Background
Adolescent girls experience higher rates of physical inactivity and affective disorders compared to their male peers. Yet, few studies have used intensive longitudinal methods to explore relations between physical activity and affect in the context of daily life in this population. Further, most research investigating within-person relations between physical activity and affect have not differentiated between levels of activation in positive or negative affect constructs.
Methods
Adolescent girls (n = 66, 12–18 years) completed a 28-day daily diary study. Each evening, girls reported their moderate to vigorous physical activity (MVPA) and affect for that day. Daily composite scores for positive activated and deactivated affect as well as negative activated and deactivated affect were created. Multilevel models regressed daily affect on between- and within-person MVPA, controlling for the previous day's affect.
Results
At the within-person level, on days when girls engaged in more MVPA than was typical for them, they reported an increase in positive activated affect (B = 0.13, p < 0.01), and negative deactivated affect (B = 0.02, p = 0.04), but a decrease in positive deactivated affect (B = −0.02, p = 0.02) on those days. At the between-person level, girls who tended to engage in more MVPA overall, reported more positive activated affect (B = 0.04, p = 0.04).
Conclusion
Accounting for activation in conceptualizations of affect reveals nuances in associations between daily physical activity and affect among adolescent girls. Future research should examine these processes within and across days to better understand acute relations between physical activity and affect in diverse adolescent girls.
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