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  • Articles  (50)
  • Other exposures  (23)
  • Air pollution, air quality, Other exposures  (22)
  • Asbestos, Other exposures  (3)
  • Allergy, asthma, Respiratory  (2)
  • 2010-2014  (50)
  • 1
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    Associations between three specific a-cellular measures of the oxidative potential of particulate matter and markers of acute airway and nasal inflammation in healthy volunteers (2014)
    BMJ Publishing Group
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    Publication Date: 2014-12-17
    Description: Introduction We evaluated associations between three a-cellular measures of the oxidative potential (OP) of particulate matter (PM) and acute health effects. Methods We exposed 31 volunteers for 5 h to ambient air pollution at five locations: an underground train station, two traffic sites, a farm and an urban background site. Each volunteer visited at least three sites. We conducted health measurements before exposure, 2 h after exposure and the next morning. We measured air pollution on site and characterised the OP of PM 2.5 and PM 10 using three a-cellular assays; dithiotreitol (OP DTT ), electron spin resonance (OP ESR ) and ascorbic acid depletion (OP AA ). Results In single-pollutant models, all measures of OP were significantly associated with increases in fractional exhaled nitric oxide and increases in interleukin-6 in nasal lavage 2 h after exposure. These OP associations remained significant after adjustment for co-pollutants when only the four outdoor sites were included, but lost significance when measurements at the underground site were included. Other health end points including lung function and vascular inflammatory and coagulation parameters in blood were not consistently associated with OP. Conclusions We found significant associations between three a-cellular measures of OP of PM and markers of airway and nasal inflammation. However, consistency of these effects in two-pollutant models depended on how measurements at the underground site were considered. Lung function and vascular inflammatory and coagulation parameters in blood were not consistently associated with OP. Our study, therefore, provides limited support for a role of OP in predicting acute health effects of PM in healthy young adults.
    Keywords: Air pollution, air quality, Other exposures
    Print ISSN: 1351-0711
    Electronic ISSN: 1470-7926
    Topics: Medicine
    Published by BMJ Publishing Group
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  • 2
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    Occupational exposure to pesticides and endotoxin and Parkinson disease in the Netherlands (2014)
    BMJ Publishing Group
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    Publication Date: 2014-10-09
    Description: Objectives Previous research has indicated that occupational exposure to pesticides and possibly airborne endotoxin may increase the risk of developing Parkinson disease (PD). We studied the associations of PD with occupational exposure to pesticides, specifically to the functional subclasses insecticides, herbicides and fungicides, and to airborne endotoxin. In addition we evaluated specific pesticides (active ingredients) previously associated with PD. Methods We used data from a hospital-based case–control study, including 444 patients with PD and 876 age and sex matched controls. Exposures to pesticides from application and re-entry work were estimated with the ALOHA+job-exposure matrix and with an exposure algorithm based on self-reported information on pesticide use. To assess exposure to specific active ingredients a crop-exposure matrix was developed. Endotoxin exposure was estimated with the DOM job-exposure matrix. Results The results showed almost no significant associations. However, ORs were elevated in the higher exposure categories for pesticides in general, insecticides, herbicides and fungicides, and below unity for endotoxin exposure. The analyses on specific active ingredients showed a significant association of PD risk with the fungicide benomyl. Conclusions This study did not provide evidence for a relation between pesticide exposure and PD. However, the consistently elevated ORs in the higher exposure categories suggest that a positive association may exist. The possible association with the active ingredient benomyl requires follow-up in other studies. This study did not provide support for a possible association between endotoxin exposure and PD.
