HIPWOODS - Health Effects Related to Exposure to Particle Pollution From Woodburning Stoves (HIPWOODS)
Health Effects Related to Exposure to Particle Pollution From Woodburning
The study intends to focus on health effects and symptoms related to particle exposure from wood burning stoves
The objective is to determine whether moderate exposure to particles from wood smoke in a real life situation causes an systemic inflammatory response in peripheral blood or in lower airways. 24 healthy subjects (normal healthy subjects and mild asthmatics to study the asthmatic response) is selected for the study. A randomized double blind crossover procedure will be followed with a PM exposure concentration of 200ug/m3, 400ug/m3 or clean air as the control exposure. Exposure will take place in a climate chamber using wood burning in an appropriate wood stove.
調査の概要
詳細な説明
Public health is concerned with the physical, mental and environmental health of communities and populations at risk for disease and injury. Generally, the determination of health effects associated with indoor and outdoor exposures is difficult since documented cause-and-effect relationships are rare and the exposure and dosage data is sparse. Information about actual human exposure to different types of pollution has several important uses, including informing risk assessments, helping predict the potential consequences of exposures, and developing exposure criteria for regulations and other public policy guidance.
Wood-burning stoves have been a popular heating source for decades. Unfortunately, wood-burning stoves can emit substantial quantities of pollutants to outdoor and indoor air. Among the pollutants are: chlorinated dioxin, carbon monoxide, methane, volatile organic compounds (VOC), nitrogen oxides, polycyclic aromatic hydrocarbons (PAH), and fine particulate matter (PM10, PM2.5, fine and ultra fine particles). Recent studies indicate that the use of wood-burning stoves for heating of dwellings is one of the important outdoor particle sources [Glasius et al. 2004] in residential district in Denmark. This has resulted in an increase in public exposure to indoor and outdoor wood smoke related pollutants, which has prompted widespread concern about the adverse human health consequences that may be associated with wood smoke exposure.
Air pollution is a major aggravation of respiratory symptoms and disease. Effects are decreases in pulmonary function and evidence of inflammation as well as suggestions of increases in chronic respiratory disease. Orozco-Levi et al. (2006) showed strong association between wood smoke exposure and obstructive pulmonary disease. Several studies have shown that especially the small particles, has an effect on airways, and that asthmatic subjects may be the group at greatest risk from air pollutants. The awareness of the impact of airborne particles, particularly fine and ultra fine particles, on health is growing. In recent years, exposure to fine and ultra fine airborne particles has been identified as an important factor affecting human health [Seaton et al., 1995; Schwartz et al., 1996; Oberdörster et al., 1994; Alvin et al., 2000]. Several researchers hypothesize that an increased mortality is associated with the particle levels prevailing in urban air [Jamriska et al., 1999; Dockery et al., 1993]. Mølhave et al (2000; 2005) have suggested that reactive short-lived compounds resulting from reactions between ozone and particulate matter cause indoor air quality complaints and objective health effects such as impaired lung functions.
Particulate air pollution is also known to increase cardiovascular morbidity and mortality. Still the existing scientific knowledge and foundation for evaluating the underlying mechanisms and influence of particle exposure on human immune system are limited. Wood smoke particles, at levels that can be found in smoky indoor environments, seem to affect inflammation. Barregard et al observed a significant increase in S-Amyloid and Faktor VIII/vWf after 0, 3 and 20 hours of exposure to wood smoke. After 20 hours also and increase in Faktor VIII was registred. Surpise-lingly, an IL.-6 decrease was observed after 3 hours. [Barregard et al, 2006]. The particles may also act by increasing blood coagulation factors [Seaton et al 1995]. Both effects may be involved in the mechanisms whereby particulate air pollution affects cardiovascular morbidity and mortality.
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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Aarhus C、デンマーク、8000
- Institute of Environmental and Occupational Medicine , Institute of Public Health , The Faculty of Health Sciences
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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:
- Twenty-four, non-smoking atopic volunteers with normal lung function and bronchial reactivity are recruited for the study. Atopy is determined by skin-prick testing to common aeroallergens.
Exclusion Criteria:
- Smokers, pregnant women and other subjects with current or previous diseases, which could involve a risk for the subject or possibly influence the outcome measurements, will be excluded from the study.
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
- 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:ダブル
武器と介入
参加者グループ / アーム |
介入・治療 |
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偽コンパレータ:1
Clean air
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Subjects are exposed at rest to the exposures for 3 h in our climate chamber
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実験的:2
Wood smoke particle concentration of 200 ug/m3
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Subjects are exposed at rest to the exposures for 3 h in our climate chamber
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実験的:3
Wood smoke particle concentration of 400 ug/m3
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Subjects are exposed at rest to the exposures for 3 h in our climate chamber
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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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Different Inflammation Biomarkers
時間枠:Baseline and follow up measurement after exposure 0 hours post, a 6 hours post and 20 hours post.
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Baseline and follow up measurement after exposure 0 hours post, a 6 hours post and 20 hours post.
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二次結果の測定
結果測定 |
時間枠 |
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Baseline and follow up measurements are: spirometry, exhaled breath condensate, nasal lavage, nasal patency, blood sampling and symptoms.
時間枠:Baseline and follow up measurement after exposure 0 hours post, a 6 hours post and 20 hours post.
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Baseline and follow up measurement after exposure 0 hours post, a 6 hours post and 20 hours post.
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協力者と研究者
スポンサー
捜査官
- 主任研究者:Torben Sigsgaard, Professor、Department of Environmental and Occupational Medicine , Institute of Public Health , The Faculty of Health Sciences
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。
Wood smoke particlesの臨床試験
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University of California, San FranciscoJohns Hopkins University; National Cancer Institute (NCI); University of California, Berkeley; National...完了