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Motor Activity and Behavioral Assessment

Description of the Strategy

Actigraphy is the term used to describe the instrumented measurement of activity level. Older actigraphs used a sensor that identified presence of movement above a designated threshold and accumulated frequency counts to computer memory locations at the end of specified epochs, such as 1, 5, 10, 15, or 30 minutes, depending upon the device. Newer actigraphs use an accelerometer to detect small changes in the rate of movement. Our limbs are jointed and therefore move in arcs. These curved movements are associated with continuous changes in acceleration. Modern actigraphs frequently discern at least 255 levels of acceleration. They either digitize and then integrate these acceleration measurements or integrate the analog output of accelerometers before storing the result in memory ...

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