Daily physical activity assessment: comparison between movement
registration and doubly labeled water.
Bouten, Carlijn V. C., Wilhelmine P. H. G. Verboeket-Van De Venne,
Klaas R. Westerterp, Maarten Verduin, and Jan D. Janssen.
Department of Human Biology, University of Limburg, 6200 MD
Maastricht, and Faculty of Mechanical Engineering, Eindhoven
University of Technology, 5600 MB Eindhoven, The Netherlands
APStracts 3:0146A, 1996.
The use of movement registration for daily physical activity
assessment was evaluated during a 7-day period in 30 free-living
subjects. Body movement was registered with a Tracmor motion sensor,
consisting of a triaxial accelerometer and a data unit for on-line
processing of accelerometer output over 1 min intervals. Average
Tracmor output was correlated against four different energy
estimates: 1) average daily metabolic rate (ADMR), determined with
doubly labeled water, 2) ADMR minus sleeping metabolic rate (SMR,
determined in a respiration chamber), 3) (ADMR_SMR) per kg body mass,
and 4) the overall physical activity level (PAL = ADMR/SMR). The
highest correlation was found for the relationship between Tracmor
output and PAL (r = 0.58). After correction for Tracmor values
arising from vibrations produced by transportation means, this
correlation was improved to 0.73. There was no difference between
Tracmor output and PAL in discriminating between overall activity
levels with 'low' (PAL < 1.60), 'moderate' (1.60
Received 21 June 1995; accepted in final form 20 February 1996.
APS Manuscript Number A658-5.
Article publication pending Journal of Applied Physiology.
ISSN 1080-4757 Copyright 1996 The American Physiological Society.
Published in APStracts on 27 March 96