COVID-19 and working from home-related changes in physical activity in Sydney, Australia.

ISSUES ADDRESSED: Evidence on how COVID-19 lockdowns impacted physical activity (PA) is mixed. This study explores changes in PA following initial mobility restrictions, and their subsequent relaxation, in a sample of Sydney (Australia) residents using a natural experiment methodology. METHODS: Participants' health and travel behaviours were collected pre-pandemic in late 2019 (n = 1937), with follow-up waves during the pandemic in 2020 (n = 1706) and 2021 (n = 1514). Linear mixed-effects models were used to analyse changes in weekly duration of PA between the three waves. RESULTS: Compared with pre-pandemic, average weekly PA increased in 2021 by 42.6 min total PA (p = .001), 16 min walking PA (p = .02), and 26.4 min moderate-vigorous PA (MVPA) (p = .003). However, average weekly sessions of PA decreased in 2020 and remained lower in 2021. For participants who were sufficiently active in 2019, weekly total PA (-66.3 min) MVPA (-43.8 min) decreased in 2020 compared to pre-pandemic. Conversely, among participants who were insufficiently active in 2019, average weekly PA increased in both 2020 (total PA, +99.1 min; walking PA, +46.4 min; MVPA +52.8 min) and 2021 (total PA, +117.8 min; walking PA, +58.4 min; MVPA +59.2 min), compared to 2019. Participants who did more work from home increased their average weekly total PA in 2021 compared to pre-pandemic (+45.3 min). CONCLUSION: These findings reveal the complex variability in PA behaviour brought about by the pandemic. SO WHAT?: Strategies to support the population in achieving sufficient PA must focus on maintaining an appetite for PA as we move out of the pandemic and on promoting more frequent PA sessions.

Perceptions of air quality and concern for health in relation to long-term air pollution exposure, bushfires, and COVID-19 lockdown: A before-and-after study.

Background: Air pollution is a major health burden and the leading environmental risk factor for non-communicable diseases worldwide. People's perceptions and concerns about air pollution are important as they may predict protective behaviour or support for climate change mitigation policies. Methods: This repeat cross-sectional study uses survey data collected from participants in Sydney, Australia in September-November 2019 (n = 1,647) and October-December 2020 (n = 1,458), before and after the devastating 2019/2020 bushfires and first COVID-19 lockdown restrictions in Sydney in 2020. Participants' perceptions of air quality and concerns for health in relation to air quality were modeled against estimates of annual average NO2 and PM2.5 concentrations in their neighbourhood. Results: Participants in suburbs with higher estimated air pollution concentrations generally perceived poorer air quality and were more concerned for health in relation to air quality. A 5 µg/m3 increase in NO2 was associated with perceived poorer air quality (OR 1.32, 95%CI 1.18-1.47). A 1 µg/m3 increase in estimated PM2.5 was associated with perceived poorer air quality (OR 1.37, 95%CI 1.24-1.52) and greater concern for health (OR 1.18, 95%CI 1.05-1.32). Air quality was perceived as better in 2020 than in 2019 in both NO2 and PM2.5 models (p<0.001). Air quality concern increased in 2020 in both models. Discussion: This study provides the first Australian data on the association between estimated air quality exposure and air quality perceptions and concerns, contributing new evidence to inform public health approaches that increase awareness for air pollution and reduce the health burden.

Interventions Designed to Support Physical Activity and Disease Prevention for Working from Home: A Scoping Review.

Working from home (WfH) has public health implications including changes to physical activity (PA) and sedentary behavior (SB). We reviewed published and grey literature for interventions designed to support PA or reduce SB in WfH contexts. From 1355 published and grey literature documents since 2010, we screened 136 eligible documents and extracted ten intervention studies. Interventions designed specifically for WfH were limited and included structured exercise programs, infrastructure (e.g., sit-stand workstations), online behavioral and educational programs, health professional advice and peer support, activity trackers and reminder prompts. Evidence of interventions to improve PA and reduce SB in WfH contexts is emergent but lacking in variety and in utilization of local environments to promote good health. Evidence is needed on the adaptation of existing workplace interventions for home environments and exploration of opportunities to support PA through alternative interventions, such as urban planning and recreational strategies.