Sawka, Keri JoMcCormack, Gavin R.Nettel-Aguirre, AlbertoBlackstaffe, AnitaPerry, RosemaryHawe, Penelope2018-09-272018-09-272014-09-24Keri Jo Sawka, Gavin R. McCormack, Alberto Nettel-Aguirre, Anita Blackstaffe, Rosemary Perry, and Penelope Hawe, “Associations between Aspects of Friendship Networks, Physical Activity, and Sedentary Behaviour among Adolescents,” Journal of Obesity, vol. 2014, Article ID 632689, 12 pages, 2014. doi:10.1155/2014/632689http://hdl.handle.net/1880/108217https://doi.org/10.11575/PRISM/45195Background. Adolescent friendships have been linked to physical activity levels; however, network characteristics have not been broadly examined. Method. In a cross-sectional analysis of 1061 adolescents (11–15 years), achieving 60 minutes/day of moderate-to-vigorous physical activity (MVPA) and participating in over 2 hours/day of sedentary behaviour were determined based on friendship network characteristics (density; proportion of active/sedentary friends; betweenness centrality; popularity; clique membership) and perceived social support. Results. Adolescents with no friendship nominations participated in less MVPA. For boys and girls, a ten percent point increase in active friends was positively associated with achievement of 60 minutes/day of MVPA (OR 1.11; 95% CI 1.02–1.21, OR 1.14; 95% CI 1.02–1.27, resp.). For boys, higher social support from friends was negatively associated with achieving 60 minutes/day of MVPA (OR 0.63; 95% CI 0.42–0.96). Compared with low density networks, boys in higher density networks were more likely to participate in over 2 hours/day of sedentary behaviour (OR 2.93; 95% CI 1.32–6.49). Social support from friends also modified associations between network characteristics and MVPA and sedentary behaviour. Conclusion. Different network characteristics appeared to have different consequences. The proportion of active close friends was associated with MVPA, while network density was associated with sedentary behaviour. This poses challenges for intervention design.Journal Article2018-09-27enCopyright © 2014 Keri Jo Sawka et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.https://doi.org/10.1155/2014/632689