A COMPARISON OF DIRECTLY RECORDED AND DERIVED ACCELERATION DATA IN MOVEMENT CONTROL RESEARCH

This paper compares acceleration-time histories that were recorded during a simple arm extension/flexion movement completed as fast as possible and at a slower rate. Directly measured accelerations from an accelerometer were used to obtain an optimum filter cut-off frequency for displacement data that were to be subsequently differentiated. Dependent variables such as 'zero line crossings' and 'significant deviations' were measured using both the accelerometer data and the derived acceleration data.