Document Detail

A triaxial accelerometer and portable data processing unit for the assessment of daily physical activity.
MedLine Citation:
PMID:  9216127     Owner:  NLM     Status:  MEDLINE    
The present study describes the development of a triaxial accelerometer (TA) and a portable data processing unit for the assessment of daily physical activity. The TA is composed of three orthogonally mounted uniaxial piezoresistive accelerometers and can be used to register accelerations covering the amplitude and frequency ranges of human body acceleration. Interinstrument and test-retest experiments showed that the offset and the sensitivity of the TA were equal for each measurement direction and remained constant on two measurement days. Transverse sensitivity was significantly different for each measurement direction, but did not influence accelerometer output (< 3% of the sensitivity along the main axis). The data unit enables the on-line processing of accelerometer output to a reliable estimator of physical activity over eight-day periods. Preliminary evaluation of the system in 13 male subjects during standardized activities in the laboratory demonstrated a significant relationship between accelerometer output and energy expenditure due to physical activity, the standard reference for physical activity (r = 0.89). Shortcomings of the system are its low sensitivity to sedentary activities and the inability to register static exercise. The validity of the system for the assessment of normal daily physical activity and specific activities outside the laboratory should be studied in free-living subjects.
C V Bouten; K T Koekkoek; M Verduin; R Kodde; J D Janssen
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  IEEE transactions on bio-medical engineering     Volume:  44     ISSN:  0018-9294     ISO Abbreviation:  IEEE Trans Biomed Eng     Publication Date:  1997 Mar 
Date Detail:
Created Date:  1997-08-19     Completed Date:  1997-08-19     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0012737     Medline TA:  IEEE Trans Biomed Eng     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  136-47     Citation Subset:  IM    
University of Technology, Division of Computational and Experimental Mechanics, Eindhoven, The Netherlands.
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MeSH Terms
Activities of Daily Living
Automatic Data Processing
Energy Metabolism / physiology*
Equipment Design
Evaluation Studies as Topic
Exercise / physiology*
Monitoring, Physiologic / instrumentation
Movement / physiology
Posture / physiology
Sensitivity and Specificity

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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