Effects of Impaired Sleep on Energy Balance (SLOPUS)
Effects of Impaired Sleep on Energy Balance: A Randomized, 2-Condition, Crossover Study in Adolescents
The main aim of this study is to examine the effects of restricted sleep on energy and substrate metabolism as well as relevant hormonal systems that might be involved in the underlying mechanisms.
The investigators hypothesize that short-term sleep curtailment in adolescents is accompanied by 1) increased hunger and desire to eat; 2) increased spontaneous energy intake; 3) reduced spontaneous physical activity; and 4) increased fluctuation in hormones in a way that could favour a positive energy balance and potentially weight gain on the long run.
調査の概要
詳細な説明
The background for this project is that despite considerable knowledge of the mechanisms regulating body weight, the prevalence of obesity has not declined. The individual and environmental factors that play a part in energy balance are still not completely understood, and current methods for loosing and maintaining body weight are generally unsuccessful. Knowledge about what brings about changes in metabolism and lifestyle is lacking.
Reduced sleep duration has been observed in parallel with increases in body weight. Lack of sleep has become a hallmark of modern man, and both children and adults sleep less today than just a few decades ago. Research suggests that both too much and too little sleep can lead to obesity, but correlations between sleep deprivation and other lifestyle-related ailments have also been observed. The reasons for these correlations are far from clear, especially in children and adolescents.
The main purpose of SLOPUS is to investigate the effects of reduced sleep on energy and substrate metabolism, and the relevant hormonal systems involved in the underlying mechanisms. Our hypothesis is that acute sleep deprivation in teenagers leads to increased hunger and desire to eat, increased spontaneous energy intake, decreased spontaneous physical activity, and increased fluctuation in the hormones that control energy metabolism.
The investigators aim to recruit twenty-four healthy, normal weight boys aged 15-19 years with normal sleep pat-terns. The study will be conducted as a randomized, crossover study with two conditions. Each participant will be subjected to short sleep (4 hours) and normal sleep (9 hours), in random order, for three consecutive nights in a respiration chamber. They will stay in the chamber for the 24 hours before the last night. In the respiration chamber energy turnover is measured - both how much energy and also the type of substrate combusted. The chamber is equipped with a bed, toilet, television, computer, and communication. Food and drink can be supplied via an airlock. Measurements in the chamber include volitional activities and sleep duration/quality.
Energy turnover will be measured using a ventilated hood system on the first and last day. Here the participants lie down on a bed with their heads under a transparent canopy for 25-minute intervals during the morning. Blood samples will also be taken during these periods. Meal tests will be served, where we measure the amount of food ingested, and subjects will be given questionnaires about hunger and satiety to fill out. Physical activity and heart rate will be measured throughout the trial.
Thus, the present study is likely to result in a number of new and important findings regarding the impact of impaired sleep on energy balance and it might improve the recommendations for optimal sleep in adolescents.
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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Copenhagen、デンマーク、1958
- Department of Human Nutrition, Faculty of Life Sciences, University of Copenhagen
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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:
- normal weight (5th percentile to less than the 85th percentile)
Exclusion Criteria:
- self-reported sleep problems (Pittsburgh Sleep Quality Index score >5);
- night work;
- variable sleep habits or habitual daytime naps;
- regular physical exercise (>3 hours/week);
- excessive intake of alcohol (>7 drinks/week);
- excessive intake of caffeine (>300 mg/day);
- smoking;
- substance abuse;
- use of prescription medications or over-the-counter drugs affecting sleep or metabolism;
- chronic diseases (e.g. cancer, asthma, back pain, thyroid disease, heart disease, diabetes, etc.)
- history of neurological, medical or sleep disorders;
- trans-meridian travelling the last month;
- eating disorder;
- irregular eating schedule (e.g. skipping breakfast);
- unable to comply with the protocol.
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: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: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:Sleep restriction
Each participant will be engaged in three consecutive nights of 4 hours of sleep per night (from 3.00 a.m. to 7.00 a.m.)
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Duration of sleep per night
他の名前:
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プラセボコンパレーター:Normal sleep duration
Each participant will be engaged in three consecutive nights of 9 hours of sleep per night (from 10.00 p.m. to 7.00 a.m.)
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Duration of sleep per night
他の名前:
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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 |
メジャーの説明 |
時間枠 |
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Energy expenditure
時間枠:Over the course of 24 hours on day 3
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Energy expenditure and substrate oxidation rate will be assessed by 24-hour indirect whole-body calorimetry (respiration chamber) on the basis of measurements of oxygen consumption, carbon dioxide production, and nitrogen excretion in urine.
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Over the course of 24 hours on day 3
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二次結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
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Spontaneous energy intake
時間枠:Measured after a maximum of 30 minutes meal time on day 1 and day 4
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In an attempt to measure spontaneous energy intake in an experimental context, the participant will be given an ad libitum lunch at noon.
The ad libitum meal is a homogenous meal with a macronutrient composition of: 15 E%; fat: 30 E%; carbohydrate: 55 E%.The portion of pasta is larger than the expected participant's intake.
The meal will be weighted before and after the lunch and ad libitum energy intake is assessed from the amount of the meal consumed by a food technician.
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Measured after a maximum of 30 minutes meal time on day 1 and day 4
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Spontaneous physical activity
時間枠:24 hours for 3 consecutive days
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Spontaneous physical activity is measured by a wrist worn actigrpahy device during the three days of intervention.
Moreover, spontaneous activity in the respiration chamber will be assessed by in-biuld microwave radar detectors
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24 hours for 3 consecutive days
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Appetite regulating hormones and stress hormones
時間枠:Measured every half hour over the course of 4 hours on day 1 and day 4
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Hormones are sampled from blood, saliva, and urine.
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Measured every half hour over the course of 4 hours on day 1 and day 4
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Hunger and desire to eat
時間枠:Measured every hour or half hour over the course of 9 hours on day 1 and day 4
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Hunger and desire to eat is measured using visual analogue scales before and after a standardized breakfast meal challange and before and after an ad libitum meal.
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Measured every hour or half hour over the course of 9 hours on day 1 and day 4
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Stress hormone (cortisol)
時間枠:Measured at 7 am and 7.30 am on day 1 and day 4
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Hormones are sampled saliva.
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Measured at 7 am and 7.30 am on day 1 and day 4
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協力者と研究者
スポンサー
捜査官
- 主任研究者:Arne Astrup, MD, PhD、Department of Human Nutrition, Faculty of Life Sciences, University of Copenhagen
- 主任研究者:Anders M Sjödin, MD, PhD、Department of Human Nutrition, Faculty of Life Sciences, University of Copenhagen
出版物と役立つリンク
便利なリンク
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 (見積もり)
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
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。
Sleep durationの臨床試験
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Leiden UniversityBioClock Consortium; Caring Univeristies完了
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Royal Brompton & Harefield NHS Foundation TrustUniversity of Oxford; National Institute for Health Research, United Kingdom完了
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University of California, San Francisco完了