    Keywords: Other exposures
    Print ISSN: 1351-0711
    Electronic ISSN: 1470-7926
    Topics: Medicine
    Published by BMJ Publishing Group
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  • 3
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    Challenges for occupational epidemiology in the 21st century: observations and opportunities (2014)
    BMJ Publishing Group
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    Publication Date: 2014-10-09
    Description: The 2014 International Epidemiology in Occupational Health (EPICOH) meeting in Chicago, USA, focused on the theme: ‘Challenges for Occupational Epidemiology in the 21st Century’. These are exciting times and with them come no end to challenges faced by occupational epidemiology. And participants eagerly engaged in vigorous discussion on a number of current concerns with both wisdom and wit. Ultimately each individual must decide what challenges are most important and how best to address those selected for first order attention. Nonetheless, some overview of challenges could prove worthwhile and so six general areas are provided as a focus for consideration. Concentrating on important problems Acting on what we find Advancing occupational disease and injury surveillance Relying on worker self-reports Looking at data Addressing health disparities Concentrating on the important problems We always run the risk of studying what we know how to study...
    Keywords: Air pollution, air quality, Other exposures
    Print ISSN: 1351-0711
    Electronic ISSN: 1470-7926
    Topics: Medicine
    Published by BMJ Publishing Group
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  • 4
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    Child health and the environment: where next with birth cohort research? (2014)
    BMJ Publishing Group
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    Publication Date: 2014-09-09
    Description: The fetus and infant are especially vulnerable to the effects of environmental agents that disrupt developmental processes because their organs are rapidly growing and developing, their metabolism is immature and their intakes can be greater relative to their body weight. In utero and early postnatal stressors, including environmental contaminant exposures, can permanently change the body's structure, physiology and metabolism, predisposing individuals to the development of serious chronic pathologies later in life (eg, cardiovascular, respiratory and neurodegenerative disease), a hypothesis grounded in the Developmental Origins of Health and Disease (DOHaD) paradigm for which there is a growing evidential basis. Up to relatively recently, good epidemiological evidence for early-life developmental effects was available only for a few pollutants, mostly at high-level exposure, such as lead, mercury and polychlorinated biphenyls (PCBs). 1 The past decade has seen rapid increase in the study of effects of environmental agents at lower doses on...
    Keywords: Air pollution, air quality, Other exposures
    Print ISSN: 1351-0711
    Electronic ISSN: 1470-7926
    Topics: Medicine
    Published by BMJ Publishing Group
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  • 5
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    Exposure to chlorinated solvents and lung cancer: results of the ICARE study (2014)
    BMJ Publishing Group
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    Publication Date: 2014-09-09
    Description: Objective To investigate the role of occupational exposure to chlorinated solvents in lung cancer aetiology. Methods ICARE (Investigation of occupational and environmental CAuses of REspiratory cancers) is a French, multicentre, population-based, case–control study. Information on the lifelong work history of 2926 cases and 3555 controls was collected using standardised questionnaires. Occupational exposures were assessed using job-exposure matrices for five chlorinated solvents. Solvents were studied separately and in combinations. ORs were computed using unconditional logistic regression models adjusted for classic risk factors, including a history of cigarette smoking and exposure to asbestos. Adjustment for socioeconomic status (SES) was also made. Results After adjustment for exposure to asbestos, we observed a positive, statistically significant association with lung cancer for men and women exposed to a combination of perchloroethylene (PCE), trichloroethylene and dichloromethane (DCM). Further adjustment for SES slightly decreased this association. In contrast, no statistically significant associations were found for other solvent combinations. Conclusions These results suggest that exposure to PCE may constitute a risk factor for lung cancer, especially among women, who seem to have a higher prevalence of exposure than men.
