Assessment of energy expenditure for physical activity using a triaxial accelerometer

C.V.C. Bouten*, K.R. Westerterp, M. Verduin, J.D. Janssen

*Corresponding author for this work

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Assessment of energy expenditure for physical activity using a triaxial accelerometer.

Bouten CV, Westerterp KR, Verduin M, Janssen JD.

Faculty of Mechanical Engineering, Division of Fundamentals, Eindhoven University of Technology, The Netherlands.

A triaxial accelerometer was used to evaluate the relationship between energy expenditure due to physical activity (EEact) and body acceleration during different types of activity. In a laboratory experiment, 11 male subjects performed sedentary activities and walked on a motor driven treadmill (3-7 km.h-1). EEact was calculated from total energy expenditure (EEtot), as measured by indirect calorimetry, and sleeping metabolic rate (SMR): EEact = EEtot--SMR. Body accelerations were measured with a triaxial accelerometer at the low back. Special attention was paid to the analysis of unidirectional and three-directional accelerometer output. During sedentary activities a linear relationship between EEact and the sum of the integrals of the absolute value of accelerometer output from all three measurement directions (IAAtot) was found (r = 0.82, P < 0.001, Sy,x = 0.22 During walking EEact was highly correlated with the integral of absolute accelerometer output in antero-posterior direction (IAAx; r = 0.96, P < 0.001, Sy,x = 0.53 When all examined activities were included in a regression analysis, a strong linear relationship between EEact and IAAtot was found (r = 0.95, P < 0.001, Sy,x = 0.70 Using this relationship, EEact during sedentary activities as well as EEact during walking could be estimated with an accuracy of about 15%. Although sedentary activities and walking represent a large part of normal daily physical activity, the validity and usefulness of the triaxial accelerometer--measuring IAAtot--to predict EEact in daily life must be studied under free-living conditions
Original languageEnglish
Pages (from-to)1516-1523
JournalMedicine and Science in Sports and Exercise
Issue number12
Publication statusPublished - 1 Jan 1994

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