Accelerometer Accuracy : Assessing Energy Expenditure

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Accelerometer Accuracy in Assessing Energy Expenditure Introduction/Background: The use of accelerometers and pedometers are highly associated with increases in the amount of physical activity that is performed by an individual. Setting a step goal ranging from 2,000-10,000 steps, depending on the individual, seems to be a motivational factor for increasing the amount of daily physical activity (Bravata, Smith-Spangler, Sundararm, Gienger et. al., 2007). Those individuals who work in a white collar job setting may be unaware of the lack of physical activity being performed daily due to their job environment. Accelerometers and pedometers help gage the amount of physical activity that is being performed, whether it is walking through …show more content…

It is important to determine whether or not these accelerometers are measuring exactly what they are claiming to measure in a correct manner. It is also important for consumers and for professional personnel to be knowledgeable about the activity monitors they are purchasing. These accelerometers will be tested against a portable metabolic analyzer (COSMED) that will be worn for the duration of the body weight resistance training. By utilizing the portable metabolic analyzer in this study, we will be able to analyze the validity of the accelerometers based on actual exercises and various movements instead of just counting steps while walking, compared to the energy expenditure calculations of the portable metabolic analyzer. Accelerometers and pedometers can measure steps and energy expenditure easily based upon movement from one spot to another. For agility drills such as shuffling, pivoting, and anything involving quick steps, accelerometers seemed to underestimate the energy expenditure. This is likely due to various, complex movements that are being performed while completing the agility exercises. Small, quick steps may not be registering with the accelerometers and therefore underestimating the energy expenditure. There is typically less major arm movement involved in exercises involving quick steps, which then effects the accuracy of the accelerometers worn on the wrist and arm (Stackpool, 2013). When subjects wore a portable metabolic

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