    Keywords: Other exposures
    Print ISSN: 1351-0711
    Electronic ISSN: 1470-7926
    Topics: Medicine
    Published by BMJ Publishing Group
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  • 6
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    Assessment of exposure to shiftwork mechanisms in the general population: the development of a new job-exposure matrix (2014)
    BMJ Publishing Group
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    Publication Date: 2014-09-09
    Description: Objective To develop a job-exposure matrix (JEM) that estimates exposure to eight variables representing different aspects of shiftwork among female workers. Methods Occupational history and shiftwork exposure data were obtained from a population-based breast cancer case–control study. Exposure to light at night, phase shift, sleep disturbances, poor diet, lack of physical activity, lack of vitamin D, and graveyard and early morning shifts, was calculated by occupational code. Three threshold values based on the frequency of exposure were considered (10%, 30% and 50%) for use as cut-offs in determining exposure for each occupational code. JEM-based exposure classification was compared with that from the OccIDEAS application (job-specific questionnaires and assessment by rules) by assessing the effect on the OR for phase shift and breast cancer. Using data from the Australian Workplace Exposure Study, the specificity and sensitivity of the threshold values were calculated for each exposure variable. Results 127 of 413 occupational codes involved exposure to one or more shiftwork variables. Occupations with the highest probability of exposure shiftwork included nurses and midwives. Using the 30% threshold, the OR for the association between phase shift exposure and breast cancer was decreased and no longer statistically significant (OR=1.14, 95% CI 0.92 to 1.42). The 30% cut-off point demonstrated best specificity and sensitivity, although results varied between exposure variables. Conclusions This JEM provides a set of indicators reflecting biologically plausible mechanisms for the potential impact of shiftwork on health and may provide an alternative method of exposure assessment in the absence of detailed job history and exposure data.
    Keywords: Other exposures
    Print ISSN: 1351-0711
    Electronic ISSN: 1470-7926
    Topics: Medicine
    Published by BMJ Publishing Group
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  • 7
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    Occupation exposures and sperm morphology: a case-referent analysis of a multi-centre study (2014)
    BMJ Publishing Group
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    Publication Date: 2014-08-09
    Description: Objective We examined occupational exposures and sperm morphology to establish whether exposures implicated differed from those affecting motile sperm concentration. Methods Computer aided sperm morphometric assessment was undertaken on morphology slides obtained as part of a multi-centre study in 1999–2002 of occupational factors in male infertility. Men attending 14 fertility clinics across the UK were recruited and gave a semen sample. Before results of the semen analysis were known, the men completed detailed questionnaires about their employment and lifestyle. Occupational exposures were assessed by occupational hygienists. Data were analysed using an unmatched case-referent design, allowing for clustering and for confounders. Three case definitions were used: poor morphology (normal morphology 〈4%), low motile sperm count (MSC) (〈4.8 x 10 6 ) and either condition. Results Morphology results were available for 1861/2011 men employed at the time of recruitment. Of these 1861, 296 (15.9%) had poor morphology; of the 2011with sperm count, 453 (22.5%) had low MSC; 654/1981 (33.0%) had either condition. Poor morphology, adjusted for confounding, was related to self-reported lifetime exposure to lead (OR=1.33; 95% CI 1.00 to 1.75). Low MSC was also related to self-reported lead and to hygienist-assessed glycol ether exposure. Self-reported use of paint stripper (OR=1.47; 95% CI 1.07 to 2.03) and lead, but not glycol ether, were significantly related to the combined case definition. Conclusions While this study did not identify any occupational exposure uniquely related to sperm morphology, the capacity of the study to detect risk was increased by including morphology with sperm concentration and motility.
    Keywords: Other exposures
    Print ISSN: 1351-0711
    Electronic ISSN: 1470-7926
    Topics: Medicine
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  • 8
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    Neurodegenerative disease: The next occupational disease epidemic? (2014)
    BMJ Publishing Group
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    Publication Date: 2014-08-09
    Description: Globally, neurological disorders account for about 4% of all deaths and about 5% of disability-adjusted life-years from non-communicable disease. 1 Diagnosis of a neurological disease can be devastating, and in most instances there is no cure. A recent editorial in the Lancet 2 commented that neurological diseases remain neglected and ignored: ‘unlike cancer, stroke, and diabetes, which all have strategies and clinical champions, degenerative disorders are heterogeneous and complex’. Neurological disease includes a broad spectrum of conditions, several of which have occupational causes. The motor neurone diseases (MND) are a spectrum of neurodegenerative disorders characterised by progressive muscular paralysis due to degeneration of motor neurones in the primary motor cortex, brainstem and spinal cord. 3 Although the vast majority of cases of (MND) are ‘sporadic’ (ie, non-genetic), most current research into the causes of MND involves primarily or solely genetic factors and few studies of occupational...
