Background
Noncommunicable diseases are major contributors to morbidity and mortality worldwide. Modifying the risk factors for these conditions, such as physical inactivity, is thus essential. Addressing the context or circumstances in which physical activity occurs may promote physical activity a...t a population level. We assessed the effects of infrastructure, policy or regulatory interventions for increasing physical activity.
Methods
We searched PubMed, Embase and clinicaltrials.gov to identify randomised controlled trials (RCTs), controlled before-after (CBAs) studies, and interrupted time series (ITS) studies assessing population-level infrastructure or policy and regulatory interventions to increase physical activity. We were interested in the effects of these interventions on physical activity, body weight and related measures, blood pressure, and CVD and type 2 diabetes morbidity and mortality, and on other secondary outcomes. Screening and data extraction was done in duplicate, with risk of bias was using an adapted Cochrane risk of bias tool. Due to high levels of heterogeneity, we synthesised the evidence based on effect direction.
Results
We included 33 studies, mostly conducted in high-income countries. Of these, 13 assessed infrastructure changes to green or other spaces to promote physical activity and 18 infrastructure changes to promote active transport. The effects of identified interventions on physical activity, body weight and blood pressure varied across studies (very low certainty evidence); thus, we remain very uncertain about the effects of these interventions. Two studies assessed the effects of policy and regulatory interventions; one provided free access to physical activity facilities and showed that it may have beneficial effects on physical activity (low certainty evidence). The other provided free bus travel for youth, with intervention effects varying across studies (very low certainty evidence).
Conclusions
Evidence from 33 studies assessing infrastructure, policy and regulatory interventions for increasing physical activity showed varying results. The certainty of the evidence was mostly very low, due to study designs included and inconsistent findings between studies. Despite this drawback, the evidence indicates that providing access to physical activity facilities may be beneficial; however this finding is based on only one study. Implementation of these interventions requires full consideration of contextual factors, especially in low resource settings.
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Background
Asthma remains highly prevalent, with more severe symptoms in low-income to middle-income countries (LMICs) compared with high-income countries. Identifying risk factors for severe asthma symptoms can assist with improving outcomes. We aimed to determine the prevalence, severity and ris...k factors for asthma in adolescents in an LMIC.
Methods
A cross-sectional survey using the Global Asthma Network written and video questionnaires was conducted in adolescents aged 13 and 14 from randomly selected schools in Durban, South Africa, between May 2019 and June 2021.
Results
A total of 3957 adolescents (51.9% female) were included. The prevalence of lifetime, current and severe asthma was 24.6%, 13.7% and 9.1%, respectively. Of those with current and severe asthma symptoms; 38.9% (n=211/543) and 40.7% (n=147/361) had doctor-diagnosed asthma; of these, 72.0% (n=152/211) and 70.7% (n=104/147), respectively, reported using inhaled medication in the last 12 months. Short-acting beta agonists (80.4%) were more commonly used than inhaled corticosteroids (13.7%). Severe asthma was associated with: fee-paying school quintile (adjusted OR (CI)): 1.78 (1.27 to 2.48), overweight (1.60 (1.15 to 2.22)), exposure to traffic pollution (1.42 (1.11 to 1.82)), tobacco smoking (2.06 (1.15 to 3.68)), rhinoconjunctivitis (3.62 (2.80 to 4.67)) and eczema (2.24 (1.59 to 3.14)), all p<0.01.
Conclusion
Asthma prevalence in this population (13.7%) is higher than the global average (10.4%). Although common, severe asthma symptoms are underdiagnosed and associated with atopy, environmental and lifestyle factors. Equitable access to affordable essential controller inhaled medicines addressing the disproportionate burden of asthma is needed in this setting.
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Cette publication présente le Programme sur la santé, l’environnement et les changements climatiques pour les Amériques 2021-2030. Le Programme est un appel à l’action au secteur de la santé pour qu’il prenne l’initiative d’agir sur les déterminants environnementaux de la santé dans... les Amériques. L’Organisation panaméricaine de la Santé (OPS) travaillera avec les États Membres pour atteindre son but et son objectif, qui consistent à permettre à tous de vivre en bonne santé et à promouvoir le bien-être de tous à tout âge, en employant une approche durable et équitable qui accorde la priorité à la réduction des iniquités en matière de santé. Le programme a été élaboré sous l’égide de la Stratégie mondiale de l’OMS sur la santé, l’environnement et les changements climatiques et s’appuie sur les engagements énoncés dans le Programme d’action sanitaire durable pour les Amériques 2018-2030 et le Plan stratégique de l’OPS 2020-2025. Le programme a été élaboré en consultation avec le groupe consultatif technique et par un processus décisionnel consensuel avec les États Membres au cours de la période 2019-2020. En vue de la réalisation de l’objectif de développement durable 3, le programme se concentre sur l’amélioration de la performance des programmes et des institutions de santé publique environnementale, la promotion de systèmes de santé résilients et durables sur le plan environnemental et la promotion de villes et de communautés saines et résilientes sur le plan environnemental. Sa mise en œuvre sera adaptée au contexte, en fonction des besoins et des réalités des pays. Il profitera aux pays et aux territoires en encourageant les pratiques de bonne gouvernance, en renforçant les rôles de leadership et de coordination du secteur de la santé, en favorisant l’action intersectorielle, en se concentrant sur la prévention primaire et en améliorant les données probantes et la communication. Il facilitera l’accès aux ressources humaines, techniques et financières nécessaires pour agir sur les déterminants environnementaux de la santé et fera en sorte que la Région soit pleinement engagée dans les processus et les accords mondiaux en matière de santé, d’environnement et de changements climatiques.
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