额外的维生素D补充能预防老年人跌倒

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http://news.yahoo.com/s/nm/20070 ... oKg1BNnUiX4t2MQ.3QA
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" u- |: g- T; x# A& b! v* ~Extra vitamin D reduces falls by elderly
Wed Feb 28, 12:25 PM ET

" y+ Y+ S- ?) m$ qNEW YORK (Reuters Health) - Getting plenty of vitamin D can help prevent falls among people living in nursing homes, a new study confirms.
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Among 124 nursing home residents, those who were taking 800 units of vitamin D daily were 72 percent less likely to fall over a five-month period than those on an inactive 'placebo' supplement, Kerry E. Broe and colleagues report in the Journal of the American Geriatrics Society.
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1 r; M" ^: k5 sOn the other hand, the men and women on lower vitamin D doses had the same risk of falling as those on placebo. "It's not just vitamin D, but it's adequate D," Broe told Reuters Health.

* J& N. e) x& e! V9 R+ EVitamin D deficiency is common among nursing home residents, and several studies have found supplementation with the vitamin -- which can strengthen muscle as well as promote bone strength by helping the body use calcium -- can reduce falling risk. However, other studies have found no link between taking vitamin D and the risk of falls or fractures.
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- V' S* c$ X! o3 F5 _1 B  h7 iMoreover, the appropriate level of supplementation, as well as the optimum blood level of vitamin D, remains a matter of debate.

To investigate, Broe, at the Institute for Aging Research at Hebrew SeniorLife in Boston, and her team re-analyzed the results of a previous study in which nursing home residents were given several different doses of vitamin D or placebo to check the effect on their blood levels of the vitamin.
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$ H& h/ e& ^* }- s* A$ ^0 eThe rate of falling during the five-month long study was the same, statistically, among those on placebo and those on 200, 400 or 600 IU of vitamin D daily, ranging from 44 to 60 percent, the researchers found. However, among participants taking 800 IU a day, the incidence of falls was lower at 20 percent.
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& D$ U# ]! p( {4 s) r/ Z; B/ h. oMany of the patients were also taking a multi-vitamin, Broe pointed out, so those in the highest intake group were actually getting 800 to 1,200 IU of vitamin D daily. Among those taking just 400 IU of vitamin D, the researchers found, half were deficient in the nutrient.
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: K; }5 Z6 K, z/ p5 A! h. X"There are many reasons why people fall," Broe noted. "Adequate vitamin D intake is one of many things that may prevent falling."
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- a$ L% e* Y  }7 f0 \+ R* CSOURCE: Journal of the American Geriatrics Society, February 2007.

额外的维生素D补充能预防老年人跌倒

, |! G+ a. |+ T. P纽约路透社2月28日报道――一项新的研究证实，足够的维生素D摄入有助于预防老年人跌倒。
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. N  @1 `) E# f" _1 z; k: L在124所疗养院的居住者中，每日摄入800单位维生素D组在5个月中的跌倒的患者与无效安慰剂摄入对照组相比少70％。而无论男女摄入较低剂量维生素D均与安慰剂对照组一样，具有相同的跌倒风险。
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维生素D缺乏在疗养院居住者中普遍存在，几项研究表明补充维生素能减少跌倒的风险，补充维生素在强壮肌肉的同时提高骨强度。也有研究表明在维生素D摄入与摔倒或骨折的风险之间无关。
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此外，适当的补给剂量以及最适维生素D血液浓度至今还存在争议。
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在波士顿的Hebrew SeniorLife衰老研究所，Broe带领其研究小组通过反复分析前期的研究结果（即给养老院的居住者以不同剂量的维生素D或安慰剂）检测维生素摄入对血中维生素浓度的影响。经过统计分析，在为期5个月的研究中，安慰剂组与每日摄入200、400或600单位维生素D组的摔倒率相同。然而，每日摄入800单位维生素D组的跌倒率降低了20％。

Broe指出，多数患者同时也摄入多种维生素，所以最高剂量摄入组实际每日维生素D摄入量为800～1200单位。那些只摄入400单位维生素D的患者中一半存在营养不足。
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Broe指出：“虽然跌倒的原因很多，但足量维生素D的摄入是预防跌倒的方法之一。”