NCT04864600

CANDLE - A Study of Acute Health Effects of Exposure to Particles Generated by Candles

• Status: Completed
• Phase: N/A
• Study type: Interventional
• Enrollment: 17 (actual)
• Sponsor: University of Aarhus · Academic / Other
• Sex: All
• Age: 18 Years – 25 Years
• Healthy volunteers: Not accepted

Summary

INTRODUCTION: Particle contamination is suggested to have substantial negative effects on health, with candles emitting huge amount of particles, thus being one of the largest contributors to indoor air pollution. Chronic low levels of exposure to indoor particles over time is an important risk factor for the health of the population as a whole and it becomes particularly important for vulnerable groups like people suffering from respiratory diseases such as asthma. AIM: In a randomized controlled cross-over trial the difference in health effects between two candles I) a standard candle and II) a low emission candle modified from the standard candle is studied.

Detailed description

INTRODUCTION; Particle contamination is suggested to have substantial negative effects on health, with candles emitting the huge amount of particles, thus being one of the largest contributors to indoor air pollution. Chronic low levels of exposure to indoor particles over time is an important risk factor for the health of the population as a whole and it becomes particularly important for vulnerable groups like children and the elderly or people already suffering from allergies and respiratory diseases such as asthma. AIM: To study the difference in health effects between two candles I) a standard candle and II) a low emission candle modified from the standard candle. The following hypothesis will be examined: Short-term exposure to particles generated by the standard candle is associated with more objectively measurable effects in metabolomics inflammation compared to exposure to modified low-emission candle particles. METHODS: Separated by two weeks 20 young asthmatics will be exposed in a randomized cross-over double-blind study under controlled conditions in a climate chamber to three different exposures; A) a standard (Scandinavian) stearin candle, B) a modified low emitting version of the same candle, and C) clean air from the adjacent chamber. The experiment will be carried out in groups of 3-6 participants. MEASUREMENTS: TSI P-TRAK Ultrafine Particle Counter and SMPS will be used for particle counts. Health effects, including spirometry and fraction of exhaled nitric oxide (FeNO) will be evaluated in relation to local and systemic effects prior to, right after and 24 h. after exposure. ANALYSIS: Mixed methods approach taking both time and exposure into account.

Conditions

• Inflammatory Response
• Symptoms and Signs

Interventions

Type	Name	Description
OTHER	Candle C	Burning candles will produce particulate air pollution being passed on an exposure chamber where the participants will be sitting for 5 hours.
OTHER	Candle 1	Burning candles will produce particulate air pollution being passed on an exposure chamber where the participants will be sitting for 5 hours.

Timeline

• Start date: 2020-09-01
• Primary completion: 2020-12-31
• Completion: 2020-12-31
• First posted: 2021-04-29
• Last updated: 2021-04-29

Locations

1 site across 1 country: Denmark