Teun Remmers

Afterschool PA and the built environment using GPS, GIS and accelerometers | 135 Participant's afterschool behaviour in various contexts On average, children spent the highest percentage of afterschool active minutes (i.e. combined LPA and MVPA) on sports grounds (41% in MVPA) and active transport (37% in MVPA). Most of the children participated in these activities at least once in the measurement period. Children spent the lowest average percentage of active minutes afterschool on their residential parcel (4% in MVPA). During afterschool leisure time, 13% of the minutes were moderate-to-vigorously active (Table 2). We investigated the amount of time that children spent in their multi-place environment (i.e. within school, residence and daily transport buffer; Figure 2). We found that in approximately 65% of the days, children spent at least 80% of their afterschool time within their multi-place environment. This was similar for leisure time and active transport (i.e. 68% and 63%, respectively). This means that the vast majority of children's afterschool leisure time and active transport behaviour occurred within their multi-place environment. Meteorological circumstances Meteorological circumstances significantly affected children's leisure time PA and transport PA. Days with at least 0.2 mm of total rain (versus no rain) were associated with less MVPA leisure time and fewer active minutes in cycling and walking. In addition, higher temperatures were related with more active minutes while cycling and less activity in MVPA leisure time (Table 3). In subsequent models, meteorological circumstances were controlled for. Association between PA and first-level environmental features Larger multi-place environments, typically the case for children that lived further from their school (Figure 2), were associated with less active minutes of walking after school, and more active minutes of cycling. First-level environmental features were not associated with afterschool leisure time PA. In afterschool active transport, however, higher spatial density of roads and buildings were related with less active minutes of cycling, while a higher density of roads on the other hand, was related to more minutes of walking (Table 3). Association between afterschool leisure time PA and second-level built environment features Relationships between second-level features of the built-environment and leisure time PA are shown in Table 4. Multi-variate results showed that smaller multi-place environments and higher spatial densities of agriculture, lawns, shrubs, and local roads were associated with more minutes of leisure time PA of light intensity. Higher density of highways was associated with less minutes of light intensity leisure time PA. In addition, more active minutes of leisure time of MVPA intensity were associated with smaller multi-place environments and a higher density of buildings, lawns, shrubs and pedestrian paths. A higher density of playgrounds was not associated with more minutes of leisure time PA.