Longitudinal effects of the built environment on transportation and recreational walking and differences by age and sex: A systematic review

Non-communicable diseases (NCDs) and physical inactivity, a well-established risk factor, are prevalent in high-income countries. Walking is an effective means of improving population physical activity levels. Previous, mostly cross-sectional research finds that the built environment encourages or discourages walking for transport and recreation, with this association varying for different age groups and sexes. The objective of this systematic review is to synthesise longitudinal evidence to better understand the built environment in determining transport and recreational walking for men, women, working aged adults, and older adults in high-income countries. A systematic literature search for peer-reviewed journal articles in English was carried out using seven electronic databases. To be included, studies had to be conducted in a high-income country, employed a longitudinal design, used objectively measured neighbourhood attributes, and quantitatively assessed how the built environment impacts transport and recreational walking for adults. The methodological quality of the studies was evaluated using an established instrument. In total, 23 longitudinal studies published between 2012 and 2022 were identified. Notably, the evidence was inconclusive for age- and sex-specific population sub-groups due to the limited number of studies. However, in the general population, we found prospective evidence more consistently supporting the idea that increasing street connectivity, destination accessibility, and access to transit contribute to higher levels of transport walking. Furthermore, we found mixed evidence for the associations of road attributes and residential density with transport walking, as well as for street connectivity and destination accessibility with recreational walking. The findings of the review emphasize the importance of designing neighbourhoods supportive of transport and recreational walking to increase physical activity and, therefore, mitigate NCDs in high-income countries. Further longitudinal studies are needed to investigate how changes in built environment attributes influence transport and recreational walking differently among males, females, working aged adults, and older adults.