摘要：In order to analyze the condition of sudden knee bending, the changes in knee angle andmuscle activity of knee extensors were examined by using 8 healthy subjects.The bjects were ordered to stand on one leg, bend a knee, and stop bending motion as involuntarily as possible. We were found to show almost the same period from the initiation to the completion of knee bending (422±4.2 msec) and the same knee angle at the completion (58±5.4°). It was also found that the knee angle at the completion of knee bending coincided with that at which knee extensor can be strongest and work most actively. The motion to stop bending appeared 150 msec after the initiation of knee bending at the knee angle of over 30° (angular velocity, approximately 280 DPS). At that time, knee extensor revealed relatively higher torque value which suggests that the muscle may be in optimum condition for stopping bending.
关键词：knee bending; fall; three dimensional co-ordinates measurement system
