EMG analysis of back muscles during various types of sitting position

Title: EMG Analysis of Back Muscles during various Types of Sitting Position Purposes: The purpose of the thesis is the assessment of EMG activity of back muscles while sitting on a chair without any back support, and while sitting on a gymball. Methods: Surface electromyography - recording EMG activity of back muscles (20 minutes sitting on a chair and 20 minutes sitting on a gymball). Results: The mean muscle activity of all probands while sitting on a chair is higher than while sitting on a gymball. Muscle fatigue of back muscles occurs faster when sitting on a gymball than when sitting on a chair. Key words: sitting position, gymball, surface electromyography, back muscle