Prolonged sedentary time adversely relates to physical activity and obesity among preoperative bariatric surgery patients.

•Patients spent nearly 1/3 of their total sedentary time (ST) in ≥ 30-minute ST bouts•More prolonged ST independently related to less light physical activity (PA)•More prolonged ST predicted lower likelihood of meeting the national PA guideline•Patients with high levels of prolonged ST on average had more severe obesity