Recruitment difficulties

Short term morbidity after elective cardiac surgery remains significant. Standard predictive models, considering simple patient demographics and clinical parameters, show limited efficiency in individual operative risk assessment. There is growing evidence about daily physical activity as a relevant indicator of preoperative "frailty". Although cardiopulmonary exercise testing remains a gold standard, we are looking for more simple tools in order to identify patients with poor physical condition. Accelerometry may be an objective and reproductible method to measure physical activity at patient's home.

The aim of this study is to compare accelerometer-assessed preoperative physical activity between two groups of patients with different postoperative length of stay following elective cardiac surgery. In the future, accelerometry could be used to identify patients that may benefit from prehabilitation programs including exercise therapy before elective cardiac surgery.

Inclusion Criteria:

• Adult subject (≥ 60 years) awaiting elective cardiac surgery
• Patients affiliated or entitled to a social security scheme
• Patients who have received information about the study and have given their oral consent to participate

Exclusion Criteria:

• Pregnant woman,
• Major limitations in physical activity for orthopedic or musculoskeletal reasons
• Patients under judicial protection (curator or guardianship)

Adult subject (≥ 60 years) awaiting elective cardiac surgery will be included.