Study to Observe the Capability to Absorb Calcium as an Measure of Adequate Levels of Vitamin D
Calcium Absorption Efficiency As An Indicator For Vitamin D Sufficiency
研究概览
详细说明
The specific aims of this project are:
- To determine the level of 25OHD that maximizes calcium absorption efficiency.
- To describe the dose response curve of calcium absorption to vitamin D intake and serum 25OHD.
This will be a randomized, double-blind, placebo-controlled trial of healthy postmenopausal females to determine the individual and combined effects of calcium and vitamin D supplementation.70 female participants, ages 50 to 70 years of age who are menopausal for over 1 year will be recruited into the study . The patients participation in this study will last about 10 weeks. Approximately 70 subjects from Winthrop University Hospital and the surrounding area will participate in this study. There is a total of 3 visits. Patients will be fasting for all visits. The first visit is a screening visit to determine if the patients qualify.
At visit 2, the patients will be given a light breakfast and asked to drink an 8 ounce glass of milk or calcium fortified orange juice containing a calcium isotope. After breakfast, the doctor or nurse will start an intravenous infusion and inject the patient with an IV solution containing a calcium isotope. This is a stable calcium isotope that is not radioactive and has no known toxicity. The patients will also be asked to collect a 24 hour urine and return it to us the next day.
The volunteers will be divided into four groups:
The first group will take 800 iu daily of vitamin D supplementation. The second group will take 2000 iu daily of vitamin D.The third group will take 4000 iu vitamin D and the fourth group will only take placebos. Visit 3 is essentially the same as visit 2, with subjects returning unused study medication and given new tablets
Food frequency questionnaires will be filled out at the initial visit and final visit. Diet will be assessed using 3-day diet history form and NutritionPro analysis software. Patients will be asked to refrain from taking other vitamin D supplements and to continue their usual calcium intake.
研究类型
注册 (实际的)
阶段
- 不适用
联系人和位置
学习地点
-
-
New York
-
Mineola、New York、美国、11501
- Winthrop University Hospital
-
-
参与标准
资格标准
适合学习的年龄
接受健康志愿者
有资格学习的性别
描述
Inclusion Criteria:
Post menopausal women between the ages 50-70 yrs.
Exclusion Criteria:
- Any chronic medical illness including diabetes mellitus, history of myocardial infarction, or heart failure, malignancy, uncontrolled hypertension, history of anemia, leukemia, or other hematologic abnormalities, lupus, rheumatoid arthritis, or other rheumatologic disease, or kidney disease of any kind as determined by history and physical examination.
- Subjects with a BMI >35kg/m2
- Use of medication that influences vitamin D and bone metabolism (i.e. anticonvulsant medications, glucocorticoids, HAART [AIDS treatment], antirejection medications, high dose diuretics etc).
- Significant deviation from normal either in history, physical examination, or laboratory tests as evaluated by the primary investigator.
- Patients with a history of hypercalciuria ( Urine calcium:creatinine ratio > 0.37 , hypercalcemia ( serum calcium >10.21, nephrolithiasis, and active sarcoidosis will also be excluded.
- Unexplained weight loss >15% during the previous year or history of anorexia nervosa
- Participation in another investigational trial in the past 30 days prior to the screening evaluation.
- Patients reporting alcohol intake greater than 2 drinks daily.
- Subjects with baseline 25-OHD level greater than 70 nmol /L will be excluded.
- Smokers greater than one pack per day will be excluded
- Dietary calcium intake greater than 2000 mg will be excluded
- Participants who have history of allergy to milk, gluten or orange juice will be excluded
- Participants willing not to forego multivitamins and vitamin D supplements during the study -
学习计划
研究是如何设计的？
设计细节
- 主要用途：诊断
- 分配：随机化
- 介入模型：单组作业
- 屏蔽：双倍的
武器和干预
参与者组/臂 |
干预/治疗 |
|---|---|
|
实验性的：Post Menopausal
post menopausal women between the ages 50-70 yrs.
|
Dual isotope technique using stable isotopes
其他名称：
|
研究衡量的是什么？
主要结果指标
结果测量 |
大体时间 |
|---|---|
|
To determine the level of 25OHD that maximizes calcium absorption efficiency.
大体时间：3 months
|
3 months
|
次要结果测量
结果测量 |
大体时间 |
|---|---|
|
To describe the dose response curve of calcium absorption to vitamin D intake and serum 25OHD
大体时间：3 months
|
3 months
|
合作者和调查者
调查人员
- 首席研究员：John F Aloia, MD、Winthrop University Hospital
出版物和有用的链接
研究记录日期
研究主要日期
学习开始
初级完成 (实际的)
研究完成 (实际的)
研究注册日期
首次提交
首先提交符合 QC 标准的
首次发布 (估计)
研究记录更新
最后更新发布 (估计)
上次提交的符合 QC 标准的更新
最后验证
更多信息
与本研究相关的术语
其他研究编号
- 10003
此信息直接从 clinicaltrials.gov 网站检索，没有任何更改。如果您有任何更改、删除或更新研究详细信息的请求，请联系 register@clinicaltrials.gov. clinicaltrials.gov 上实施更改，我们的网站上也会自动更新.
维生素 D 缺乏症的临床试验
-
University of UlsterNorthern Ireland Executive; HSC Public Health Agency完全的
-
University of UlsterDairy Council for Northern Ireland; Agri-food & Biosciences Institute; Center for Nutrition and...完全的
-
University of Eastern Finland完全的
-
University of Eastern FinlandDSM Nutritional Products, Inc.完全的
-
Meir Medical Center完全的开发从数字立体光盘图像测量 C/D 比的新技术 | C/D 测量的观察者内再现性 | C/D 测量的观察者间变异性
Dual isotope technique的临床试验
-
Zimmer Biomet邀请报名关节疾病 | 类风湿关节炎 | 缺血性坏死 | 股骨颈骨折 | 髋骨关节炎 | 脱臼，髋关节 | 转子骨折 | 修复手术比利时, 美国, 大韩民国, 意大利
-
Stryker Trauma GmbH完全的股骨头坏死 | 原发性骨关节炎 | 先天性脱臼 | 股骨颈骨折 | 髋关节创伤后骨关节炎