Critical Periods of Exercise
Early childhood (~3-7 years of age) is an important window for determining body composition trajectory and may be a critical period for the development of tissue partitioning patterns that influence obesity risk. As adiposity accelerates during this critical period, deposition/ preservation of fat stores may be sustained at the 'expense' of other tissues; i.e. energy homeostasis may be inherently biased toward fat gain. The type and amount of tissue mass accrued in early childhood has implications for metabolic profile, glucose/insulin homeostasis, hormone profile and resting energy expenditure.
The interplay between fat and bone deposition represents a physiologic trait enabling the body to choose between shuttling 'energy' towards accrual of a particular tissue. Plausibly the phenotype underlying obesity and diabetes risk may be determined by the differentiation of cell type (adipocyte, osteocyte, etc.) during this early stage of growth and development. In vitro studies demonstrate transdifferentiation under the influence of specific external stimuli, which can switch phenotypes toward other cell lineages. Further, rodent models have demonstrated that exposure to stimuli (exercise) early in life may prevent excess fat mass accrual in adulthood, even when the stimulus is later removed (animals are no longer exercising). Children's early experiences (engagement in physical activity vs. sedentary behavior) may 'environmentally induce' alterations in body composition and predispose individuals to obesity throughout life.
Aim 1. To examine the associations between body composition via DXA and objectively-measured physical activity/inactivity.
- Hypothesis 1.1: There is a positive association between physical activity and bone mass.
Hypothesis 1.2: There is a positive association between sedentary behavior and total fat mass.
Aim2. To examine the associations between adipose tissue distribution via MRI and objectively-measured physical activity/inactivity.
- Hypothesis 2.1: There is an inverse association between physical activity and bone marrow adipose tissue.
- Hypothesis 2.2: There is a positive association between sedentary behavior and bone marrow adipose tissue.
調査の概要
研究の種類
入学 (実際)
段階
- 適用できない
連絡先と場所
研究場所
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Alabama
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Birmingham、Alabama、アメリカ、35294
- University of Alabama at Birmingham
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Birmingham、Alabama、アメリカ、35210
- Family Care Center
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参加基準
適格基準
就学可能な年齢
健康ボランティアの受け入れ
受講資格のある性別
説明
Inclusion Criteria:
- children aged 3 to 7 years
- healthy, not under the care of a doctor
- not taking medications known to alter body composition or metabolism
研究計画
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:防止
- 割り当て:非ランダム化
- 介入モデル:並列代入
- マスキング:なし(オープンラベル)
武器と介入
参加者グループ / アーム |
介入・治療 |
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実験的:Exercise group
Children will participate in a 10-week moderate to vigorous exercise program
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Children will be exposed to a 10-week exercise intervention
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介入なし:non-exercising
Participants will receive no intervention
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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 |
時間枠 |
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Association between exercise and bone marrow adipose tissue in children 3-7 years
時間枠:10 weeks of exercise
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10 weeks of exercise
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協力者と研究者
研究記録日
主要日程の研究
研究開始
一次修了 (実際)
研究の完了 (実際)
試験登録日
最初に提出
QC基準を満たした最初の提出物
最初の投稿 (見積もり)
学習記録の更新
投稿された最後の更新 (実際)
QC基準を満たした最後の更新が送信されました
最終確認日
詳しくは
本研究に関する用語
キーワード
- エクササイズ
- 骨密度
- bone marrow adipose tissue
- Children in the intervention condition will complete a supervised physical activity program 3 days/wk for 10 weeks
- Control treatment will be provided no intervention
- All participants will be instructed not to change their current dietary habits during the study period.
その他の研究ID番号
- F090904001
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。
Exerciseの臨床試験
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University of Erlangen-Nürnberg Medical SchoolKlinikum Nürnberg完了
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Shanghai Jiao Tong University School of Medicine積極的、募集していない
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University of TorontoUniversity Health Network, Toronto; University of Western Ontario, Canada; Institute for Clinical... と他の協力者完了