The convergent effects of primary school physical activity, sleep, and recreational screen time on cognition and academic performance in grade 9.

Lab-based experiments and randomized controlled trials consistently demonstrate improvements in youth cognition following physical activity (PA), while cross-sectional studies suggest that sedentary behavior (especially recreational screen time [RST]) and poor sleep are inversely related to cognition. However, little is known about how these 24-h movement behaviors-sleep, PA, and sedentary behavior-converge to affect youth cognition. Therefore, the purpose of this study is to test the associations between childhood 24-h movement behaviors and adolescent cognition using a longitudinal design and examine moderating effects of each behavior.

The S.P.A.C.E Hypothesis: Physical Activity as Medium - Not Medicine - for Public Health Impact.

Most scientifically tested physical activity interventions end when research funding ends; interventions that last struggle to sustain benefits. We hypothesize that long-term public health impact will benefit from a shift in how interventionists conceptualize physical activity - from a form of medicine, of value for its innate health benefits, to a malleable medium, of value for the dynamic contexts it creates.