Momentary associations between sedentary bouts, cognitive load and mood in daily life: An ambulatory assessment study

Empirical evidence points to sedentary behavior as a ubiquitous health-related risk factor. Given the increasing number of mental disorders, a growing body of studies now focuses on the relationship between sedentary behavior and mental health. However, momentary interactions between sedentary bouts, mood, and type of cognitive load in daily life are highly understudied. To investigate whether sedentary bouts influence mood, we conducted an Ambulatory Assessment study in the everyday life of 103 university students over 5 days. We continuously measured sedentary behavior via accelerometers and assessed mood and type of cognitive load up to six times each day on smartphone diaries. We employed multilevel modeling to analyze the within-person effects of sedentary behavior, and cognitive load on mood. Sedentary bouts (20-min intervals prior to each e-diary assessment) negatively influenced energetic arousal (p < 0.001) and valence (p = 0.023). Cognitive load (mentally active vs. mentally passive) influenced negatively energetic arousal (p < 0.001) and positively calmness (p = 0.031). Exploratory interaction analyses revealed significant differences between cognitive load and bouts of SB (interrupted vs. uninterrupted). The negative association between sedentary behavior and two of three mood dimensions (i.e., valence and energetic arousal) suggests sedentary behavior is an important risk factor for mental health among healthy young adults. Additionally, the cognitive load, specifically the distinction between mentally active and mentally passive activities, is an important factor in shaping momentary mood. We strongly recommend reducing prolonged SB and recognizing the potential benefits of engaging in mentally active activities.