    Keywords: Other exposures
    Print ISSN: 1351-0711
    Electronic ISSN: 1470-7926
    Topics: Medicine
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  • 9
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    Particulate air pollution and preeclampsia: a source-based analysis (2014)
    BMJ Publishing Group
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    Publication Date: 2014-07-11
    Description: Objectives To investigate the association between preeclampsia and maternal exposure to ambient particulate matter (PM) with aerodynamic diameter less than 10 μm (PM 10 ) and 2.5 μm (PM 2.5 ) mass and sources. Methods Our analysis was based on a hospital cohort of pregnant women (N=3182) residing in Barcelona, Spain, during 2003–2005. Positive matrix factorisation source apportionment (PMF2) was used to identify sources of PM 10 and PM 2.5 samples obtained by an urban background monitor, resulting in detection of eight sources. We further combined traffic-related sources (brake dust, vehicle exhaust and secondary nitrate/organics) to generate an indicator of combined traffic sources. Logistic regression models were developed to estimate the association between preeclampsia and exposure to each PM source and mass separately during the entire pregnancy and trimester one, adjusted for relevant covariates. Results For the exposure during the entire pregnancy, we found a 44% (95% CI 7% to 94%) and a 80% (95% CI 4% to 211%) increase in the risk of preeclampsia associated with one IQR increase in exposure to PM 10 brake dust and combined traffic-related sources, respectively. These findings remained consistent after an alternative source apportionment method (Multilinear Engine (ME2)) was used. The results for PM 2.5 mass and sources and also exposure during trimester one were inconclusive. Conclusions: Risk of preeclampsia was associated with exposure to PM 10 brake dust and combined traffic-related sources.
    Keywords: Air pollution, air quality, Other exposures
    Print ISSN: 1351-0711
    Electronic ISSN: 1470-7926
    Topics: Medicine
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  • 10
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    Longitudinal effects of air pollution on exhaled nitric oxide: the Children's Health Study (2014)
    BMJ Publishing Group
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    Publication Date: 2014-06-10
    Description: Objectives To assess the effects of long-term variations in ambient air pollutants on longitudinal changes in exhaled nitric oxide (FeNO), a potentially useful biomarker of eosinophilic airway inflammation, based on data from the southern California Children's Health Study. Methods Based on a cohort of 1211 schoolchildren from eight Southern California communities with FeNO measurements in 2006–2007 and 2007–2008, regression models adjusted for short-term effects of air pollution were fitted to assess the association between changes in annual long-term exposures and changes in FeNO. Results Increases in annual average concentrations of 24-h average NO 2 and PM 2.5 (scaled to the IQR of 1.8 ppb and 2.4 μg/m 3 , respectively) were associated with a 2.29 ppb (CI 0.36 to 4.21; p=0.02) and a 4.94 ppb (CI 1.44 to 8.47; p=0.005) increase in FeNO, respectively, after adjustments for short-term effects of the respective pollutants. In contrast, changes in annual averages of PM 10 and O 3 were not significantly associated with changes in FeNO. These findings did not differ significantly by asthma status. Conclusions Changes in annual average exposure to current levels of ambient air pollutants are significantly associated with changes in FeNO levels in children, independent of short-term exposures and asthma status. Use of this biomarker in population-based epidemiological research has great potential for assessing the impact of changing real world mixtures of ambient air pollutants on children's respiratory health.
    Keywords: Air pollution, air quality, Other exposures
    Print ISSN: 1351-0711
    Electronic ISSN: 1470-7926
    Topics: Medicine
    Published by BMJ Publishing Group
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