Sedentary behavior is an independent factor affecting the mortality rate of patients with chronic obstructive pulmonary disease (COPD), but currently healthcare professionals do not pay enough attention to sedentary behavior. This paper is based on current research and mainly explores the harm of sedentary behavior to COPD patients, the ways of digital health technology intervention, problems, and suggestions. The aim is to improve the awareness of healthcare professionals and COPD patients about the harm of sedentary behavior, reduce patients' sedentary behavior, and provide reference for improving patients' quality of life and disease prognosis.

Sedentary behavior is an independent factor affecting the mortality rate of patients with chronic obstructive pulmonary disease (COPD), but currently healthcare professionals do not pay enough attention to sedentary behavior. This paper is based on current research and mainly explores the harm of sedentary behavior to COPD patients, the ways of digital health technology intervention, problems, and suggestions. The aim is to improve the awareness of healthcare professionals and COPD patients about the harm of sedentary behavior, reduce patients' sedentary behavior, and provide reference for improving patients' quality of life and disease prognosis.

Objective To evaluate the results of rotary self-locking intramedullary nail (RSIN) for treating long tubular bone fracture of extremities, and discuss the current problems. Methods One hundred and twenty-two patients with long tubular bone fracture of extremities,including 59 femoral fractures,57 tibial fractures and 6 humeral fractures,who had been treated by RSIN were retrospectively investigated. Results All of the patients achieved clin-ical healing,with an average time of 24 weeks. Nobody was found to appear maluniun,infection and the break of inter-nal fixture. Internal fixations were removed after the fracture healing,with an average time of 14 months. It was diffi-cult to remove the internal fixations in 5 cases, and one case refractured after removing the internal fixations. Conclu-sion RSIN has the advantages such as easy operation,less trauma,no pendulum effect,early motion after operation and so on, except the characters of general interlocking intramedullary nail such as anti-rotation, anti-crispition and anti-displacement.