Document Detail

The use of uniaxial accelerometry for the assessment of physical-activity-related energy expenditure: a validation study against whole-body indirect calorimetry.
MedLine Citation:
PMID:  14756909     Owner:  NLM     Status:  MEDLINE    
Assessing the total energy expenditure (TEE) and the levels of physical activity in free-living conditions with non-invasive techniques remains a challenge. The purpose of the present study was to investigate the accuracy of a new uniaxial accelerometer for assessing TEE and physical-activity-related energy expenditure (PAEE) over a 24 h period in a respiratory chamber, and to establish activity levels based on the accelerometry ranges corresponding to the operationally defined metabolic equivalent (MET) categories. In study 1, measurement of the 24 h energy expenditure of seventy-nine Japanese subjects (40 (SD 12) years old) was performed in a large respiratory chamber. During the measurements, the subjects wore a uniaxial accelerometer (Lifecorder; Suzuken Co. Ltd, Nagoya, Japan) on their belt. Two moderate walking exercises of 30 min each were performed on a horizontal treadmill. In study 2, ten male subjects walked at six different speeds and ran at three different speeds on a treadmill for 4 min, with the same accelerometer. O2 consumption was measured during the last minute of each stage and was expressed in MET. The measured TEE was 8447 (SD 1337) kJ/d. The accelerometer significantly underestimated TEE and PAEE (91.9 (SD 5.4) and 92.7 (SD 17.8) % chamber value respectively); however, there was a significant correlation between the two values (r 0.928 and 0.564 respectively; P<0.001). There was a strong correlation between the activity levels and the measured MET while walking (r(2) 0.93; P<0.001). Although TEE and PAEE were systematically underestimated during the 24 h period, the accelerometer assessed energy expenditure well during both the exercise period and the non-structured activities. Individual calibration factors may help to improve the accuracy of TEE estimation, but the average calibration factor for the group is probably sufficient for epidemiological research. This method is also important for assessing the diurnal profile of physical activity.
Hideaki Kumahara; Yves Schutz; Makoto Ayabe; Mayumi Yoshioka; Yutaka Yoshitake; Munehiro Shindo; Kojiro Ishii; Hiroaki Tanaka
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Validation Studies    
Journal Detail:
Title:  The British journal of nutrition     Volume:  91     ISSN:  0007-1145     ISO Abbreviation:  Br. J. Nutr.     Publication Date:  2004 Feb 
Date Detail:
Created Date:  2004-02-03     Completed Date:  2004-03-15     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0372547     Medline TA:  Br J Nutr     Country:  England    
Other Details:
Languages:  eng     Pagination:  235-43     Citation Subset:  IM    
Laboratory of Physiology, Faculty of Medicine, University of Lausanne, Lausanne, Switzerland.
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MeSH Terms
Analysis of Variance
Calorimetry, Indirect
Energy Metabolism / physiology*
Environment, Controlled
Exercise / physiology*
Exercise Test / methods
Middle Aged
Monitoring, Physiologic / methods
Reproducibility of Results

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