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Background Longitudinal studies demonstrate that physical activity (PA) declines on average from adolescence to early adulthood. However, some subgroups of adolescents increase activity while others decrease or maintain high or low activity. Determinants of change or maintenance of (in)activity may differ between subgroups and are valuable information for targeted health promotion. The purpose of this study was to identify PA patterns from adolescence to early adulthood, and also to explore how different activity domains and Sedentary Behaviour (SB) are associated with PA patterns. Methods The data of this observational cohort study (collected in 2013/2014 and 2017/2018) consisted of 254 Finns at age 15 and 19 participating the Health Promoting Sports Club study. K-means cluster analysis for longitudinal data was performed to identify participant clusters (patterns) based on their accelerometry-measured moderate-to-vigorous PA (MVPA). Associations of sports club participation (SC), active commuting (AC), and SB with PA patterns were examined by logistic regression analysis. Results (preliminary) Five MVPA patterns were identified: inactivity maintainers (n = 71), activity maintainers (n = 70), decreasers from moderate (to low) PA (n = 61), decreasers from high (to moderate) PA (n = 32), and increasers (n = 20). At age 15, SC participation (41-97%) and AC (47-75%) were common in all the patterns. By age 19, clear dropout from these activities was prevalent (SC participation mean 32%, AC 31-63%). Maintained SC participation was associated with a higher likelihood of belonging to the decreasers from high PA (OR = 11.2, CI = 1.4-90.0) and to the combined group of increasers and activity maintainers (OR = 3.6, CI = 1.8-7.4); also with a lower likelihood of being an inactivity maintainer (OR = 0.1, CI = 0.02-0.2). Dropout from SC was related to a higher likelihood of being a decreaser from high PA (OR = 10.9, CI = 1.3-90.7). Maintenance/adoption of AC was associated with a lower likelihood of being an inactivity maintainer (OR = 0.3, CI = 0.1-0.7). Decreased SB was related to a higher likelihood of belonging to the activity maintainers and increasers (OR = 0.96, CI = 0.93-0.98). Conclusions PA patterns diverge greatly over the transition to adulthood. Changes in SC participation, AC, and SB show different associations with diverging PA patterns. Hence, tailored PA promotion is recommended. nonPeerReviewed

The symposium presents last findings on health promotion interventions in sports clubs. After a short introduction about the health promoting sports clubs (HPSC), five presentations (France, Sweden, Ireland, Finland and Netherlands) will reflect upon how sports clubs can be health promoting: in theory, from youth perspectives, by increasing physical activity level as outcome or enhancing sustainability of interventions, before opening the discussion with academic experts. Presentation 1 describes an iterative international process, implicating three groups (French sport students, French and Swedish experts) to create an intervention theory, based on the HPSC model. Presentation 2 focuses on a cross-sectional study investigating 123 Swedish youth's representation of sports clubs' role towards health promotion, identifying social dimension, environment, coaches, amount and ambition of practice as key factors. Presentation 3 is a longitudinal study among 366 adolescents, followed from age 15 to age 19, questioning the participation to organised sport practice and their orientation (leisure or competitive). Results have shown that by the age of 19, 33% of boys and 43% of girls have dropped out of organised sport, where 45% of boys and 26% of girls continued participation. Adolescents with a competitive goal orientation were more likely to continue participation. Presentation 4 is a longitudinal study among 131 youth measuring objective physical activity before and in the middle of a sport season. Principal results showed a significant change across time point, as well as differences between gender (a decrease in moderate to vigorous physical activity during games for boys and an increase for girls). Presentation 5 examined factors that influenced the sustainability of 14 Dutch sporting program aimed at increasing physical activity among inactive people 6.5 years after their implementation. Interviews with representatives of Dutch National Sports Federations and sports clubs helped to identify facilitating and impeding factors, like program adaptation, evaluation, financing and factors related to human resources. Question and Answer will be organised around the key ingredients and challenges facing the development of HPSC interventions, such as implementation of theoretical background, sport participants need consideration, complexity of outcomes evaluation of HPSC and program sustainability. nonPeerReviewed

Background Sports club participation begins to decrease in adolescence. There is a lack of knowledge, how sports club participation changes from adolescence to early adulthood in Finland, and how goal orientation influences on it. Therefore, the aim of this study is to examine if goal orientation is associated to changes in sports club participation during afore mentioned critical years. Methods The study design is longitudinal. A sample of 366 (140 boys, 226 girls) adolescents were followed from age 15 (year 2014) to age 19 (year 2018). Sports club participation (yes/no) and goal orientation (no competitive goal, sports for hobby or physical development/regional, national or international success in adolescence/national, international or professional success in adulthood) were measured using questionnaires. In order to study changes in sports club participation, and goal orientation, descriptive statistics were performed. Gender differences were estimated using Chi-squared tests. A binary logistic regression analysis was carried out to examine the association between sports club participation, goal orientation and gender. Results By the age 19, 33% of boys and 43% of girls had dropped out from sports club, 45% of boys and 26% of girls had continued participation, and 21% of boys and 31% of girls never participated (p > 0.01). More boys (57%) than girls (31%) had a success in adulthood as a goal, and more girls (48%) than boys (27%) had a success in adolescence as a goal (p > 0.001). Adolescents with success in adulthood as a goal continued participation in sports club more likely than adolescents without competitive goal (OR = 4.81; 95% CI 2.26-10.23). Furthermore, boys were more likely to continue participation than girls (OR = 1.75; 95% CI 1.02-3.01). Conclusions The dropout from sports club activities from adolescence to early adulthood is obvious. Especially the adolescents without a competitive goal and girls are in danger to drop out. This indicates that contemporary forms of sports club activities support adolescents with strong competitive orientation. Therefore, there is a need for sports clubs to develop activities suitable for adolescents with less competitive orientation to ensure their continuous participation in sports club. nonPeerReviewed