Reliability of computer-based video motion analysis and electromyographic analysis of sit-to-stand movement

Abstract

We examined the test-retest reliability of computer-based video motion analysis and electromyographic (EMG) analysis of the sit-to-stand movement in 11 healthy subjects. The peak joint angles, joint angular velocities, and EMG activities were measured in two trials with five different chair heights. The intraclass correlation coefficient (ICC) was calculated to determine the reliability of the data. The peak joint angles of trunk, hip, knee and ankle statistically increased with decreasing chair height. The ICC values of all joint angles were high or moderate. The peak angular velocities of hip and knee extension and ankle dorsi/plantarflexion increased with decreasing chair height. The ICC values of angular velocities were lower than the joint angles. The peak EMG activities of rectus femoris and tibialis anterior increased with decreasing chair height. The ICC of EMG activities values were high. We conclude that the results of this study are reliable, except for those of the joint angular velocities. The reliability of joint angular velocities may be influenced by variability of movement speed.