Feng 2019.

Study name	The effects of stage I cardiac rehabilitation on cardiopulmonary function in patients undergoing open heart surgery: a randomized controlled study.
Methods	Randomised parallel controlled trial
Participants	Adults after open heart surgery
Interventions	General exercise rehabilitation group: general exercise rehabilitation  Intensive exercise rehabilitation group: intensive exercise rehabilitation
Outcomes	Primary PVO2 Secondary Peak cardiac output Resting cardiac output Cardiac NYHA grading Echocardiography
Starting date	1 July 2017
Contact information	29611290@qq.com; liubomiao424@sina.cn
Notes	Estimated enrolment: general exercise rehabilitation group: 60; intensive exercise rehabilitation group: 60 Estimated study finish date: 31 March 2020 Location: Fuwai Hospital; Chinese Academy of Medical Sciences, Beijing, China