Exposure to traffic-related air pollution and noise exposure contributes to detrimental effects on cardiac function, but the underlying short-term effects related to their simultaneous personal exposure remain uncertain. The aim is to assess the impact of total inhaled dose of particulate matter and total noise exposure on the variations of electrocardiogram (ECG) parameters between pre-cycling and post-cycling periods. Mid-June 2019, we collected four participants’ personal exposure data related to traffic-related noise and particulate matter (PM2.5 and PM10) as well as ECG parameters. Several Bayesian linear models were built to examine a potential association between air pollutants and noise exposure and ECG parameters: heart rate (HR), standard deviation of the normal-to-normal intervals (SDNN), percentage of successive RR intervals that differ by more than 50 ms (pNN50), root mean square of successive RR interval differences (rMSSD), low-frequency power (LF), high-frequency power (HF), and ratio of low- to high-frequency power (LF/HF). We analyzed in total 255 5-min segments of RR intervals. We observed that per 1 µg increase in cumulative inhaled dose of PM2.5 was associated with 0.48 (95% CI: 0.22; 15.61) increase in variation of the heart rate, while one percent of total noise dose was associated with 0.49 (95% CI: 0.17; 0.83) increase in variation of heart rate between corresponding periods. Personal noise exposure was no longer significant once the PM2.5 was introduced in the whole model, whilst coefficients of the latter that were significant previously remained unchanged. Short-term exposure to traffic-related air and noise pollution did not, however, have an impact on heart rate variability.

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L' évaluation d'impact sur la santé (ÉIS) permet d' analyser les impacts potentiels sur la santé des actions (politique, projet, programme) qui ne relèvent pas du secteur de la santé. Par exemple, les projets municipaux, comme la revitalisation urbaine ou l' aménagement urbain, ont un impact sur les déterminants de santé liés à l' environnement bâti, et par là, sur la santé de la population. Au Québec, le gouvernement et les organismes affi liés sont appelés à se prononcer sur les impacts potentiels; ils recourent à l'ÉIS pour que la santé soit prise en compte dans toutes les actions publiques. Nous connaissons bien peu de choses sur la capacité des ÉIS à infl uencer les politiques publiques et le fait que chaque politique ou programme soit diff érent et ne soit implanté bien souvent qu'une seule fois, en complique l' évaluation. Notre objectif est d' analyser le potentiel de l' analyse de la contribution pour l' évaluation des impacts d'ÉIS au niveau municipal. Pour ce faire, nous présentons la démarche d'ÉIS telle qu'implantée en Montérégie, nous identifi ons les défi s pour l' évaluation et proposons, par l' analyse de la contribution, une stratégie d' évaluation pour l' analyse des eff ets. Mots clés : évaluation d'impact sur la santé, analyse de contribution, analyse des eff ets, complexité, aménagement urbainAbstract: Health impact assessments (HIA) allow the potential impact of nonhealth-related actions (policy, project, program) on health to be analyzed. For example, municipal projects, for urban renewal or urban planning, have an impact on health drivers relating to the created environment, and thus, on public health. In the province of Quebec, the government and affi liated organizations have to comment on potential impacts; they use HIAs to ensure health is factored into public actions. We know little about HIAs' capacity to infl uence public policies; every policy and program is diff erent and is oft en implemented only once, greatly complicating evaluation. Our goal is to analyze the potential of contribution analysis for evaluating the impact of HIAs at the municipal level. To this end, we present the HIA process as implemented in Montérégie, we identify evaluation challenges, and put forth, through contribution analysis, an evaluation strategy to analyze eff ects.