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Assessment of energy expenditure for physical activity using a triaxial accelerometer

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BOUTEN, CARLIJN V., WESTERTERP, KLAAS R., VERDUIN, MAARTEN, JANSSEN, JAN D.·1994·Medicine & Science in Sports & Exercise

Abstract

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 W.kg-1). 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 W.kg-1). 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 W.kg-1). 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.

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Crossref · 10.1249/00005768-199412000-00016

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Authors
BOUTEN, C. V., WESTERTERP, K. R., VERDUIN, M., & JANSSEN, J. D.
Venue
Medicine & Science in Sports & Exercise
Published
1994-12
Volume
26
Issue
12
Pages
1516???1523
ISSN
0195-9131 (ISSN-L)
OpenAlex
W1967571053
Cited by
451
References
0
FWCI
3.63
Type
journal article
Language
en
Open access
green

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