This study aims to explore the cardiopulmonary health effects of indoor air purification and other indoor environmental conditions among young healthy college students in Beijing, China.
The present randomized, double-blind crossover study was conducted to investigate the cardiopulmonary health effects of air purification among 81 young healthy college students in Beijing, China. Real or sham purification was performed in the dormitories for 4 days, following a 15-day wash-out period in the intervals. During the study periods, the investigators collected indoor exposure levels of size-fractionated particulate matter (PM), black carbon (BC), noise, ozone, nitrogen dioxide, carbon dioxide, volatile organic compounds, temperature, relative humidity, illumination, and microorganism. Biological specimens (i.e., morning urine, fasting venous blood, exhaled breath condensate, and nasal mucus) were also collected and examined. Some important individual factors including demographical information (age, sex, height, weight, etc.), physical activity, sleep condition, mood and cognition, and food intake were also gathered using questionaire or anthropometric measurements, in order to control for the potential confounding effects. For further data analyses, air pollutants, noise, and other exposures would be controlled as confounders when addressing the health effects associated with air purification, and would also be used to explore their effects on cardiopulmonary health. The interaction effects of air pollutants, noise, and other exposures on cardiopulmonary health would also be explored.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
PREVENTION
Masking
DOUBLE
Enrollment
81
Real purification and sham purification would be conducted in the dormintory rooms (about 25 in total) of the study subjects for 4 days, following a randomized crossover design, which means a real air purifier and a sham purifier would be placed in the same dormintory room with a wash-out interval (15 days).
Peking University
Beijing, China
Changes in heart rate variability
Including the standard deviation of all normal-to-normal R-R intervals (SDNN) in millisecond, standard deviation of sequential five-minute R-R interval means (SDANN) in millisecond, root-mean-square difference of successive normal R-R intervals (rMSSD) in millisecond, low frequency (LF) in squared millisecond, and high frequency (HF) in squared millisecond.
Time frame: Baseline and after the completion of intervention period (a 4-day real purifier intervention or a 4-day sham purifier intervention)
Changes in blood pressure
Including the systolic blood pressure (SBP) in mmHg, diastolic blood pressure (DBP) in mmHg, and pulse pressure (PP) in mmHg.
Time frame: Baseline and after the completion of intervention period (a 4-day real purifier intervention or a 4-day sham purifier intervention)
Changes in pulmonary function
Including forced expiratory volume in 1 s (FEV1) in liter, forced vital capacity (FVC) in liter, forced expiratory volume in 1 s (FEV1) / forced vital capacity (FVC) ratio, and peak expiratory flow (PEF) in liter per second.
Time frame: Baseline and after the completion of intervention period (a 4-day real purifier intervention or a 4-day sham purifier intervention)
Changes in levels of airway inflammation
Respiratory inflammation Fractional exhaled nitric oxide (FeNO) test would be conducted.
Time frame: Baseline and after the completion of intervention period (a 4-day real purifier intervention or a 4-day sham purifier intervention)
Changes in levels of C-reactive protein (CRP)
Examining the C-reactive protein (CRP) in blood sample to characterize the levels of inflammation.
Time frame: Baseline and after the completion of intervention period (a 4-day real purifier intervention or a 4-day sham purifier intervention)
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Changes in levels of 8-hydroxydeoxyguanosine (8-OHdG)
Examining the 8-hydroxydeoxyguanosine (8-OHdG) in urine sample to characterize the levels of oxidative stress.
Time frame: Baseline and after the completion of intervention period (a 4-day real purifier intervention or a 4-day sham purifier intervention)
Changes in levels of sleep-related parameters
Including time in bed in minute, total sleep time and sleep stage time in minute. The time in bed and total sleep time would be calculated to sleep efficiency in percentage.
Time frame: Baseline and after the completion of intervention period (a 4-day real purifier intervention or a 4-day sham purifier intervention)
Changes in levels of sleep-breathing parameters
Including blood oxygen saturation in percentage and heart rate in bpm.
Time frame: Baseline and after the completion of intervention period (a 4-day real purifier intervention or a 4-day sham purifier intervention)
Changes in levels of cognitive function
Including short-term memory and delayed memory in unit measured by the standard Stroop Test, as well as executive function in unit measured by the Harmonized Cognitive Assessment Protocol.
Time frame: Baseline and after the completion of intervention period (a 4-day real purifier intervention or a 4-day sham purifier intervention)
Changes in levels of cognitive function-related biomarkers
Including serum brain derived nerve factor (BDNF) in ng/mL, S100B protein in ng/mL, and neuron-specific-enolase (NSE) in ng/mL.
Time frame: Baseline and after the completion of intervention period (a 4-day real purifier intervention or a 4-day sham purifier intervention)
Changes in levels of blood cell parameters
Including white blood cells in unit, red blood cells in unit, and platelets in unit measured by blood routine examination.
Time frame: Baseline and after the completion of intervention period (a 4-day real purifier intervention or a 4-day sham purifier intervention)
Changes in levels of systematic inflammation and oxidative stress indicators
Including interleukin-6 (IL-6) in unit, IL-8 in unit, IL-10 in unit, IL-13 in unit, IL-5 in unit, IL-1β in unit, IL-17A in unit, IL-12p70 in unit, tumor necrosis factor-α (TNF-α) in unit, interferon-γ (IFN-γ) in unit, monocyte chemoattratctant protein-1 (MCP-1) in unit, angiotensin II (Ang-II) in unit, superoxide dismutase (SOD) in unit, glutathione (GSH) in unit, nitric oxide levels (NOX) in unit.
Time frame: Baseline and after the completion of intervention period (a 4-day real purifier intervention or a 4-day sham purifier intervention)
Changes in levels of glucose metabolites in serum
Serum samples were collected for targetted glucose metabolomics analysis using the gas chromatography and mass spectrometry (GC-MS).
Time frame: Baseline and after the completion of intervention period (a 4-day real purifier intervention or a 4-day sham purifier intervention)
Changes in levels of neurotransmitter metabolites in serum
Serum samples were collected for targetted neurotransmitter metabolomics analysis using the gas chromatography and mass spectrometry (GC-MS).
Time frame: Baseline and after the completion of intervention period (a 4-day real purifier intervention or a 4-day sham purifier intervention)
Changes in levels of microbiomics in nasal mucus
Nasal mucus samples were collected for microbiomics analysis to examine the microbial community abundance (α-diversity).
Time frame: Baseline and after the completion of intervention period (a 4-day real purifier intervention or a 4-day sham purifier intervention)
Changes in levels of microbiomics in EBC
EBC samples were collected for microbiomics analysis to examine the microbial community abundance (α-diversity).
Time frame: Baseline and after the completion of intervention period (a 4-day real purifier intervention or a 4-day sham purifier intervention)
Changes in levels of pituitary-related hormones
Including serum levels of cortisol, adreno-cortico-tropic-hormone (ACTH), and thyroid stimulating hormone (TSH).
Time frame: Baseline and after the completion of intervention period (a 4-day real purifier intervention or a 4-day sham purifier intervention)