O065 The impact of breaking up sitting on vigilant attention during the workday when sleep restricted

Abstract Introduction Sleep restriction is associated with impairments to cognitive performance. A current strategy improve performance at work breaking up prolonged sitting light-intensity walking. However, it unknown whether this can counteract the impact of sleep restriction. This study investigated effect on under conditions Method 84 healthy adults (age M± SD 23.1±4.5 years; 41 females) participated in a 7-day laboratory study, 5 simulated workdays (0900-1700). Participants were randomly allocated condition: Breaking and 9-h (Break9; n=20), 5h (Break5; Sedentary (Sit9; n=22), 5-h (Sit5; n=22). opportunity prior each workday was (2200-0700) or (0200-0700) depending condition. Every 30-min during participants completed 3-min bouts walking, while sedentary remained sitting. At 0900, 1100, 1300, 1500, 1700, 10-min Psychomotor Vigilance Task Karolinska Sleepiness Scale. Results Mixed model ANOVAs revealed no significant 2-way 3-way interactions between condition (Break9, Break5, Sit9 Sit5), time day, for vigilant attention (reciprocal mean response lapses) subjective sleepiness. Discussion walking did Higher doses physical activity may be needed effects Findings highlight acute deficits inadequate sleep.