Influence of upper extremity position on EMG signal measures calculated in time, frequency and time-frequency domains.
The aim of this study was to investigate the relationship between time-frequency, time and frequency measures when considering various upper extremity positions below the level of the shoulder and in trapezius as well as deltoideus muscles. During the experiment, 15 subjects performed a task that involved screwing and unscrewing a screw cap on a board in six different locations, i.e., there were six upper extremity positions. Variables were calculated in the time, frequency and time-frequency domains on a recorded EMG signal. The results showed that parameters analyzed in the time-frequency domain were more sensitive to changes in position than parameters analyzed in the frequency domain.
Faculty of Power and Aeronautical Engineering, Warsaw University of Technology, Warsaw, Poland.
Jikun
J
Wang
Laboratory of Biomechanics, Department of Ergonomics, Central Institute for Labour Protection - National Research Institute (CIOP-PIB), Warsaw, Poland.
Paweł
P
Bartuzi
Laboratory of Biomechanics, Department of Ergonomics, Central Institute for Labour Protection - National Research Institute (CIOP-PIB), Warsaw, Poland.
Danuta
D
Roman-Liu
D000704:Analysis of Variance; D001696:Biomechanical Phenomena; D004576:Electromyography; D006801:Humans; D008297:Male; D012782:Shoulder / Q000502:physiology*; D012815:Signal Processing, Computer-Assisted; D013997:Time Factors; D055815:Young Adult