Chair Kinematics, A Novel Criteria for Frailty Status Classification

A quarter to a half of people over 85 years are estimated to be frail by 2050. There is an urge to tackle this syndrome to assess the risk for an elderly to become frail. Performance tests such as the 30-s chair stand test (30-s CST) are a cornerstone for detecting early decline. Predictions are based on the number of repetitions instead of how they are performed. Latest advances show that kinematics from chair-related transitions are able to track frailty status. Here, the most interesting parameters for the 30-s CST extracted from the literature are presented. A classification tree was used to assess which ones identify better frailty. Finally, this study provides a set of four parameters to classify a subject regarding the frailty status more accurately than the current 30-s CST outcome. This novel information could help clinicians to undertake the corresponding actions to prevent this syndrome.