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Background.   Physical activity is important for multiple aspects of health, for example, cancer prevention, metabolic disease treatment, cardiovascular health, and obesity management. Despite the improved capability of measuring physical activity in the research arena, the options are scarce and less reliable for measurements in free-living people. In this article, the authors tested the validity of a robust stand-alone patient-operated Accelerometer System that can measure physical activity and sedentariness in active people.Methods.   Thirty subjects wore the Accelerometer System along with the validated physical activity monitoring system (PAMS) with different body postures and during graded walking at 7 velocities. Energy expenditure was measured using indirect calorimetry.Results.   In all the 30 subjects, the Accelerometer System distinguished sedentary and walking activity reliably even with ½ mph increments in walking and was accurate and precise compared with PAMS, with an intraclass correlation coefficient ( r 2  &gt; .98). The Accelerometer System showed excellent sequential increases with increase in walking velocity and energy expenditure ( r 2  &gt; .9).Conclusion.   A stand-alone Accelerometer System was accurate and reliable in measuring and quantifying physical activity in the laboratory setting.

A Stand-Alone Accelerometer System for Free-Living Individuals to Measure and Promote Physical Activity