Effect of Nutrition on Bone Metabolism as Assessed by 41Ca
2013年7月26日 更新者：Henk FJ Hendriks、TNO
The Effect of Nutritional Intervention on Bone Metabolism as Assessed by 41Ca and Modeling; Proof of Concept
The present study aims to develop a technique based on a single dose of a calcium isotope, which enables to determine the effect of a nutritional intervention on bone calcium metabolism.
For this purpose nutritional interventions with calcium, vitamin D and vitamin K will be applied in postmenopausal women.
Treatment effects will be determined by the urinary excretion of the calcium isotope and related to classical bone markers.
調査の概要
詳細な説明
In the present proposal a method is described that may enable studying the effect of nutrition on bone calcium turnover far more accurate, within a shorter time frame and therefore less intensive for the volunteers in clinical studies as compared to presently existing methods.
This method will enable screening for promising food concepts for combating osteoporosis within a relatively short time.
Recent developments show that use of the nuclide 41Calcium (41Ca) and measurement by accelerator mass spectrometry (AMS) has great potential in measuring effects on bone level within a relatively short period of time.
When introducing a diet change (intervention) the bone metabolism of calcium may change resulting in a changed 41Ca-signal in the urine.
So far a few medication studies with osteoporotic volunteers have been performed and it appears that this ultrahigh sensitive technique may also be applicable for nutrition studies in healthy volunteers.
研究の種類
介入
入学 (実際)
12
段階
- 適用できない
参加基準
研究者は、適格基準と呼ばれる特定の説明に適合する人を探します。これらの基準のいくつかの例は、人の一般的な健康状態または以前の治療です。
適格基準
就学可能な年齢
50年～68年 (大人、高齢者)
健康ボランティアの受け入れ
はい
受講資格のある性別
女性
説明
Inclusion Criteria:
Healthy as assessed by the
- health and lifestyle questionnaire,
- physical examination
- results of the pre-study laboratory tests
- Females aged 50-68 years at Day 01 of the study
- Relatively low calcium intake as assessed by dairy intake questionnaire
- Body Mass Index (BMI) < 30 kg/m2
- Postmenopausal as confirmed by Follicle stimulating hormone (FSH) and oestradiol (E2) blood levels (FSH > 40IU/L, E2 < 70 pg/mL)
- Normal Dutch eating habits
- Voluntary participation
- Having given written informed consent
- Willing to comply with the study procedures
- Appropriate veins for blood sampling/cannula insertion according to TNO
- Willing to accept use of all nameless data, including publication, and the confidential use and storage of all data for at least 15 years
- Willing to accept the disclosure of the financial benefit of participation in the study to the authorities concerned.
Exclusion Criteria:
- Participation in any clinical trial including blood sampling and/or administration of substances up to 90 days before Day 01 of this study
- Participation in any non-invasive clinical trial up to 30 days before Day 01 of this study, including no blood sampling and/or oral, intravenous, inhalatory administration of substances
- Having a history of medical or surgical events that may significantly affect the study outcome, including cardiovascular disease or hypertension and gastrointestinal disease
- Prescribed medication, including hormone replacement therapy (within 6 months before start of the study) and anticoagulant medication.
- Reported intolerance for dairy products
- Not willing to stop the use of Boerenkarnemelk and cheese of the following Dutch brands: Emmenthaler, Gruyere, Leer/Maasdammer
- Alcohol consumption > 21 units/week
- Not willing to stop use of supplements containing minerals or vitamins
- Reported unexplained weight loss or gain of > 2 kg in the month prior to the pre-study screening
- Reported slimming or medically prescribed diet
- Reported vegan, vegetarian or macrobiotic
- Recent blood donation (<1 month prior to the start of the study)
- Not willing to give up blood donation during the study.
- Personnel of TNO Quality of Life, their partner and their first and second degree relatives
- Not having a general practitioner
- Not willing to accept information-transfer concerning participation in the study, or information regarding her health, like laboratory results, findings at anamnesis or physical examination and eventual adverse events to and from her general practitioner.
研究計画
このセクションでは、研究がどのように設計され、研究が何を測定しているかなど、研究計画の詳細を提供します。
研究はどのように設計されていますか？
デザインの詳細
- 主な目的：基礎科学
- 割り当て：ランダム化
- 介入モデル：クロスオーバー割り当て
- マスキング：4倍
武器と介入
参加者グループ / アーム |
介入・治療 |
|---|---|
|
アクティブコンパレータ：calcium supplement with vitamin K
Milk product supplying about 420 mg Ca and 7.5 μg vitamin D3 and 100 μg vitamin K.
Additional 200 mg calcium in the form of carbonate
|
A calcium product will be given either with or without vitamin K.
Each intervention will last for 5 weeks, each followed by a 5 week wash-out.
The first intervention will start about 4 months after inclusion and the single 41Ca bolus.
|
|
プラセボコンパレーター：calcium supplement without vitamin K
Milk product supplying about 420 mg Ca and 7.5 μg vitamin D3. no vitamin K.
Additional 200 mg calcium in the form of carbonate
|
この研究は何を測定していますか？
主要な結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
|
urinary 41calcium excretion
時間枠：on study day numbers: 36, 71, 106, 113, 120, 127, 134, 141, 148, 155, 162, 169, 176, 183, 190, 197, 204, 211, 218, 225, 232, 239, 246, 253, 260, 267, 274, 281, 288
|
Urine is collected for measurement of 41Ca.
The concentration change of 41Ca during the intervention period indicates the efficacy of the intervention.
|
on study day numbers: 36, 71, 106, 113, 120, 127, 134, 141, 148, 155, 162, 169, 176, 183, 190, 197, 204, 211, 218, 225, 232, 239, 246, 253, 260, 267, 274, 281, 288
|
二次結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
|
commonly accepted biomarkers for bone metabolism
時間枠：on study day numbers: 148, 183, 218, 253, 288
|
Plasma osteocalcin and urinary deoxypyridinolin/creatinin ratio are measured as traditional markers for bone accretion and bone resorption respectively.
These are the most commonly used biomarkers for bone metabolism.
|
on study day numbers: 148, 183, 218, 253, 288
|
協力者と研究者
ここでは、この調査に関係する人々や組織を見つけることができます。
スポンサー
捜査官
- 主任研究者：Gertruud C Bakker, PhD、TNO
研究記録日
これらの日付は、ClinicalTrials.gov への研究記録と要約結果の提出の進捗状況を追跡します。研究記録と報告された結果は、国立医学図書館 (NLM) によって審査され、公開 Web サイトに掲載される前に、特定の品質管理基準を満たしていることが確認されます。
主要日程の研究
研究開始
2008年11月1日
一次修了 (実際)
2009年8月1日
研究の完了 (実際)
2009年8月1日
試験登録日
最初に提出
2010年4月9日
QC基準を満たした最初の提出物
2013年7月26日
最初の投稿 (見積もり)
2013年7月29日
学習記録の更新
投稿された最後の更新 (見積もり)
2013年7月29日
QC基準を満たした最後の更新が送信されました
2013年7月26日
最終確認日
2013年7月1日
詳しくは
この情報は、Web サイト clinicaltrials.gov から変更なしで直接取得したものです。研究の詳細を変更、削除、または更新するリクエストがある場合は、register@clinicaltrials.gov。 までご連絡ください。 clinicaltrials.gov に変更が加えられるとすぐに、ウェブサイトでも自動的に更新されます。