Other activity states that comprise a 24-hour period for an average individual include sleep, light-intensity physical activity, and sedentary behavior (Figure 1). Sedentary behavior refers to waking behavior with an energy expenditure of 1.5 metabolic equivalents while in a sitting or reclining posture (Table 4).S3.2-30 Increased sedentary behavior is associated with worse health parameters, including cardiometabolic risk Sedentary behavior may be most deleterious to ASCVD risk for individu- als who engage in the least amount of moder- ate to vigorous physical activity.S3.2-3,S3.2-10,S3.2-12 Thus, strategies to reduce sedentary behavior, particularly in those not achieving current rec- ommended physical activity levels, may be ben- eficial for lowering ASCVD risk. However, data on the value of reducing or modifying sedentary behavior over time to reduce ASCVD risk are sparse, and whether replacing sedentary behav- ior with light-intensity activity (eg, slow walking, light work) is beneficial for ASCVD prevention is The strength and specificity of the recommendation to reduce sedentary behavior are limited by uncertainty about the appropriate limits of and optimal approach to modifying sed- Figure 1. Hours per day spent in various states of activity. US adults spend >7 h/d on average in sedentary activities. Replacing sedentary time with other physical activity involves increasing either moderate- to vigorous-intensity physical activity or light-intensity physical activity. Data modified from Young et al.S3.2-30 Table 4. 