Kinetic and Kinematic Comparison of Sit-To-Stand Movement between Healthy Young and Elderly Subjects

Kim, Du Hwan; Park, Sung Min; Jeon, Doyoung; Sung, Duk Hyun

Abstract

OBJECTIVE
The purpose of this study was to compare the kinematic and kinetic parameters in sit-to-stand (STS) movement between healthy elderly and young people. METHOD: We measured the maximal isometric hip and knee extension moment of the ten healthy young volunteers and ten elderly and analyzed the STS movement using a motion analyzer. The differences of temporal, kinematic, and kinetic variables between young and elderly were assessed.
RESULTS
The maximal knee isometric moment of elderly was lower than that of young. There were no differences in total duration and the range of motion of hip and knee during STS movement between young and elderly. Comparing the kinetic variables normalized by maximal isometric extension moment, maximal knee extension moment and knee work were significantly higher in elderly. There were no differences in maximal knee power and kinetic variables of hip between young and elderly.
CONCLUSION
It was the marked difference of STS movement between young and elderly that maximal knee extension moment normalized by maximal isometric extension moment was higher in elderly. It was reasonable that this difference was due to the difference of maximal knee isometric torque.