人， 吃飯時(shí)應(yīng)避免喝咖啡或飲茶，因?yàn)檫@些飲料中所含的

24、物質(zhì)會(huì)妨礙身體對(duì)鐵質(zhì)的吸收。 Pare 12 “Active women need to be a lot more careful about their food choices, sums up Purdue ?s Lyle. “If you pay attention to warning signs before iron reserves are gone, you can remedy the deficiency before it really becomes a problem. ” “運(yùn)動(dòng)女性應(yīng)特別注意選擇飲食。 ”普渡大學(xué)的萊爾總結(jié)說： “如果你在鐵含量流失之前就注 意到了警告信號(hào)，你就可以在它真正成為問題之前彌補(bǔ)鐵質(zhì)的不足。 ” (Words: 907)