24-hour movement behaviors of physical activity, screen time, and sleep in youth with down syndrome compared to typically developing peers

• Limited research exists on studies that examine physical activity, sleep, and screen time concurrently for youth with DS. • Youth with DS tend to not achieve all 3 recommended 24-h guidelines for physical activity, sleep, and screen time. • This study compared physical activity, sleep, and sedentary behaviors for youth with DS to a group with typical development. • Findings suggest the need to assess all 3 behaviors concurrently to best understand and modify behaviors in youth with DS. • Assessing behaviors concurrently in a 24-h period can inform how youth with DS engage in activity & intervention strategies.